patch 8.2.4489: failing test for comparing v:null with number

Problem:    Failing test for comparing v:null with number.
Solution:   Allow comparing v:null with number in legacy script.
            (Ken Takata, closes #9873)  Also do this for float.

runtime/autoload/dist/ft.vim

@@ -3,7 +3,7 @@ vim9script
 # Vim functions for file type detection
 #
 # Maintainer:	Bram Moolenaar <Bram@vim.org>
-# Last Change:	2022 Feb 05
+# Last Change:	2022 Feb 22
 
 # These functions are moved here from runtime/filetype.vim to make startup
 # faster.

runtime/doc/Makefile

@@ -153,6 +153,7 @@ DOCS = \
 	version6.txt \
 	version7.txt \
 	version8.txt \
+	version9.txt \
 	vi_diff.txt \
 	vim9.txt \
 	visual.txt \
@@ -298,6 +299,7 @@ HTMLS = \
 	version6.html \
 	version7.html \
 	version8.html \
+	version9.html \
 	vi_diff.html \
 	vimindex.html \
 	vim9.html \

runtime/doc/autocmd.txt

@@ -1639,7 +1639,7 @@ Examples for reading and writing compressed files: >
   :  autocmd BufReadPre,FileReadPre	*.gz set bin
   :  autocmd BufReadPost,FileReadPost	*.gz '[,']!gunzip
   :  autocmd BufReadPost,FileReadPost	*.gz set nobin
-  :  autocmd BufReadPost,FileReadPost	*.gz execute ":doautocmd BufReadPost " . expand("%:r")
+  :  autocmd BufReadPost,FileReadPost	*.gz execute ":doautocmd BufReadPost " .. expand("%:r")
   :  autocmd BufWritePost,FileWritePost	*.gz !mv <afile> <afile>:r
   :  autocmd BufWritePost,FileWritePost	*.gz !gzip <afile>:r
 
@@ -1738,7 +1738,7 @@ To insert the current date and time in a *.html file when writing it: >
   :  else
   :    let l = line("$")
   :  endif
-  :  exe "1," . l . "g/Last modified: /s/Last modified: .*/Last modified: " .
+  :  exe "1," .. l .. "g/Last modified: /s/Last modified: .*/Last modified: " ..
   :  \ strftime("%Y %b %d")
   :endfun
 

runtime/doc/builtin.txt

@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 8.2.  Last change: 2022 Feb 18
+*builtin.txt*	For Vim version 8.2.  Last change: 2022 Feb 23
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -854,7 +854,7 @@ argv([{nr} [, {winid}]])
 	:let i = 0
 	:while i < argc()
 	:  let f = escape(fnameescape(argv(i)), '.')
-	:  exe 'amenu Arg.' . f . ' :e ' . f . '<CR>'
+	:  exe 'amenu Arg.' .. f .. ' :e ' .. f .. '<CR>'
 	:  let i = i + 1
 	:endwhile
 <		Without the {nr} argument, or when {nr} is -1, a |List| with
@@ -1134,7 +1134,7 @@ bufwinid({buf})						*bufwinid()*
 		see |bufname()| above.  If buffer {buf} doesn't exist or
 		there is no such window, -1 is returned.  Example: >
 
-	echo "A window containing buffer 1 is " . (bufwinid(1))
+	echo "A window containing buffer 1 is " .. (bufwinid(1))
 <
 		Only deals with the current tab page.
 
@@ -1147,7 +1147,7 @@ bufwinnr({buf})						*bufwinnr()*
 		If buffer {buf} doesn't exist or there is no such window, -1
 		is returned.  Example: >
 
-	echo "A window containing buffer 1 is " . (bufwinnr(1))
+	echo "A window containing buffer 1 is " .. (bufwinnr(1))
 
 <		The number can be used with |CTRL-W_w| and ":wincmd w"
 		|:wincmd|.
@@ -1197,7 +1197,7 @@ byteidx({expr}, {nr})					*byteidx()*
 byteidxcomp({expr}, {nr})					*byteidxcomp()*
 		Like byteidx(), except that a composing character is counted
 		as a separate character.  Example: >
-			let s = 'e' . nr2char(0x301)
+			let s = 'e' .. nr2char(0x301)
 			echo byteidx(s, 1)
 			echo byteidxcomp(s, 1)
 			echo byteidxcomp(s, 2)
@@ -1392,7 +1392,7 @@ col({expr})	The result is a Number, which is the byte index of the column
 			col(".")		column of cursor
 			col("$")		length of cursor line plus one
 			col("'t")		column of mark t
-			col("'" . markname)	column of mark markname
+			col("'" .. markname)	column of mark markname
 <		The first column is 1.  0 is returned for an error.
 		For an uppercase mark the column may actually be in another
 		buffer.
@@ -1401,7 +1401,7 @@ col({expr})	The result is a Number, which is the byte index of the column
 		line.  This can be used to obtain the column in Insert mode: >
 			:imap <F2> <C-O>:let save_ve = &ve<CR>
 				\<C-O>:set ve=all<CR>
-				\<C-O>:echo col(".") . "\n" <Bar>
+				\<C-O>:echo col(".") .. "\n" <Bar>
 				\let &ve = save_ve<CR>
 
 <		Can also be used as a |method|: >
@@ -2247,12 +2247,12 @@ expand({string} [, {nosuf} [, {list}]])				*expand()*
 			:e		extension only
 
 		Example: >
-			:let &tags = expand("%:p:h") . "/tags"
+			:let &tags = expand("%:p:h") .. "/tags"
 <		Note that when expanding a string that starts with '%', '#' or
 		'<', any following text is ignored.  This does NOT work: >
 			:let doesntwork = expand("%:h.bak")
 <		Use this: >
-			:let doeswork = expand("%:h") . ".bak"
+			:let doeswork = expand("%:h") .. ".bak"
 <		Also note that expanding "<cfile>" and others only returns the
 		referenced file name without further expansion.  If "<cfile>"
 		is "~/.cshrc", you need to do another expand() to have the
@@ -2633,7 +2633,7 @@ fnameescape({string})					*fnameescape()*
 		and |:write|).  And a "-" by itself (special after |:cd|).
 		Example: >
 			:let fname = '+some str%nge|name'
-			:exe "edit " . fnameescape(fname)
+			:exe "edit " .. fnameescape(fname)
 <		results in executing: >
 			edit \+some\ str\%nge\|name
 <
@@ -2814,7 +2814,7 @@ function({name} [, {arglist}] [, {dict}])
 <		The Dictionary is only useful when calling a "dict" function.
 		In that case the {dict} is passed in as "self". Example: >
 			function Callback() dict
-			   echo "called for " . self.name
+			   echo "called for " .. self.name
 			endfunction
 			...
 			let context = {"name": "example"}
@@ -3013,7 +3013,7 @@ getbufvar({buf}, {varname} [, {def}])				*getbufvar()*
 		string is returned, there is no error message.
 		Examples: >
 			:let bufmodified = getbufvar(1, "&mod")
-			:echo "todo myvar = " . getbufvar("todo", "myvar")
+			:echo "todo myvar = " .. getbufvar("todo", "myvar")
 
 <		Can also be used as a |method|: >
 			GetBufnr()->getbufvar(varname)
@@ -3074,9 +3074,9 @@ getchar([expr])						*getchar()*
 		This example positions the mouse as it would normally happen: >
 			let c = getchar()
 			if c == "\<LeftMouse>" && v:mouse_win > 0
-			  exe v:mouse_win . "wincmd w"
+			  exe v:mouse_win .. "wincmd w"
 			  exe v:mouse_lnum
-			  exe "normal " . v:mouse_col . "|"
+			  exe "normal " .. v:mouse_col .. "|"
 			endif
 <
 		When using bracketed paste only the first character is
@@ -3873,7 +3873,7 @@ gettabwinvar({tabnr}, {winnr}, {varname} [, {def}])		*gettabwinvar()*
 		empty string is returned, there is no error message.
 		Examples: >
 			:let list_is_on = gettabwinvar(1, 2, '&list')
-			:echo "myvar = " . gettabwinvar(3, 1, 'myvar')
+			:echo "myvar = " .. gettabwinvar(3, 1, 'myvar')
 <
 		To obtain all window-local variables use: >
 			gettabwinvar({tabnr}, {winnr}, '&')
@@ -4006,7 +4006,7 @@ getwinvar({winnr}, {varname} [, {def}])				*getwinvar()*
 		Like |gettabwinvar()| for the current tabpage.
 		Examples: >
 			:let list_is_on = getwinvar(2, '&list')
-			:echo "myvar = " . getwinvar(1, 'myvar')
+			:echo "myvar = " .. getwinvar(1, 'myvar')
 
 <		Can also be used as a |method|: >
 			GetWinnr()->getwinvar(varname)
@@ -4261,7 +4261,7 @@ histdel({history} [, {item}])				*histdel()*
 		The following three are equivalent: >
 			:call histdel("search", histnr("search"))
 			:call histdel("search", -1)
-			:call histdel("search", '^'.histget("search", -1).'$')
+			:call histdel("search", '^' .. histget("search", -1) .. '$')
 <
 		To delete the last search pattern and use the last-but-one for
 		the "n" command and 'hlsearch': >
@@ -4280,7 +4280,7 @@ histget({history} [, {index}])				*histget()*
 
 		Examples:
 		Redo the second last search from history. >
-			:execute '/' . histget("search", -2)
+			:execute '/' .. histget("search", -2)
 
 <		Define an Ex command ":H {num}" that supports re-execution of
 		the {num}th entry from the output of |:history|. >
@@ -4526,7 +4526,7 @@ input({prompt} [, {text} [, {completion}]])		*input()*
 		|:execute| or |:normal|.
 
 		Example with a mapping: >
-			:nmap \x :call GetFoo()<CR>:exe "/" . Foo<CR>
+			:nmap \x :call GetFoo()<CR>:exe "/" .. Foo<CR>
 			:function GetFoo()
 			:  call inputsave()
 			:  let g:Foo = input("enter search pattern: ")
@@ -4700,7 +4700,7 @@ items({dict})						*items()*
 		order.  Also see |keys()| and |values()|.
 		Example: >
 			for [key, value] in items(mydict)
-			   echo key . ': ' . value
+			   echo key .. ': ' .. value
 			endfor
 
 <		Can also be used as a |method|: >
@@ -4715,7 +4715,7 @@ join({list} [, {sep}])					*join()*
 		{sep} is omitted a single space is used.
 		Note that {sep} is not added at the end.  You might want to
 		add it there too: >
-			let lines = join(mylist, "\n") . "\n"
+			let lines = join(mylist, "\n") .. "\n"
 <		String items are used as-is.  |Lists| and |Dictionaries| are
 		converted into a string like with |string()|.
 		The opposite function is |split()|.
@@ -4927,7 +4927,7 @@ line({expr} [, {winid}])				*line()*
 			line(".")		line number of the cursor
 			line(".", winid)	idem, in window "winid"
 			line("'t")		line number of mark t
-			line("'" . marker)	line number of mark marker
+			line("'" .. marker)	line number of mark marker
 <
 		To jump to the last known position when opening a file see
 		|last-position-jump|.
@@ -5161,7 +5161,7 @@ map({expr1}, {expr2})					*map()*
 		current byte. For a |String| |v:key| has the index of the
 		current character.
 		Example: >
-			:call map(mylist, '"> " . v:val . " <"')
+			:call map(mylist, '"> " .. v:val .. " <"')
 <		This puts "> " before and " <" after each item in "mylist".
 
 		Note that {expr2} is the result of an expression and is then
@@ -5175,19 +5175,19 @@ map({expr1}, {expr2})					*map()*
 		The function must return the new value of the item. Example
 		that changes each value by "key-value": >
 			func KeyValue(key, val)
-			  return a:key . '-' . a:val
+			  return a:key .. '-' .. a:val
 			endfunc
 			call map(myDict, function('KeyValue'))
 <		It is shorter when using a |lambda|: >
-			call map(myDict, {key, val -> key . '-' . val})
+			call map(myDict, {key, val -> key .. '-' .. val})
 <		If you do not use "val" you can leave it out: >
-			call map(myDict, {key -> 'item: ' . key})
+			call map(myDict, {key -> 'item: ' .. key})
 <		If you do not use "key" you can use a short name: >
-			call map(myDict, {_, val -> 'item: ' . val})
+			call map(myDict, {_, val -> 'item: ' .. val})
 <
 		The operation is done in-place for a |List| and |Dictionary|.
 		If you want it to remain unmodified make a copy first: >
-			:let tlist = map(copy(mylist), ' v:val . "\t"')
+			:let tlist = map(copy(mylist), ' v:val .. "\t"')
 
 <		Returns {expr1}, the |List| or |Dictionary| that was filtered,
 		or a new |Blob| or |String|.
@@ -5263,7 +5263,7 @@ maparg({name} [, {mode} [, {abbr} [, {dict}]]])			*maparg()*
 		then the global mappings.
 		This function can be used to map a key even when it's already
 		mapped, and have it do the original mapping too.  Sketch: >
-			exe 'nnoremap <Tab> ==' . maparg('<Tab>', 'n')
+			exe 'nnoremap <Tab> ==' .. maparg('<Tab>', 'n')
 
 <		Can also be used as a |method|: >
 			GetKey()->maparg('n')
@@ -5786,7 +5786,7 @@ mkdir({name} [, {path} [, {prot}]])
 		{name}.  Thus if you create /tmp/foo/bar then /tmp/foo will be
 		created with 0o755.
 		Example: >
-			:call mkdir($HOME . "/tmp/foo/bar", "p", 0o700)
+			:call mkdir($HOME .. "/tmp/foo/bar", "p", 0o700)
 
 <		This function is not available in the |sandbox|.
 
@@ -6227,7 +6227,7 @@ prompt_setcallback({buf}, {expr})			*prompt_setcallback()*
 		       stopinsert
 		       close
 		     else
-		       call append(line('$') - 1, 'Entered: "' . a:text . '"')
+		       call append(line('$') - 1, 'Entered: "' .. a:text .. '"')
 		       " Reset 'modified' to allow the buffer to be closed.
 		       set nomodified
 		     endif
@@ -6424,7 +6424,7 @@ readdir({directory} [, {expr} [, {dict}]])			*readdir()*
 		  function! s:tree(dir)
 		      return {a:dir : map(readdir(a:dir),
 		      \ {_, x -> isdirectory(x) ?
-		      \		 {x : s:tree(a:dir . '/' . x)} : x})}
+		      \		 {x : s:tree(a:dir .. '/' .. x)} : x})}
 		  endfunction
 		  echo s:tree(".")
 <
@@ -6686,7 +6686,7 @@ remote_peek({serverid} [, {retvar}])		*remote_peek()*
 		{only available when compiled with the |+clientserver| feature}
 		Examples: >
 			:let repl = ""
-			:echo "PEEK: ".remote_peek(id, "repl").": ".repl
+			:echo "PEEK: " .. remote_peek(id, "repl") .. ": " .. repl
 
 <		Can also be used as a |method|: >
 			ServerId()->remote_peek()
@@ -6724,12 +6724,12 @@ remote_send({server}, {string} [, {idvar}])
 		Note: Any errors will be reported in the server and may mess
 		up the display.
 		Examples: >
-		:echo remote_send("gvim", ":DropAndReply ".file, "serverid").
+		:echo remote_send("gvim", ":DropAndReply " .. file, "serverid") ..
 		 \ remote_read(serverid)
 
 		:autocmd NONE RemoteReply *
 		 \ echo remote_read(expand("<amatch>"))
-		:echo remote_send("gvim", ":sleep 10 | echo ".
+		:echo remote_send("gvim", ":sleep 10 | echo " ..
 		 \ 'server2client(expand("<client>"), "HELLO")<CR>')
 <
 		Can also be used as a |method|: >
@@ -6754,7 +6754,7 @@ remove({list}, {idx} [, {end}])				*remove()*
 		points to an item before {idx} this is an error.
 		See |list-index| for possible values of {idx} and {end}.
 		Example: >
-			:echo "last item: " . remove(mylist, -1)
+			:echo "last item: " .. remove(mylist, -1)
 			:call remove(mylist, 0, 9)
 <
 		Use |delete()| to remove a file.
@@ -6770,13 +6770,13 @@ remove({blob}, {idx} [, {end}])
 		byte as {end} a |Blob| with one byte is returned.  When {end}
 		points to a byte before {idx} this is an error.
 		Example: >
-			:echo "last byte: " . remove(myblob, -1)
+			:echo "last byte: " .. remove(myblob, -1)
 			:call remove(mylist, 0, 9)
 
 remove({dict}, {key})
 		Remove the entry from {dict} with key {key} and return it.
 		Example: >
-			:echo "removed " . remove(dict, "one")
+			:echo "removed " .. remove(dict, "one")
 <		If there is no {key} in {dict} this is an error.
 
 rename({from}, {to})					*rename()*
@@ -6907,7 +6907,7 @@ screencol()							*screencol()*
 		column inside the command line, which is 1 when the command is
 		executed. To get the cursor position in the file use one of
 		the following mappings: >
-			nnoremap <expr> GG ":echom ".screencol()."\n"
+			nnoremap <expr> GG ":echom " .. screencol() .. "\n"
 			nnoremap <silent> GG :echom screencol()<CR>
 			nnoremap GG <Cmd>echom screencol()<CR>
 <
@@ -7031,7 +7031,7 @@ search({pattern} [, {flags} [, {stopline} [, {timeout} [, {skip}]]]])
 		Example (goes over all files in the argument list): >
 		    :let n = 1
 		    :while n <= argc()	    " loop over all files in arglist
-		    :  exe "argument " . n
+		    :  exe "argument " .. n
 		    :  " start at the last char in the file and wrap for the
 		    :  " first search to find match at start of file
 		    :  normal G$
@@ -7115,11 +7115,11 @@ searchcount([{options}])					*searchcount()*
 			  return printf(' /%s [%d/%d]', @/,
 			  \		result.current, result.total)
 			endfunction
-			let &statusline .= '%{LastSearchCount()}'
+			let &statusline ..= '%{LastSearchCount()}'
 
 			" Or if you want to show the count only when
 			" 'hlsearch' was on
-			" let &statusline .=
+			" let &statusline ..=
 			" \   '%{v:hlsearch ? LastSearchCount() : ""}'
 <
 		You can also update the search count, which can be useful in a
@@ -7943,10 +7943,10 @@ shellescape({string} [, {special}])			*shellescape()*
 		character inside single quotes.
 
 		Example of use with a |:!| command: >
-		    :exe '!dir ' . shellescape(expand('<cfile>'), 1)
+		    :exe '!dir ' .. shellescape(expand('<cfile>'), 1)
 <		This results in a directory listing for the file under the
 		cursor.  Example of use with |system()|: >
-		    :call system("chmod +w -- " . shellescape(expand("%")))
+		    :call system("chmod +w -- " .. shellescape(expand("%")))
 <		See also |::S|.
 
 		Can also be used as a |method|: >
@@ -8719,7 +8719,7 @@ substitute({string}, {pat}, {sub}, {flags})		*substitute()*
 		When {sub} starts with "\=", the remainder is interpreted as
 		an expression. See |sub-replace-expression|.  Example: >
 		   :echo substitute(s, '%\(\x\x\)',
-			   \ '\=nr2char("0x" . submatch(1))', 'g')
+			   \ '\=nr2char("0x" .. submatch(1))', 'g')
 
 <		When {sub} is a Funcref that function is called, with one
 		optional argument.  Example: >
@@ -8727,7 +8727,7 @@ substitute({string}, {pat}, {sub}, {flags})		*substitute()*
 <		The optional argument is a list which contains the whole
 		matched string and up to nine submatches, like what
 		|submatch()| returns.  Example: >
-		   :echo substitute(s, '%\(\x\x\)', {m -> '0x' . m[1]}, 'g')
+		   :echo substitute(s, '%\(\x\x\)', {m -> '0x' .. m[1]}, 'g')
 
 <		Can also be used as a |method|: >
 			GetString()->substitute(pat, sub, flags)
@@ -8916,8 +8916,8 @@ system({expr} [, {input}])				*system()* *E677*
 		This is not to be used for interactive commands.
 
 		The result is a String.  Example: >
-		    :let files = system("ls " .  shellescape(expand('%:h')))
-		    :let files = system('ls ' . expand('%:h:S'))
+		    :let files = system('ls ' .. shellescape(expand('%:h')))
+		    :let files = system('ls ' .. expand('%:h:S'))
 
 <		To make the result more system-independent, the shell output
 		is filtered to replace <CR> with <NL> for Macintosh, and
@@ -9098,7 +9098,7 @@ tempname()					*tempname()* *temp-file-name*
 		doesn't exist.  It can be used for a temporary file.  The name
 		is different for at least 26 consecutive calls.  Example: >
 			:let tmpfile = tempname()
-			:exe "redir > " . tmpfile
+			:exe "redir > " .. tmpfile
 <		For Unix, the file will be in a private directory |tempfile|.
 		For MS-Windows forward slashes are used when the 'shellslash'
 		option is set, or when 'shellcmdflag' starts with '-' and
@@ -9295,7 +9295,7 @@ trim({text} [, {mask} [, {dir}]])				*trim()*
 		Examples: >
 			echo trim("   some text ")
 <		returns "some text" >
-			echo trim("  \r\t\t\r RESERVE \t\n\x0B\xA0") . "_TAIL"
+			echo trim("  \r\t\t\r RESERVE \t\n\x0B\xA0") .. "_TAIL"
 <		returns "RESERVE_TAIL" >
 			echo trim("rm<Xrm<>X>rrm", "rm<>")
 <		returns "Xrm<>X" (characters in the middle are not removed) >
@@ -9486,7 +9486,7 @@ visualmode([{expr}])						*visualmode()*
 		character-wise, line-wise, or block-wise Visual mode
 		respectively.
 		Example: >
-			:exe "normal " . visualmode()
+			:exe "normal " .. visualmode()
 <		This enters the same Visual mode as before.  It is also useful
 		in scripts if you wish to act differently depending on the
 		Visual mode that was used.
@@ -9690,7 +9690,7 @@ winheight({nr})						*winheight()*
 		An existing window always has a height of zero or more.
 		This excludes any window toolbar line.
 		Examples: >
-  :echo "The current window has " . winheight(0) . " lines."
+  :echo "The current window has " .. winheight(0) .. " lines."
 
 <		Can also be used as a |method|: >
 			GetWinid()->winheight()
@@ -9831,7 +9831,7 @@ winwidth({nr})						*winwidth()*
 		returned.  When window {nr} doesn't exist, -1 is returned.
 		An existing window always has a width of zero or more.
 		Examples: >
-  :echo "The current window has " . winwidth(0) . " columns."
+  :echo "The current window has " .. winwidth(0) .. " columns."
   :if winwidth(0) <= 50
   :  50 wincmd |
   :endif

runtime/doc/change.txt

@@ -946,7 +946,7 @@ Consider using a character like "@" or ":".  There is no problem if the result
 of the expression contains the separation character.
 
 Examples: >
-	:s@\n@\="\r" . expand("$HOME") . "\r"@
+	:s@\n@\="\r" .. expand("$HOME") .. "\r"@
 This replaces an end-of-line with a new line containing the value of $HOME. >
 
 	s/E/\="\<Char-0x20ac>"/g
@@ -1123,7 +1123,7 @@ inside of strings can change!  Also see 'softtabstop' option. >
 			the command.  You need to escape the '|' and '"'
 			characters to prevent them from terminating the
 			command.  Example: >
-				:put ='path' . \",/test\"
+				:put ='path' .. \",/test\"
 <			If there is no expression after '=', Vim uses the
 			previous expression.  You can see it with ":dis =".
 

runtime/doc/channel.txt

@@ -91,7 +91,7 @@ And you should see the message in Vim. You can move the cursor a word forward:
 
 To handle asynchronous communication a callback needs to be used: >
 	func MyHandler(channel, msg)
-	  echo "from the handler: " . a:msg
+	  echo "from the handler: " .. a:msg
 	endfunc
 	call ch_sendexpr(channel, 'hello!', {'callback': "MyHandler"})
 Vim will not wait for a response.  Now the server can send the response later
@@ -136,7 +136,7 @@ When using an IPv6 address, enclose it within square brackets.  E.g.,
 		gets two arguments: the channel and the received message.
 		Example: >
 	func Handle(channel, msg)
-	  echo 'Received: ' . a:msg
+	  echo 'Received: ' .. a:msg
 	endfunc
 	let channel = ch_open("localhost:8765", {"callback": "Handle"})
 <
@@ -1296,7 +1296,7 @@ prompt. >
 
 	" Function handling output from the shell: Added above the prompt.
 	func GotOutput(channel, msg)
-	  call append(line("$") - 1, "- " . a:msg)
+	  call append(line("$") - 1, "- " .. a:msg)
 	endfunc
 
 	" Function handling the shell exist: close the window.

runtime/doc/cmdline.txt

@@ -227,7 +227,7 @@ CTRL-\ e {expr}						*c_CTRL-\_e*
 		Example: >
 			:cmap <F7> <C-\>eAppendSome()<CR>
 			:func AppendSome()
-			   :let cmd = getcmdline() . " Some()"
+			   :let cmd = getcmdline() .. " Some()"
 			   :" place the cursor on the )
 			   :call setcmdpos(strlen(cmd))
 			   :return cmd

runtime/doc/diff.txt

@@ -382,13 +382,13 @@ Example (this does almost the same as 'diffexpr' being empty): >
 	function MyDiff()
 	   let opt = ""
 	   if &diffopt =~ "icase"
-	     let opt = opt . "-i "
+	     let opt = opt .. "-i "
 	   endif
 	   if &diffopt =~ "iwhite"
-	     let opt = opt . "-b "
+	     let opt = opt .. "-b "
 	   endif
-	   silent execute "!diff -a --binary " . opt . v:fname_in . " " . v:fname_new .
-		\  " > " . v:fname_out
+	   silent execute "!diff -a --binary " .. opt .. v:fname_in .. " " .. v:fname_new ..
+		\  " > " .. v:fname_out
 	   redraw!
 	endfunction
 
@@ -445,8 +445,8 @@ Example (this does the same as 'patchexpr' being empty): >
 
 	set patchexpr=MyPatch()
 	function MyPatch()
-	   :call system("patch -o " . v:fname_out . " " . v:fname_in .
-	   \  " < " . v:fname_diff)
+	   :call system("patch -o " .. v:fname_out .. " " .. v:fname_in ..
+	   \  " < " .. v:fname_diff)
 	endfunction
 
 Make sure that using the "patch" program doesn't have unwanted side effects.

runtime/doc/editing.txt

@@ -444,9 +444,9 @@ does apply like to other wildcards.
 
 Environment variables in the expression are expanded when evaluating the
 expression, thus this works: >
-	:e `=$HOME . '/.vimrc'`
+	:e `=$HOME .. '/.vimrc'`
 This does not work, $HOME is inside a string and used literally: >
-	:e `='$HOME' . '/.vimrc'`
+	:e `='$HOME' .. '/.vimrc'`
 
 If the expression returns a string then names are to be separated with line
 breaks.  When the result is a |List| then each item is used as a name.  Line

runtime/doc/eval.txt

@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 8.2.  Last change: 2022 Feb 20
+*eval.txt*	For Vim version 8.2.  Last change: 2022 Feb 21
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -470,7 +470,7 @@ It is also possible to put remaining items in a List variable: >
 	:for [i, j; rest] in listlist
 	:   call Doit(i, j)
 	:   if !empty(rest)
-	:      echo "remainder: " . string(rest)
+	:      echo "remainder: " .. string(rest)
 	:   endif
 	:endfor
 
@@ -498,11 +498,11 @@ Functions that are useful with a List: >
 	:let list = split("a b c")	" create list from items in a string
 	:let string = join(list, ', ')	" create string from list items
 	:let s = string(list)		" String representation of list
-	:call map(list, '">> " . v:val')  " prepend ">> " to each item
+	:call map(list, '">> " .. v:val')  " prepend ">> " to each item
 
 Don't forget that a combination of features can make things simple.  For
 example, to add up all the numbers in a list: >
-	:exe 'let sum = ' . join(nrlist, '+')
+	:exe 'let sum = ' .. join(nrlist, '+')
 
 
 1.4 Dictionaries ~
@@ -568,7 +568,7 @@ turn the Dictionary into a List and pass it to |:for|.
 
 Most often you want to loop over the keys, using the |keys()| function: >
 	:for key in keys(mydict)
-	:   echo key . ': ' . mydict[key]
+	:   echo key .. ': ' .. mydict[key]
 	:endfor
 
 The List of keys is unsorted.  You may want to sort them first: >
@@ -576,13 +576,13 @@ The List of keys is unsorted.  You may want to sort them first: >
 
 To loop over the values use the |values()| function:  >
 	:for v in values(mydict)
-	:   echo "value: " . v
+	:   echo "value: " .. v
 	:endfor
 
 If you want both the key and the value use the |items()| function.  It returns
 a List in which each item is a List with two items, the key and the value: >
 	:for [key, value] in items(mydict)
-	:   echo key . ': ' . value
+	:   echo key .. ': ' .. value
 	:endfor
 
 
@@ -677,7 +677,7 @@ Functions that can be used with a Dictionary: >
 	:let small = min(dict)		" minimum value in dict
 	:let xs = count(dict, 'x')	" count nr of times 'x' appears in dict
 	:let s = string(dict)		" String representation of dict
-	:call map(dict, '">> " . v:val')  " prepend ">> " to each item
+	:call map(dict, '">> " .. v:val')  " prepend ">> " to each item
 
 
 1.5 Blobs ~
@@ -921,13 +921,13 @@ Expression nesting is limited to 1000 levels deep (300 when build with MSVC)
 to avoid running out of stack and crashing. *E1169*
 
 
-expr1				*expr1* *trinary* *falsy-operator* *??* *E109*
+expr1				*expr1* *ternary* *falsy-operator* *??* *E109*
 -----
 
-The trinary operator: expr2 ? expr1 : expr1
+The ternary operator: expr2 ? expr1 : expr1
 The falsy operator:   expr2 ?? expr1
 
-Trinary operator ~
+Ternary operator ~
 
 In legacy script the expression before the '?' is evaluated to a number.  If
 it evaluates to |TRUE|, the result is the value of the expression between the
@@ -1530,7 +1530,7 @@ option						*expr-option* *E112* *E113*
 &l:option		local option value
 
 Examples: >
-	echo "tabstop is " . &tabstop
+	echo "tabstop is " .. &tabstop
 	if &insertmode
 
 Any option name can be used here.  See |options|.  When using the local value
@@ -1820,7 +1820,7 @@ maintain a counter: >
 	  echo "script executed for the first time"
 	else
 	  let s:counter = s:counter + 1
-	  echo "script executed " . s:counter . " times now"
+	  echo "script executed " .. s:counter .. " times now"
 	endif
 
 Note that this means that filetype plugins don't get a different set of script
@@ -1955,7 +1955,7 @@ v:completed_item
 					*v:count* *count-variable*
 v:count		The count given for the last Normal mode command.  Can be used
 		to get the count before a mapping.  Read-only.  Example: >
-	:map _x :<C-U>echo "the count is " . v:count<CR>
+	:map _x :<C-U>echo "the count is " .. v:count<CR>
 <		Note: The <C-U> is required to remove the line range that you
 		get when typing ':' after a count.
 		When there are two counts, as in "3d2w", they are multiplied,
@@ -2829,9 +2829,9 @@ Example: >
   :  echohl Title
   :  echo a:title
   :  echohl None
-  :  echo a:0 . " items:"
+  :  echo a:0 .. " items:"
   :  for s in a:000
-  :    echon ' ' . s
+  :    echon ' ' .. s
   :  endfor
   :endfunction
 
@@ -2874,7 +2874,7 @@ This function can then be called with: >
 		this works:
 						*function-range-example*  >
 	:function Mynumber(arg)
-	:  echo line(".") . " " . a:arg
+	:  echo line(".") .. " " .. a:arg
 	:endfunction
 	:1,5call Mynumber(getline("."))
 <
@@ -2885,7 +2885,7 @@ This function can then be called with: >
 		Example of a function that handles the range itself: >
 
 	:function Cont() range
-	:  execute (a:firstline + 1) . "," . a:lastline . 's/^/\t\\ '
+	:  execute (a:firstline + 1) .. "," .. a:lastline .. 's/^/\t\\ '
 	:endfunction
 	:4,8call Cont()
 <
@@ -3077,7 +3077,7 @@ declarations and assignments do not use a command.  |vim9-declaration|
 			This cannot be used to add an item to a |List|.
 			This cannot be used to set a byte in a String.  You
 			can do that like this: >
-				:let var = var[0:2] . 'X' . var[4:]
+				:let var = var[0:2] .. 'X' .. var[4:]
 <			When {var-name} is a |Blob| then {idx} can be the
 			length of the blob, in which case one byte is
 			appended.
@@ -3147,7 +3147,7 @@ declarations and assignments do not use a command.  |vim9-declaration|
 			is just like using the |:set| command: both the local
 			value and the global value are changed.
 			Example: >
-				:let &path = &path . ',/usr/local/include'
+				:let &path = &path .. ',/usr/local/include'
 <			This also works for terminal codes in the form t_xx.
 			But only for alphanumerical names.  Example: >
 				:let &t_k1 = "\<Esc>[234;"
@@ -3425,6 +3425,8 @@ text...
 :if {expr1}			*:if* *:end* *:endif* *:en* *E171* *E579* *E580*
 :en[dif]		Execute the commands until the next matching ":else"
 			or ":endif" if {expr1} evaluates to non-zero.
+			Although the short forms work, it is recommended to
+			always use `:endif` to avoid confusion.
 
 			From Vim version 4.5 until 5.0, every Ex command in
 			between the ":if" and ":endif" is ignored.  These two
@@ -4028,7 +4030,7 @@ exception most recently caught as long it is not finished.
 
 	:function! Caught()
 	:  if v:exception != ""
-	:    echo 'Caught "' . v:exception . '" in ' . v:throwpoint
+	:    echo 'Caught "' . v:exception .. '" in ' .. v:throwpoint
 	:  else
 	:    echo 'Nothing caught'
 	:  endif
@@ -4431,8 +4433,8 @@ a script in order to catch unexpected things.
 	:catch /^Vim:Interrupt$/
 	:    echo "Script interrupted"
 	:catch /.*/
-	:  echo "Internal error (" . v:exception . ")"
-	:  echo " - occurred at " . v:throwpoint
+	:  echo "Internal error (" .. v:exception .. ")"
+	:  echo " - occurred at " .. v:throwpoint
 	:endtry
 	:" end of script
 
@@ -4628,7 +4630,7 @@ parentheses can be cut out from |v:exception| with the ":substitute" command.
 
 	:function! CheckRange(a, func)
 	:  if a:a < 0
-	:    throw "EXCEPT:MATHERR:RANGE(" . a:func . ")"
+	:    throw "EXCEPT:MATHERR:RANGE(" .. a:func .. ")"
 	:  endif
 	:endfunction
 	:
@@ -4655,7 +4657,7 @@ parentheses can be cut out from |v:exception| with the ":substitute" command.
 	:  try
 	:    execute "write" fnameescape(a:file)
 	:  catch /^Vim(write):/
-	:    throw "EXCEPT:IO(" . getcwd() . ", " . a:file . "):WRITEERR"
+	:    throw "EXCEPT:IO(" .. getcwd() .. ", " .. a:file .. "):WRITEERR"
 	:  endtry
 	:endfunction
 	:
@@ -4674,9 +4676,9 @@ parentheses can be cut out from |v:exception| with the ":substitute" command.
 	:  let dir = substitute(v:exception, '.*(\(.\+\),\s*.\+).*', '\1', "")
 	:  let file = substitute(v:exception, '.*(.\+,\s*\(.\+\)).*', '\1', "")
 	:  if file !~ '^/'
-	:    let file = dir . "/" . file
+	:    let file = dir .. "/" .. file
 	:  endif
-	:  echo 'I/O error for "' . file . '"'
+	:  echo 'I/O error for "' .. file .. '"'
 	:
 	:catch /^EXCEPT/
 	:  echo "Unspecified error"
@@ -4744,7 +4746,7 @@ clauses, however, is executed.
 	:    echo "inner finally"
 	:  endtry
 	:catch
-	:  echo 'outer catch-all caught "' . v:exception . '"'
+	:  echo 'outer catch-all caught "' .. v:exception .. '"'
 	:  finally
 	:    echo "outer finally"
 	:endtry
@@ -4806,7 +4808,7 @@ Printing in Binary ~
   :  let n = a:nr
   :  let r = ""
   :  while n
-  :    let r = '01'[n % 2] . r
+  :    let r = '01'[n % 2] .. r
   :    let n = n / 2
   :  endwhile
   :  return r
@@ -4817,7 +4819,7 @@ Printing in Binary ~
   :func String2Bin(str)
   :  let out = ''
   :  for ix in range(strlen(a:str))
-  :    let out = out . '-' . Nr2Bin(char2nr(a:str[ix]))
+  :    let out = out .. '-' .. Nr2Bin(char2nr(a:str[ix]))
   :  endfor
   :  return out[1:]
   :endfunc

runtime/doc/fold.txt

@@ -507,7 +507,7 @@ Note the use of backslashes to avoid some characters to be interpreted by the
     :function MyFoldText()
     :  let line = getline(v:foldstart)
     :  let sub = substitute(line, '/\*\|\*/\|{{{\d\=', '', 'g')
-    :  return v:folddashes . sub
+    :  return v:folddashes .. sub
     :endfunction
 
 Evaluating 'foldtext' is done in the |sandbox|.  The current window is set to

runtime/doc/ft_raku.txt

@@ -47,20 +47,20 @@ Numbers, subscripts and superscripts are available with 's' and 'S':
 
 But some don't come defined by default. Those are digraph definitions you can
 add in your ~/.vimrc file. >
-	exec 'digraph \\ '.char2nr('∖')
-	exec 'digraph \< '.char2nr('≼')
-	exec 'digraph \> '.char2nr('≽')
-	exec 'digraph (L '.char2nr('⊈')
-	exec 'digraph )L '.char2nr('⊉')
-	exec 'digraph (/ '.char2nr('⊄')
-	exec 'digraph )/ '.char2nr('⊅')
-	exec 'digraph )/ '.char2nr('⊅')
-	exec 'digraph U+ '.char2nr('⊎')
-	exec 'digraph 0- '.char2nr('⊖')
+	exec 'digraph \\ ' .. char2nr('∖')
+	exec 'digraph \< ' .. char2nr('≼')
+	exec 'digraph \> ' .. char2nr('≽')
+	exec 'digraph (L ' .. char2nr('⊈')
+	exec 'digraph )L ' .. char2nr('⊉')
+	exec 'digraph (/ ' .. char2nr('⊄')
+	exec 'digraph )/ ' .. char2nr('⊅')
+	exec 'digraph )/ ' .. char2nr('⊅')
+	exec 'digraph U+ ' .. char2nr('⊎')
+	exec 'digraph 0- ' .. char2nr('⊖')
 	" Euler's constant
-	exec 'digraph ne '.char2nr('𝑒')
+	exec 'digraph ne ' .. char2nr('𝑒')
 	" Raku's atomic operations marker
-	exec 'digraph @@ '.char2nr('⚛')
+	exec 'digraph @@ ' .. char2nr('⚛')
 
 Alternatively, you can write Insert mode abbreviations that convert ASCII-
 based operators into their single-character Unicode equivalent. >

runtime/doc/ft_rust.txt

@@ -26,7 +26,7 @@ behavior of the plugin.
 g:rustc_path~
 	Set this option to the path to rustc for use in the |:RustRun| and
 	|:RustExpand| commands. If unset, "rustc" will be located in $PATH: >
-	    let g:rustc_path = $HOME."/bin/rustc"
+	    let g:rustc_path = $HOME .. "/bin/rustc"
 <
 
                                                   *g:rustc_makeprg_no_percent*
@@ -87,7 +87,7 @@ g:rust_bang_comment_leader~
 g:ftplugin_rust_source_path~
 	Set this option to a path that should be prepended to 'path' for Rust
 	source files: >
-	    let g:ftplugin_rust_source_path = $HOME.'/dev/rust'
+	    let g:ftplugin_rust_source_path = $HOME .. '/dev/rust'
 <
 
                                                        *g:rustfmt_command*

runtime/doc/ft_sql.txt

@@ -109,8 +109,8 @@ must be configurable.  The filetype plugin attempts to define many of the
 standard objects, plus many additional ones.  In order to make this as
 flexible as possible, you can override the list of objects from within your
 |vimrc| with the following: >
-    let g:ftplugin_sql_objects = 'function,procedure,event,table,trigger' .
-		\ ',schema,service,publication,database,datatype,domain' .
+    let g:ftplugin_sql_objects = 'function,procedure,event,table,trigger' ..
+		\ ',schema,service,publication,database,datatype,domain' ..
 		\ ',index,subscription,synchronization,view,variable'
 
 The following |Normal| mode and |Visual| mode maps have been created which use
@@ -131,10 +131,10 @@ Repeatedly pressing ]} will cycle through each of these create statements: >
     create index i1 on t1 (c1);
 
 The default setting for g:ftplugin_sql_objects is: >
-    let g:ftplugin_sql_objects = 'function,procedure,event,' .
-		\ '\\(existing\\\\|global\\s\\+temporary\\s\\+\\)\\\{,1}' .
-		\ 'table,trigger' .
-		\ ',schema,service,publication,database,datatype,domain' .
+    let g:ftplugin_sql_objects = 'function,procedure,event,' ..
+		\ '\\(existing\\\\|global\\s\\+temporary\\s\\+\\)\\\{,1}' ..
+		\ 'table,trigger' ..
+		\ ',schema,service,publication,database,datatype,domain' ..
 		\ ',index,subscription,synchronization,view,variable'
 
 The above will also handle these cases: >

runtime/doc/gui.txt

@@ -155,8 +155,8 @@ If you are running the X Window System, you can get information about the
 window Vim is running in with these commands: >
 	:!xwininfo -id $WINDOWID
 	:!xprop -id $WINDOWID
-	:execute '!xwininfo -id ' . v:windowid
-	:execute '!xprop -id ' . v:windowid
+	:execute '!xwininfo -id ' .. v:windowid
+	:execute '!xprop -id ' .. v:windowid
 <
 							*gui-IME* *iBus*
 Input methods for international characters in X that rely on the XIM

runtime/doc/help.txt

@@ -1,4 +1,4 @@
-*help.txt*	For Vim version 8.2.  Last change: 2021 Dec 27
+*help.txt*	For Vim version 8.2.  Last change: 2022 Feb 26
 
 			VIM - main help file
 									 k
@@ -197,6 +197,7 @@ Versions ~
 |version6.txt|	Differences between Vim version 5.7 and 6.x
 |version7.txt|	Differences between Vim version 6.4 and 7.x
 |version8.txt|	Differences between Vim version 7.4 and 8.x
+|version9.txt|	Differences between Vim version 8.2 and 9.0
 						*sys-file-list*
 Remarks about specific systems ~
 |os_390.txt|	OS/390 Unix

runtime/doc/if_pyth.txt

@@ -1,4 +1,4 @@
-*if_pyth.txt*   For Vim version 8.2.  Last change: 2022 Feb 07
+*if_pyth.txt*   For Vim version 8.2.  Last change: 2022 Feb 22
 
 
 		  VIM REFERENCE MANUAL    by Paul Moore
@@ -25,6 +25,10 @@ The Python 3 interface is available only when Vim was compiled with the
 |+python3| feature.
 Both can be available at the same time, but read |python-2-and-3|.
 
+NOTE: Python 2 is old and no longer being developed.  Using Python 3 is highly
+recommended.  Python 2 support will be dropped when it does not work properly
+anymore.
+
 ==============================================================================
 1. Commands						*python-commands*
 
@@ -923,7 +927,7 @@ The `:pyxdo` command works similar to `:pydo`.
 							*has-pythonx*
 You can test if pyx* commands are available with: >
 	if has('pythonx')
-	  echo 'pyx* commands are available. (Python ' . &pyx . ')'
+	  echo 'pyx* commands are available. (Python ' .. &pyx .. ')'
 	endif
 
 When compiled with only one of |+python| or |+python3|, the has() returns 1.

runtime/doc/insert.txt

@@ -879,9 +879,9 @@ Groß): >
       endif
       let res = []
       let h = ''
-      for l in systemlist('aiksaurus '.shellescape(a:base))
+      for l in systemlist('aiksaurus ' .. shellescape(a:base))
 	if l[:3] == '=== '
-	  let h = '('.substitute(l[4:], ' =*$', ')', '')
+	  let h = '(' .. substitute(l[4:], ' =*$', ')', '')
 	elseif l ==# 'Alphabetically similar known words are: '
 	  let h = "\U0001f52e"
 	elseif l[0] =~ '\a' || (h ==# "\U0001f52e" && l[0] ==# "\t")
@@ -1266,7 +1266,7 @@ An example that completes the names of the months: >
 	    " find months matching with "a:base"
 	    let res = []
 	    for m in split("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec")
-	      if m =~ '^' . a:base
+	      if m =~ '^' .. a:base
 		call add(res, m)
 	      endif
 	    endfor
@@ -1288,7 +1288,7 @@ The same, but now pretending searching for matches is slow: >
 	  else
 	    " find months matching with "a:base"
 	    for m in split("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec")
-	      if m =~ '^' . a:base
+	      if m =~ '^' .. a:base
 		call complete_add(m)
 	      endif
 	      sleep 300m	" simulate searching for next match

runtime/doc/map.txt

@@ -314,7 +314,7 @@ Here is an example that inserts a list number that increases: >
 
 	func ListItem()
 	  let g:counter += 1
-	  return g:counter . '. '
+	  return g:counter .. '. '
 	endfunc
 
 	func ListReset()
@@ -1697,12 +1697,12 @@ The valid escape sequences are
 		Examples: >
 		    command! -nargs=+ -complete=file MyEdit
 				\ for f in expand(<q-args>, 0, 1) |
-				\ exe '<mods> split ' . f |
+				\ exe '<mods> split ' .. f |
 				\ endfor
 
 		    function! SpecialEdit(files, mods)
 			for f in expand(a:files, 0, 1)
-			    exe a:mods . ' split ' . f
+			    exe a:mods .. ' split ' .. f
 			endfor
 		    endfunction
 		    command! -nargs=+ -complete=file Sedit
@@ -1778,7 +1778,7 @@ This will invoke: >
    :   let i = 0
    :   while i < argc()
    :	  if filereadable(argv(i))
-   :	     execute "e " . argv(i)
+   :	     execute "e " .. argv(i)
    :	     execute a:command
    :      endif
    :      let i = i + 1

runtime/doc/motion.txt

@@ -1019,7 +1019,7 @@ These commands are not marks themselves, but jump to a mark:
 				:let lnum = line(".")
 				:keepjumps normal gg
 				:call SetLastChange()
-				:keepjumps exe "normal " . lnum . "G"
+				:keepjumps exe "normal " .. lnum .. "G"
 <
 			Note that ":keepjumps" must be used for every command.
 			When invoking a function the commands in that function

runtime/doc/options.txt

@@ -1142,7 +1142,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	If you like to keep a lot of backups, you could use a BufWritePre
 	autocommand to change 'backupext' just before writing the file to
 	include a timestamp. >
-		:au BufWritePre * let &bex = '-' . strftime("%Y%b%d%X") . '~'
+		:au BufWritePre * let &bex = '-' .. strftime("%Y%b%d%X") .. '~'
 <	Use 'backupdir' to put the backup in a different directory.
 
 						*'backupskip'* *'bsk'*
@@ -1167,7 +1167,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 
 	Note that environment variables are not expanded.  If you want to use
 	$HOME you must expand it explicitly, e.g.: >
-		:let &backupskip = escape(expand('$HOME'), '\') . '/tmp/*'
+		:let &backupskip = escape(expand('$HOME'), '\') .. '/tmp/*'
 
 <	Note that the default also makes sure that "crontab -e" works (when a
 	backup would be made by renaming the original file crontab won't see
@@ -1218,10 +1218,10 @@ A jump table for the options with a short description can be found at |Q_op|.
 	The evaluation of the expression must not have side effects!
 	Example: >
     function MyBalloonExpr()
-	return 'Cursor is at line ' . v:beval_lnum .
-		\', column ' . v:beval_col .
-		\ ' of file ' .  bufname(v:beval_bufnr) .
-		\ ' on word "' . v:beval_text . '"'
+	return 'Cursor is at line ' .. v:beval_lnum ..
+		\ ', column ' .. v:beval_col ..
+		\ ' of file ' ..  bufname(v:beval_bufnr) ..
+		\ ' on word "' .. v:beval_text .. '"'
     endfunction
     set bexpr=MyBalloonExpr()
     set ballooneval
@@ -1537,7 +1537,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	If the default value taken from $CDPATH is not what you want, include
 	a modified version of the following command in your vimrc file to
 	override it: >
-	  :let &cdpath = ',' . substitute(substitute($CDPATH, '[, ]', '\\\0', 'g'), ':', ',', 'g')
+	  :let &cdpath = ',' .. substitute(substitute($CDPATH, '[, ]', '\\\0', 'g'), ':', ',', 'g')
 <	This option cannot be set from a |modeline| or in the |sandbox|, for
 	security reasons.
 	(parts of 'cdpath' can be passed to the shell to expand file names).
@@ -1582,8 +1582,8 @@ A jump table for the options with a short description can be found at |Q_op|.
 		set charconvert=CharConvert()
 		fun CharConvert()
 		  system("recode "
-			\ . v:charconvert_from . ".." . v:charconvert_to
-			\ . " <" . v:fname_in . " >" v:fname_out)
+			\ .. v:charconvert_from .. ".." .. v:charconvert_to
+			\ .. " <" .. v:fname_in .. " >" .. v:fname_out)
 		  return v:shell_error
 		endfun
 <	The related Vim variables are:
@@ -4887,7 +4887,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 			|+multi_lang| features}
 	Language to use for menu translation.  Tells which file is loaded
 	from the "lang" directory in 'runtimepath': >
-		"lang/menu_" . &langmenu . ".vim"
+		"lang/menu_" .. &langmenu .. ".vim"
 <	(without the spaces).  For example, to always use the Dutch menus, no
 	matter what $LANG is set to: >
 		:set langmenu=nl_NL.ISO_8859-1
@@ -5901,7 +5901,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 <	To use an environment variable, you probably need to replace the
 	separator.  Here is an example to append $INCL, in which directory
 	names are separated with a semi-colon: >
-		:let &path = &path . "," . substitute($INCL, ';', ',', 'g')
+		:let &path = &path .. "," .. substitute($INCL, ';', ',', 'g')
 <	Replace the ';' with a ':' or whatever separator is used.  Note that
 	this doesn't work when $INCL contains a comma or white space.
 
@@ -8318,7 +8318,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	This option cannot be set in a modeline when 'modelineexpr' is off.
 
 	Example: >
-    :auto BufEnter * let &titlestring = hostname() . "/" . expand("%:p")
+    :auto BufEnter * let &titlestring = hostname() .. "/" .. expand("%:p")
     :set title titlestring=%<%F%=%l/%L-%P titlelen=70
 <	The value of 'titlelen' is used to align items in the middle or right
 	of the available space.

runtime/doc/os_vms.txt

@@ -603,13 +603,13 @@ program to the new diff on VMS.  Add this to your .vimrc file: >
 	function MyDiff()
 	   let opt = ""
 	   if &diffopt =~ "icase"
-	     let opt = opt . "-i "
+	     let opt = opt .. "-i "
 	   endif
 	   if &diffopt =~ "iwhite"
-	     let opt = opt . "-b "
+	     let opt = opt .. "-b "
 	   endif
-	   silent execute "!mc GNU:diff.exe -a " . opt . v:fname_in . " " .  v:fname_new .
-		\  " > " . v:fname_out
+	   silent execute "!mc GNU:diff.exe -a " .. opt .. v:fname_in .. " " ..  v:fname_new ..
+		\  " > " .. v:fname_out
 	endfunction
       endif
 

runtime/doc/pattern.txt

@@ -963,7 +963,7 @@ $	At end of pattern or in front of "\|", "\)" or "\n" ('magic' on):
 	the cursor moves the display isn't updated for this change.  An update
 	is done when using the |CTRL-L| command (the whole screen is updated).
 	Example, to highlight the column where the cursor currently is: >
-		:exe '/\%' . col(".") . 'c'
+		:exe '/\%' .. col(".") .. 'c'
 <	Alternatively use: >
 		/\%.c
 <	When 'hlsearch' is set and you move the cursor around and make changes

runtime/doc/pi_netrw.txt

@@ -968,7 +968,7 @@ itself:
      fun! NetReadFixup(method, line1, line2)
        if method == 3   " ftp (no <.netrc>)
         let fourblanklines= line2 - 3
-        silent fourblanklines.",".line2."g/^\s*/d"
+        silent fourblanklines .. "," .. line2 .. "g/^\s*/d"
        endif
      endfunction
     endif
@@ -1975,7 +1975,7 @@ To use this function, simply assign its output to |g:netrw_list_hide| option.  >
 	Example: let g:netrw_list_hide= netrw_gitignore#Hide('my_gitignore_file')
 		Function can take additional files with git-ignore patterns.
 
-	Example: g:netrw_list_hide= netrw_gitignore#Hide() . '.*\.swp$'
+	Example: let g:netrw_list_hide= netrw_gitignore#Hide() .. '.*\.swp$'
 		Combining 'netrw_gitignore#Hide' with custom patterns.
 <
 
@@ -2825,7 +2825,7 @@ your browsing preferences.  (see also: |netrw-settings|)
 
 				Examples:
 				 let g:netrw_list_hide= '.*\.swp$'
-				 let g:netrw_list_hide= netrw_gitignore#Hide().'.*\.swp$'
+				 let g:netrw_list_hide= netrw_gitignore#Hide() .. '.*\.swp$'
 				default: ""
 
   *g:netrw_localcopycmd*	="cp"           Linux/Unix/MacOS/Cygwin

runtime/doc/print.txt

@@ -139,28 +139,28 @@ If there is no error, return zero or an empty string.
 The default for non MS-Windows or VMS systems is to simply use "lpr" to print
 the file: >
 
-    system('lpr' . (&printdevice == '' ? '' : ' -P' . &printdevice)
-	. ' ' . v:fname_in) . delete(v:fname_in) + v:shell_error
+    system('lpr' .. (&printdevice == '' ? '' : ' -P' .. &printdevice)
+	.. ' ' .. v:fname_in) .. delete(v:fname_in) + v:shell_error
 
 On MS-Windows machines the default is to copy the file to the currently
 specified printdevice: >
 
-    system('copy' . ' ' . v:fname_in . (&printdevice == ''
-		? ' LPT1:' : (' \"' . &printdevice . '\"')))
-		. delete(v:fname_in)
+    system('copy' .. ' ' .. v:fname_in .. (&printdevice == ''
+		? ' LPT1:' : (' \"' .. &printdevice .. '\"')))
+		.. delete(v:fname_in)
 
 On VMS machines the default is to send the file to either the default or
 currently specified printdevice: >
 
-    system('print' . (&printdevice == '' ? '' : ' /queue=' .
-		&printdevice) . ' ' . v:fname_in) . delete(v:fname_in)
+    system('print' .. (&printdevice == '' ? '' : ' /queue=' ..
+		&printdevice) .. ' ' .. v:fname_in) .. delete(v:fname_in)
 
 If you change this option, using a function is an easy way to avoid having to
 escape all the spaces.  Example: >
 
 	:set printexpr=PrintFile(v:fname_in)
 	:function PrintFile(fname)
-	:  call system("ghostview " . a:fname)
+	:  call system("ghostview " .. a:fname)
 	:  call delete(a:fname)
 	:  return v:shell_error
 	:endfunc

runtime/doc/quickfix.txt

@@ -1,4 +1,4 @@
-*quickfix.txt*  For Vim version 8.2.  Last change: 2022 Feb 08
+*quickfix.txt*  For Vim version 8.2.  Last change: 2022 Feb 22
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -353,7 +353,7 @@ processing a quickfix or location list command, it will be aborted.
 			cursor position will not be changed. See |:cexpr| for
 			more information.
 			Example: >
-    :g/mypattern/caddexpr expand("%") . ":" . line(".") .  ":" . getline(".")
+    :g/mypattern/caddexpr expand("%") .. ":" .. line(".") ..  ":" .. getline(".")
 <
 						*:lad* *:addd* *:laddexpr*
 :lad[dexpr] {expr}	Same as ":caddexpr", except the location list for the
@@ -654,6 +654,24 @@ quickfix window.  If there already is a window for that file, it is used
 instead.  If the buffer in the used window has changed, and the error is in
 another file, jumping to the error will fail.  You will first have to make
 sure the window contains a buffer which can be abandoned.
+
+The following steps are used to find a window to open the file selected from
+the quickfix window:
+1. If 'switchbuf' contains "usetab", then find a window in any tabpage
+   (starting with the first tabpage) that has the selected file and jump to
+   it.
+2. Otherwise find a window displaying the selected file in the current tab
+   page (starting with the window before the quickfix window) and use it.
+3. Otherwise find a window displaying a normal buffer ('buftype' is empty)
+   starting with the window before the quickfix window. If a window is found,
+   open the file in that window.
+4. If a usable window is not found and 'switchbuf' contains "uselast", then
+   open the file in the last used window.
+5. Otherwise open the file in the window before the quickfix window.  If there
+   is no previous window, then open the file in the next window.
+6. If a usable window is not found in the above steps, then create a new
+   horizontally split window above the quickfix window and open the file.
+
 					*CTRL-W_<Enter>* *CTRL-W_<CR>*
 You can use CTRL-W <Enter> to open a new window and jump to the error there.
 
@@ -663,7 +681,7 @@ FileType event (also see |qf.vim|).  Then the BufReadPost event is triggered,
 using "quickfix" for the buffer name.  This can be used to perform some action
 on the listed errors.  Example: >
 	au BufReadPost quickfix  setlocal modifiable
-		\ | silent exe 'g/^/s//\=line(".")." "/'
+		\ | silent exe 'g/^/s//\=line(".") .. " "/'
 		\ | setlocal nomodifiable
 This prepends the line number to each line.  Note the use of "\=" in the
 substitute string of the ":s" command, which is used to evaluate an

runtime/doc/sign.txt

@@ -101,7 +101,7 @@ precedence, otherwise the 'cursorline' highlighting.
 Here is an example that places a sign "piet", displayed with the text ">>", in
 line 23 of the current file: >
 	:sign define piet text=>> texthl=Search
-	:exe ":sign place 2 line=23 name=piet file=" . expand("%:p")
+	:exe ":sign place 2 line=23 name=piet file=" .. expand("%:p")
 
 And here is the command to delete it again: >
 	:sign unplace 2

runtime/doc/spell.txt

@@ -131,8 +131,8 @@ zuG			Undo |zW| and |zG|, remove the word from the internal
 			rare as this is a fairly uncommon command and all
 			intuitive commands for this are already taken. If you
 			want you can add mappings with e.g.: >
-		nnoremap z?  :exe ':spellrare  ' . expand('<cWORD>')<CR>
-		nnoremap z/  :exe ':spellrare! ' . expand('<cWORD>')<CR>
+		nnoremap z?  :exe ':spellrare  ' .. expand('<cWORD>')<CR>
+		nnoremap z/  :exe ':spellrare! ' .. expand('<cWORD>')<CR>
 <			|:spellundo|, |zuw|, or |zuW| can be used to undo this.
 
 :spellr[rare]! {word}	Add {word} as a rare word to the internal word

runtime/doc/starting.txt

@@ -1378,7 +1378,7 @@ resulting file, when executed with a ":source" command:
 After restoring the Session, the full filename of your current Session is
 available in the internal variable "v:this_session" |this_session-variable|.
 An example mapping: >
-  :nmap <F2> :wa<Bar>exe "mksession! " . v:this_session<CR>:so ~/sessions/
+  :nmap <F2> :wa<Bar>exe "mksession! " .. v:this_session<CR>:so ~/sessions/
 This saves the current Session, and starts off the command to load another.
 
 A session includes all tab pages, unless "tabpages" was removed from

runtime/doc/syntax.txt

@@ -653,7 +653,7 @@ evaluate to get a unique string to append to each ID used in a given document,
 so that the full IDs will be unique even when combined with other content in a
 larger HTML document. Example, to append _ and the buffer number to each ID: >
 
-	:let g:html_id_expr = '"_".bufnr("%")'
+	:let g:html_id_expr = '"_" .. bufnr("%")'
 <
 To append a string "_mystring" to the end of each ID: >
 
@@ -3607,8 +3607,8 @@ Do you want to draw with the mouse?  Try the following: >
    :function! GetPixel()
    :   let c = getline(".")[col(".") - 1]
    :   echo c
-   :   exe "noremap <LeftMouse> <LeftMouse>r".c
-   :   exe "noremap <LeftDrag>	<LeftMouse>r".c
+   :   exe "noremap <LeftMouse> <LeftMouse>r" .. c
+   :   exe "noremap <LeftDrag>	<LeftMouse>r" .. c
    :endfunction
    :noremap <RightMouse> <LeftMouse>:call GetPixel()<CR>
    :set guicursor=n:hor20	   " to see the color beneath the cursor
@@ -5567,9 +5567,9 @@ types.vim: *.[ch]
 And put these lines in your .vimrc: >
 
    " load the types.vim highlighting file, if it exists
-   autocmd BufRead,BufNewFile *.[ch] let fname = expand('<afile>:p:h') . '/types.vim'
+   autocmd BufRead,BufNewFile *.[ch] let fname = expand('<afile>:p:h') .. '/types.vim'
    autocmd BufRead,BufNewFile *.[ch] if filereadable(fname)
-   autocmd BufRead,BufNewFile *.[ch]   exe 'so ' . fname
+   autocmd BufRead,BufNewFile *.[ch]   exe 'so ' .. fname
    autocmd BufRead,BufNewFile *.[ch] endif
 
 ==============================================================================

runtime/doc/tabpage.txt

@@ -381,24 +381,24 @@ pages and define labels for them.  Then get the label for each tab page. >
 	  for i in range(tabpagenr('$'))
 	    " select the highlighting
 	    if i + 1 == tabpagenr()
-	      let s .= '%#TabLineSel#'
+	      let s ..= '%#TabLineSel#'
 	    else
-	      let s .= '%#TabLine#'
+	      let s ..= '%#TabLine#'
 	    endif
 
 	    " set the tab page number (for mouse clicks)
-	    let s .= '%' . (i + 1) . 'T'
+	    let s ..= '%' .. (i + 1) .. 'T'
 
 	    " the label is made by MyTabLabel()
-	    let s .= ' %{MyTabLabel(' . (i + 1) . ')} '
+	    let s ..= ' %{MyTabLabel(' .. (i + 1) .. ')} '
 	  endfor
 
 	  " after the last tab fill with TabLineFill and reset tab page nr
-	  let s .= '%#TabLineFill#%T'
+	  let s ..= '%#TabLineFill#%T'
 
 	  " right-align the label to close the current tab page
 	  if tabpagenr('$') > 1
-	    let s .= '%=%#TabLine#%999Xclose'
+	    let s ..= '%=%#TabLine#%999Xclose'
 	  endif
 
 	  return s
@@ -461,14 +461,14 @@ windows in the tab page and a '+' if there is a modified buffer: >
 	  " Append the number of windows in the tab page if more than one
 	  let wincount = tabpagewinnr(v:lnum, '$')
 	  if wincount > 1
-	    let label .= wincount
+	    let label ..= wincount
 	  endif
 	  if label != ''
-	    let label .= ' '
+	    let label ..= ' '
 	  endif
 
 	  " Append the buffer name
-	  return label . bufname(bufnrlist[tabpagewinnr(v:lnum) - 1])
+	  return label .. bufname(bufnrlist[tabpagewinnr(v:lnum) - 1])
 	endfunction
 
 	set guitablabel=%{GuiTabLabel()}

runtime/doc/tags

@@ -1355,6 +1355,7 @@ $VIM_POSIX	vi_diff.txt	/*$VIM_POSIX*
 +mouse	various.txt	/*+mouse*
 +mouse_dec	various.txt	/*+mouse_dec*
 +mouse_gpm	various.txt	/*+mouse_gpm*
++mouse_gpm/dyn	various.txt	/*+mouse_gpm\/dyn*
 +mouse_jsbterm	various.txt	/*+mouse_jsbterm*
 +mouse_netterm	various.txt	/*+mouse_netterm*
 +mouse_pterm	various.txt	/*+mouse_pterm*
@@ -5861,6 +5862,7 @@ bug-fixes-5	version5.txt	/*bug-fixes-5*
 bug-fixes-6	version6.txt	/*bug-fixes-6*
 bug-fixes-7	version7.txt	/*bug-fixes-7*
 bug-fixes-8	version8.txt	/*bug-fixes-8*
+bug-fixes-9	version9.txt	/*bug-fixes-9*
 bug-reports	intro.txt	/*bug-reports*
 bugreport.vim	intro.txt	/*bugreport.vim*
 bugs	intro.txt	/*bugs*
@@ -6171,6 +6173,7 @@ compile-changes-5	version5.txt	/*compile-changes-5*
 compile-changes-6	version6.txt	/*compile-changes-6*
 compile-changes-7	version7.txt	/*compile-changes-7*
 compile-changes-8	version8.txt	/*compile-changes-8*
+compile-changes-9	version9.txt	/*compile-changes-9*
 compiler-compaqada	ft_ada.txt	/*compiler-compaqada*
 compiler-decada	ft_ada.txt	/*compiler-decada*
 compiler-gcc	quickfix.txt	/*compiler-gcc*
@@ -7820,6 +7823,7 @@ improvements-5	version5.txt	/*improvements-5*
 improvements-6	version6.txt	/*improvements-6*
 improvements-7	version7.txt	/*improvements-7*
 improvements-8	version8.txt	/*improvements-8*
+improvements-9	version9.txt	/*improvements-9*
 in_bot	channel.txt	/*in_bot*
 in_buf	channel.txt	/*in_buf*
 in_io-buffer	channel.txt	/*in_io-buffer*
@@ -7835,6 +7839,7 @@ incompatible-5	version5.txt	/*incompatible-5*
 incompatible-6	version6.txt	/*incompatible-6*
 incompatible-7	version7.txt	/*incompatible-7*
 incompatible-8	version8.txt	/*incompatible-8*
+incompatible-9	version9.txt	/*incompatible-9*
 indent()	builtin.txt	/*indent()*
 indent-expression	indent.txt	/*indent-expression*
 indent.txt	indent.txt	/*indent.txt*
@@ -8543,6 +8548,7 @@ new-5	version5.txt	/*new-5*
 new-6	version6.txt	/*new-6*
 new-7	version7.txt	/*new-7*
 new-8	version8.txt	/*new-8*
+new-9	version9.txt	/*new-9*
 new-GTK-GUI	version5.txt	/*new-GTK-GUI*
 new-MzScheme	version7.txt	/*new-MzScheme*
 new-Select-mode	version5.txt	/*new-Select-mode*
@@ -8576,6 +8582,7 @@ new-indent-flex	version6.txt	/*new-indent-flex*
 new-items-6	version6.txt	/*new-items-6*
 new-items-7	version7.txt	/*new-items-7*
 new-items-8	version8.txt	/*new-items-8*
+new-items-9	version9.txt	/*new-items-9*
 new-line-continuation	version5.txt	/*new-line-continuation*
 new-location-list	version7.txt	/*new-location-list*
 new-lua	version7.txt	/*new-lua*
@@ -8625,6 +8632,7 @@ new-utf-8	version6.txt	/*new-utf-8*
 new-vertsplit	version6.txt	/*new-vertsplit*
 new-vim-script	version7.txt	/*new-vim-script*
 new-vim-script-8	version8.txt	/*new-vim-script-8*
+new-vim-script-9	version9.txt	/*new-vim-script-9*
 new-vim-server	version6.txt	/*new-vim-server*
 new-vimgrep	version7.txt	/*new-vimgrep*
 new-vimscript-8.2	version8.txt	/*new-vimscript-8.2*
@@ -8743,7 +8751,8 @@ pascal.vim	syntax.txt	/*pascal.vim*
 patches-8	version8.txt	/*patches-8*
 patches-8.1	version8.txt	/*patches-8.1*
 patches-8.2	version8.txt	/*patches-8.2*
-patches-after-8.2	version8.txt	/*patches-after-8.2*
+patches-9	version9.txt	/*patches-9*
+patches-after-8.2	version9.txt	/*patches-after-8.2*
 pathshorten()	builtin.txt	/*pathshorten()*
 pattern	pattern.txt	/*pattern*
 pattern-atoms	pattern.txt	/*pattern-atoms*
@@ -10011,6 +10020,7 @@ terminal.txt	terminal.txt	/*terminal.txt*
 terminalprops()	builtin.txt	/*terminalprops()*
 terminfo	term.txt	/*terminfo*
 termresponse-variable	eval.txt	/*termresponse-variable*
+ternary	eval.txt	/*ternary*
 test-functions	usr_41.txt	/*test-functions*
 test-functions-details	testing.txt	/*test-functions-details*
 test_alloc_fail()	testing.txt	/*test_alloc_fail()*
@@ -10102,7 +10112,6 @@ tooltips	gui.txt	/*tooltips*
 toupper()	builtin.txt	/*toupper()*
 tr()	builtin.txt	/*tr()*
 trim()	builtin.txt	/*trim()*
-trinary	eval.txt	/*trinary*
 trojan-horse	starting.txt	/*trojan-horse*
 true	vim9.txt	/*true*
 true-variable	eval.txt	/*true-variable*
@@ -10457,6 +10466,7 @@ version-7.4	version7.txt	/*version-7.4*
 version-8.0	version8.txt	/*version-8.0*
 version-8.1	version8.txt	/*version-8.1*
 version-8.2	version8.txt	/*version-8.2*
+version-9.0	version9.txt	/*version-9.0*
 version-variable	eval.txt	/*version-variable*
 version4.txt	version4.txt	/*version4.txt*
 version5.txt	version5.txt	/*version5.txt*
@@ -10471,6 +10481,8 @@ version8.0	version8.txt	/*version8.0*
 version8.1	version8.txt	/*version8.1*
 version8.2	version8.txt	/*version8.2*
 version8.txt	version8.txt	/*version8.txt*
+version9.0	version9.txt	/*version9.0*
+version9.txt	version9.txt	/*version9.txt*
 versionlong-variable	eval.txt	/*versionlong-variable*
 vi	intro.txt	/*vi*
 vi-differences	vi_diff.txt	/*vi-differences*
@@ -10486,6 +10498,8 @@ vim-7.4	version7.txt	/*vim-7.4*
 vim-8	version8.txt	/*vim-8*
 vim-8.1	version8.txt	/*vim-8.1*
 vim-8.2	version8.txt	/*vim-8.2*
+vim-9	version9.txt	/*vim-9*
+vim-9.0	version9.txt	/*vim-9.0*
 vim-additions	vi_diff.txt	/*vim-additions*
 vim-announce	intro.txt	/*vim-announce*
 vim-arguments	starting.txt	/*vim-arguments*

runtime/doc/tagsrch.txt

@@ -724,7 +724,7 @@ matches the pattern "^# *define" it is not considered to be a comment.
 If you want to list matches, and then select one to jump to, you could use a
 mapping to do that for you.  Here is an example: >
 
-  :map <F4> [I:let nr = input("Which one: ")<Bar>exe "normal " . nr ."[\t"<CR>
+  :map <F4> [I:let nr = input("Which one: ")<Bar>exe "normal " .. nr .. "[\t"<CR>
 <
 							*[i*
 [i			Display the first line that contains the keyword

runtime/doc/term.txt

@@ -984,7 +984,7 @@ an #if/#else/#endif block, the selection becomes linewise.
 For MS-Windows and xterm the time for double clicking can be set with the
 'mousetime' option.  For the other systems this time is defined outside of Vim.
 An example, for using a double click to jump to the tag under the cursor: >
-	:map <2-LeftMouse> :exe "tag ". expand("<cword>")<CR>
+	:map <2-LeftMouse> :exe "tag " .. expand("<cword>")<CR>
 
 Dragging the mouse with a double click (button-down, button-up, button-down
 and then drag) will result in whole words to be selected.  This continues

runtime/doc/terminal.txt

@@ -979,8 +979,8 @@ Currently supported commands:
 <		Calls a function defined like this: >
 			function Tapi_Impression(bufnum, arglist)
 			  if len(a:arglist) == 2
-			    echomsg "impression " . a:arglist[0]
-			    echomsg "count " . a:arglist[1]
+			    echomsg "impression " .. a:arglist[0]
+			    echomsg "count " .. a:arglist[1]
 			  endif
 			endfunc
 <		Output from `:echo` may be erased by a redraw, use `:echomsg`

runtime/doc/tips.txt

@@ -101,14 +101,14 @@ What you need:
   create it with the shell command "mkid file1 file2 ..".
 
 Put this in your .vimrc: >
-	map _u :call ID_search()<Bar>execute "/\\<" . g:word . "\\>"<CR>
-	map _n :n<Bar>execute "/\\<" . g:word . "\\>"<CR>
+	map _u :call ID_search()<Bar>execute "/\\<" .. g:word .. "\\>"<CR>
+	map _n :n<Bar>execute "/\\<" .. g:word .. "\\>"<CR>
 
 	function! ID_search()
 	  let g:word = expand("<cword>")
-	  let x = system("lid --key=none ". g:word)
+	  let x = system("lid --key=none " .. g:word)
 	  let x = substitute(x, "\n", " ", "g")
-	  execute "next " . x
+	  execute "next " .. x
 	endfun
 
 To use it, place the cursor on a word, type "_u" and vim will load the file
@@ -356,13 +356,13 @@ This mapping will format any bullet list.  It requires that there is an empty
 line above and below each list entry.  The expression commands are used to
 be able to give comments to the parts of the mapping. >
 
-	:let m =     ":map _f  :set ai<CR>"    " need 'autoindent' set
-	:let m = m . "{O<Esc>"		      " add empty line above item
-	:let m = m . "}{)^W"		      " move to text after bullet
-	:let m = m . "i     <CR>     <Esc>"    " add space for indent
-	:let m = m . "gq}"		      " format text after the bullet
-	:let m = m . "{dd"		      " remove the empty line
-	:let m = m . "5lDJ"		      " put text after bullet
+	:let m =     ":map _f  :set ai<CR>"   " need 'autoindent' set
+	:let m ..= "{O<Esc>"		      " add empty line above item
+	:let m ..= "}{)^W"		      " move to text after bullet
+	:let m ..= "i     <CR>     <Esc>"     " add space for indent
+	:let m ..= "gq}"		      " format text after the bullet
+	:let m ..= "{dd"		      " remove the empty line
+	:let m ..= "5lDJ"		      " put text after bullet
 	:execute m			      |" define the mapping
 
 (<> notation |<>|.  Note that this is all typed literally.  ^W is "^" "W", not
@@ -514,15 +514,15 @@ A slightly more advanced version is used in the |matchparen| plugin.
 	    let c = '\['
 	    let c2 = '\]'
 	  endif
-	  let s_skip ='synIDattr(synID(line("."), col("."), 0), "name") ' .
+	  let s_skip ='synIDattr(synID(line("."), col("."), 0), "name") ' ..
 		\ '=~?	"string\\|comment"'
 	  execute 'if' s_skip '| let s_skip = 0 | endif'
 
 	  let [m_lnum, m_col] = searchpairpos(c, '', c2, s_flags, s_skip)
 
 	  if m_lnum > 0 && m_lnum >= line('w0') && m_lnum <= line('w$')
-	    exe 'match Search /\(\%' . c_lnum . 'l\%' . c_col .
-		  \ 'c\)\|\(\%' . m_lnum . 'l\%' . m_col . 'c\)/'
+	    exe 'match Search /\(\%' .. c_lnum .. 'l\%' .. c_col ..
+		  \ 'c\)\|\(\%' .. m_lnum .. 'l\%' .. m_col .. 'c\)/'
 	    let s:paren_hl_on = 1
 	  endif
 	endfunction

runtime/doc/undo.txt

@@ -286,12 +286,12 @@ history file.  E.g.: >
 	au BufReadPost * call ReadUndo()
 	au BufWritePost * call WriteUndo()
 	func ReadUndo()
-	  if filereadable(expand('%:h'). '/UNDO/' . expand('%:t'))
+	  if filereadable(expand('%:h') .. '/UNDO/' .. expand('%:t'))
 	    rundo %:h/UNDO/%:t
 	  endif
 	endfunc
 	func WriteUndo()
-	  let dirname = expand('%:h') . '/UNDO'
+	  let dirname = expand('%:h') .. '/UNDO'
 	  if !isdirectory(dirname)
 	    call mkdir(dirname)
 	  endif

runtime/doc/usr_05.txt

@@ -270,7 +270,7 @@ line break.  Revert with ":iunmap <C-U>".
 Enable using the mouse if available.  See 'mouse'.
 
 >
-	vnoremap _g y:exe "grep /" . escape(@", '\\/') . "/ *.c *.h"<CR>
+	vnoremap _g y:exe "grep /" .. escape(@", '\\/') .. "/ *.c *.h"<CR>
 
 This mapping yanks the visually selected text and searches for it in C files.
 You can see that a mapping can be used to do quite complicated things.  Still,

runtime/doc/various.txt

@@ -267,7 +267,7 @@ g8			Print the hex values of the bytes used in the
 			name does not contain a single quote: >
 				:!ls '%'
 <			This should always work, but it's more typing: >
-				:exe "!ls " . shellescape(expand("%"))
+				:exe "!ls " .. shellescape(expand("%"))
 <			To get a literal "%" or "#" prepend it with a
 			backslash.  For example, to list all files starting
 			with "%": >
@@ -650,7 +650,7 @@ N  *+X11*		Unix only: can restore window title |X11|
 			used.  In this example |:silent| is used to avoid the
 			message about reading the file and |:unsilent| to be
 			able to list the first line of each file. >
-		:silent argdo unsilent echo expand('%') . ": " . getline(1)
+		:silent argdo unsilent echo expand('%') .. ": " .. getline(1)
 <
 
 						*:verb* *:verbose*

runtime/doc/vim9.txt

@@ -1,4 +1,4 @@
-*vim9.txt*	For Vim version 8.2.  Last change: 2022 Feb 22
+*vim9.txt*	For Vim version 8.2.  Last change: 2022 Feb 23
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -229,8 +229,17 @@ script "export" needs to be used. >
 <						*E1058* *E1075*
 When using `:function` or `:def` to specify a nested function inside a `:def`
 function and no namespace was given, this nested function is local to the code
-block it is defined in.  It is not possible to define a script-local function.
-It is possible to define a global function by using the "g:" prefix.
+block it is defined in.  It cannot be used in `function()` with a string
+argument, pass the function reference itself: >
+	def Outer()
+	  def Inner()
+	    echo 'inner'
+	  enddef
+	  var Fok = function(Inner)     # OK
+	  var Fbad = function('Inner')  # does not work
+
+It is not possible to define a script-local function.  It is possible to
+define a global function by using the "g:" prefix.
 
 When referring to a function and no "s:" or "g:" prefix is used, Vim will
 search for the function:

runtime/doc/windows.txt

@@ -473,7 +473,7 @@ These commands can also be executed with ":wincmd":
 		the |CursorHold| autocommand event).  Or when a Normal mode
 		command is inconvenient.
 		The count can also be a window number.  Example: >
-			:exe nr . "wincmd w"
+			:exe nr .. "wincmd w"
 <		This goes to window "nr".
 
 ==============================================================================
@@ -964,12 +964,12 @@ CTRL-W g }						*CTRL-W_g}*
 		cursor.  This is less clever than using |:ptag|, but you don't
 		need a tags file and it will also find matches in system
 		include files.  Example: >
-  :au! CursorHold *.[ch] ++nested exe "silent! psearch " . expand("<cword>")
+  :au! CursorHold *.[ch] ++nested exe "silent! psearch " .. expand("<cword>")
 <		Warning: This can be slow.
 
 Example						*CursorHold-example*  >
 
-  :au! CursorHold *.[ch] ++nested exe "silent! ptag " . expand("<cword>")
+  :au! CursorHold *.[ch] ++nested exe "silent! ptag " .. expand("<cword>")
 
 This will cause a ":ptag" to be executed for the keyword under the cursor,
 when the cursor hasn't moved for the time set with 'updatetime'.  The "nested"
@@ -992,14 +992,14 @@ is no word under the cursor, and a few other things: >
   :
   :    " Delete any existing highlight before showing another tag
   :    silent! wincmd P			" jump to preview window
-  :    if &previewwindow			" if we really get there...
+  :    if &previewwindow		" if we really get there...
   :      match none			" delete existing highlight
   :      wincmd p			" back to old window
   :    endif
   :
   :    " Try displaying a matching tag for the word under the cursor
   :    try
-  :       exe "ptag " . w
+  :       exe "ptag " .. w
   :    catch
   :      return
   :    endtry
@@ -1011,10 +1011,10 @@ is no word under the cursor, and a few other things: >
   :	 endif
   :	 call search("$", "b")		" to end of previous line
   :	 let w = substitute(w, '\\', '\\\\', "")
-  :	 call search('\<\V' . w . '\>')	" position cursor on match
+  :	 call search('\<\V' .. w .. '\>')	" position cursor on match
   :	 " Add a match highlight to the word at this position
   :      hi previewWord term=bold ctermbg=green guibg=green
-  :	 exe 'match previewWord "\%' . line(".") . 'l\%' . col(".") . 'c\k*"'
+  :	 exe 'match previewWord "\%' .. line(".") .. 'l\%' .. col(".") .. 'c\k*"'
   :      wincmd p			" back to old window
   :    endif
   :  endif

runtime/indent/vim.vim

@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:	Vim script
 " Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2021 Nov 27
+" Last Change:	2022 Feb 23
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -10,7 +10,7 @@ endif
 let b:did_indent = 1
 
 setlocal indentexpr=GetVimIndent()
-setlocal indentkeys+==end,=},=else,=cat,=finall,=END,0\\,0=\"\\\ 
+setlocal indentkeys+==endif,=enddef,=endfu,=endfor,=endwh,=endtry,=},=else,=cat,=finall,=END,0\\,0=\"\\\ 
 setlocal indentkeys-=0#
 setlocal indentkeys-=:
 
@@ -103,8 +103,9 @@ function GetVimIndentIntern()
     " A line starting with :au does not increment/decrement indent.
     " A { may start a block or a dict.  Assume that when a } follows it's a
     " terminated dict.
+    " ":function" starts a block but "function(" doesn't.
     if prev_text !~ '^\s*au\%[tocmd]' && prev_text !~ '^\s*{.*}'
-      let i = match(prev_text, '\(^\||\)\s*\(export\s\+\)\?\({\|\(if\|wh\%[ile]\|for\|try\|cat\%[ch]\|fina\|finall\%[y]\|fu\%[nction]\|def\|el\%[seif]\)\>\)')
+      let i = match(prev_text, '\(^\||\)\s*\(export\s\+\)\?\({\|\(if\|wh\%[ile]\|for\|try\|cat\%[ch]\|fina\|finall\%[y]\|def\|el\%[seif]\)\>\|fu\%[nction]\s\)')
       if i >= 0
 	let ind += shiftwidth()
 	if strpart(prev_text, i, 1) == '|' && has('syntax_items')
@@ -170,10 +171,15 @@ function GetVimIndentIntern()
     let ind = ind + shiftwidth()
   endif
 
-  " Subtract a 'shiftwidth' on a :endif, :endwhile, :catch, :finally, :endtry,
-  " :endfun, :enddef, :else and :augroup END.
-  if cur_text =~ '^\s*\(ene\@!\|cat\|finall\|el\|aug\%[roup]\s\+[eE][nN][dD]\)'
+  " Subtract a 'shiftwidth' on a :endif, :endwhile, :endfor, :catch, :finally,
+  " :endtry, :endfun, :enddef, :else and :augroup END.
+  " Although ":en" would be enough only match short command names as in
+  " 'indentkeys'.
+  if cur_text =~ '^\s*\(endif\|endwh\|endfor\|endtry\|endfu\|enddef\|cat\|finall\|else\|aug\%[roup]\s\+[eE][nN][dD]\)'
     let ind = ind - shiftwidth()
+    if ind < 0
+      let ind = 0
+    endif
   endif
 
   return ind

src/buffer.c

@@ -2814,38 +2814,39 @@ ExpandBufnames(
 		    }
 		}
 
-		if (p != NULL)
-		{
-		    if (round == 1)
-			++count;
-		    else
-		    {
-			if (options & WILD_HOME_REPLACE)
-			    p = home_replace_save(buf, p);
-			else
-			    p = vim_strsave(p);
+		if (p == NULL)
+		    continue;
 
-			if (!fuzzy)
-			{
+		if (round == 1)
+		{
+		    ++count;
+		    continue;
+		}
+
+		if (options & WILD_HOME_REPLACE)
+		    p = home_replace_save(buf, p);
+		else
+		    p = vim_strsave(p);
+
+		if (!fuzzy)
+		{
 #ifdef FEAT_VIMINFO
-			    if (matches != NULL)
-			    {
-				matches[count].buf = buf;
-				matches[count].match = p;
-				count++;
-			    }
-			    else
-#endif
-				(*file)[count++] = p;
-			}
-			else
-			{
-			    fuzmatch[count].idx = count;
-			    fuzmatch[count].str = p;
-			    fuzmatch[count].score = score;
-			    count++;
-			}
+		    if (matches != NULL)
+		    {
+			matches[count].buf = buf;
+			matches[count].match = p;
+			count++;
 		    }
+		    else
+#endif
+			(*file)[count++] = p;
+		}
+		else
+		{
+		    fuzmatch[count].idx = count;
+		    fuzmatch[count].str = p;
+		    fuzmatch[count].score = score;
+		    count++;
 		}
 	    }
 	    if (count == 0)	// no match found, break here

src/cmdexpand.c

@@ -16,15 +16,14 @@
 static int	cmd_showtail;	// Only show path tail in lists ?
 
 static void	set_expand_context(expand_T *xp);
-static int      ExpandGeneric(expand_T *xp, regmatch_T *regmatch,
+static int      ExpandGeneric(char_u *pat, expand_T *xp, regmatch_T *regmatch,
 			      char_u ***matches, int *numMatches,
-			      char_u *((*func)(expand_T *, int)), int escaped,
-			      char_u *fuzzystr);
+			      char_u *((*func)(expand_T *, int)), int escaped);
 static int	ExpandFromContext(expand_T *xp, char_u *, char_u ***, int *, int);
 static int	expand_showtail(expand_T *xp);
 static int	expand_shellcmd(char_u *filepat, char_u ***matches, int *numMatches, int flagsarg);
 #if defined(FEAT_EVAL)
-static int	ExpandUserDefined(expand_T *xp, regmatch_T *regmatch, char_u ***matches, int *numMatches);
+static int	ExpandUserDefined(char_u *pat, expand_T *xp, regmatch_T *regmatch, char_u ***matches, int *numMatches);
 static int	ExpandUserList(expand_T *xp, char_u ***matches, int *numMatches);
 #endif
 
@@ -56,20 +55,19 @@ cmdline_fuzzy_completion_supported(expand_T *xp)
 	    && xp->xp_context != EXPAND_FILES_IN_PATH
 	    && xp->xp_context != EXPAND_FILETYPE
 	    && xp->xp_context != EXPAND_HELP
-	    && xp->xp_context != EXPAND_MAPPINGS
 	    && xp->xp_context != EXPAND_OLD_SETTING
 	    && xp->xp_context != EXPAND_OWNSYNTAX
 	    && xp->xp_context != EXPAND_PACKADD
 	    && xp->xp_context != EXPAND_SHELLCMD
 	    && xp->xp_context != EXPAND_TAGS
 	    && xp->xp_context != EXPAND_TAGS_LISTFILES
-	    && xp->xp_context != EXPAND_USER_DEFINED
 	    && xp->xp_context != EXPAND_USER_LIST);
 }
 
 /*
  * Returns TRUE if fuzzy completion for cmdline completion is enabled and
- * 'fuzzystr' is not empty.
+ * 'fuzzystr' is not empty.  If search pattern is empty, then don't use fuzzy
+ * matching.
  */
     int
 cmdline_fuzzy_complete(char_u *fuzzystr)
@@ -378,9 +376,13 @@ int cmdline_pum_active(void)
  */
 void cmdline_pum_remove(void)
 {
+    int save_p_lz = p_lz;
+
     pum_undisplay();
     VIM_CLEAR(compl_match_array);
+    p_lz = FALSE;  // avoid the popup menu hanging around
     update_screen(0);
+    p_lz = save_p_lz;
     redrawcmd();
 }
 
@@ -1216,10 +1218,12 @@ set_cmd_index(char_u *cmd, exarg_T *eap, expand_T *xp, int *complp)
 
     // Isolate the command and search for it in the command table.
     // Exceptions:
-    // - the 'k' command can directly be followed by any character, but
-    //   do accept "keepmarks", "keepalt" and "keepjumps".
+    // - the 'k' command can directly be followed by any character, but do
+    // accept "keepmarks", "keepalt" and "keepjumps". As fuzzy matching can
+    // find matches anywhere in the command name, do this only for command
+    // expansion based on regular expression and not for fuzzy matching.
     // - the 's' command can be followed directly by 'c', 'g', 'i', 'I' or 'r'
-    if (*cmd == 'k' && cmd[1] != 'e')
+    if (!fuzzy && (*cmd == 'k' && cmd[1] != 'e'))
     {
 	eap->cmdidx = CMD_k;
 	p = cmd + 1;
@@ -2370,7 +2374,7 @@ get_mapclear_arg(expand_T *xp UNUSED, int idx)
     static int
 ExpandOther(
 	char_u		*pat,
-	expand_T	*xp, 
+	expand_T	*xp,
 	regmatch_T	*rmp,
 	char_u		***matches,
 	int		*numMatches)
@@ -2439,16 +2443,10 @@ ExpandOther(
     {
 	if (xp->xp_context == tab[i].context)
 	{
-	    // Use fuzzy matching if 'wildoptions' has 'fuzzy'.
-	    // If no search pattern is supplied, then don't use fuzzy
-	    // matching and return all the found items.
-	    int fuzzy = cmdline_fuzzy_complete(pat);
-
 	    if (tab[i].ic)
 		rmp->rm_ic = TRUE;
-	    ret = ExpandGeneric(xp, rmp, matches, numMatches,
-						tab[i].func, tab[i].escaped,
-						fuzzy ? pat : NULL);
+	    ret = ExpandGeneric(pat, xp, rmp, matches, numMatches,
+						tab[i].func, tab[i].escaped);
 	    break;
 	}
     }
@@ -2496,7 +2494,8 @@ ExpandFromContext(
     int		ret;
     int		flags;
     char_u	*tofree = NULL;
-    int		fuzzy = cmdline_fuzzy_complete(pat);
+    int		fuzzy = cmdline_fuzzy_complete(pat)
+				     && cmdline_fuzzy_completion_supported(xp);
 
     flags = map_wildopts_to_ewflags(options);
 
@@ -2595,10 +2594,10 @@ ExpandFromContext(
 	    || xp->xp_context == EXPAND_BOOL_SETTINGS)
 	ret = ExpandSettings(xp, &regmatch, pat, numMatches, matches);
     else if (xp->xp_context == EXPAND_MAPPINGS)
-	ret = ExpandMappings(&regmatch, numMatches, matches);
+	ret = ExpandMappings(pat, &regmatch, numMatches, matches);
 # if defined(FEAT_EVAL)
     else if (xp->xp_context == EXPAND_USER_DEFINED)
-	ret = ExpandUserDefined(xp, &regmatch, matches, numMatches);
+	ret = ExpandUserDefined(pat, xp, &regmatch, matches, numMatches);
 # endif
     else
 	ret = ExpandOther(pat, xp, &regmatch, matches, numMatches);
@@ -2624,123 +2623,144 @@ ExpandFromContext(
  */
     static int
 ExpandGeneric(
+    char_u	*pat,
     expand_T	*xp,
     regmatch_T	*regmatch,
     char_u	***matches,
     int		*numMatches,
     char_u	*((*func)(expand_T *, int)),
 					  // returns a string from the list
-    int		escaped,
-    char_u	*fuzzystr)
+    int		escaped)
 {
     int		i;
-    int		count = 0;
-    int		round;
+    garray_T	ga;
     char_u	*str;
     fuzmatch_str_T	*fuzmatch = NULL;
-    int			score = 0;
-    int		fuzzy = (fuzzystr != NULL);
-    int		funcsort = FALSE;
+    int		score = 0;
+    int		fuzzy;
     int		match;
 
-    // do this loop twice:
-    // round == 0: count the number of matching names
-    // round == 1: copy the matching names into allocated memory
-    for (round = 0; round <= 1; ++round)
-    {
-	for (i = 0; ; ++i)
-	{
-	    str = (*func)(xp, i);
-	    if (str == NULL)	    // end of list
-		break;
-	    if (*str == NUL)	    // skip empty strings
-		continue;
+    fuzzy = cmdline_fuzzy_complete(pat);
+    *matches = NULL;
+    *numMatches = 0;
 
+    if (!fuzzy)
+	ga_init2(&ga, sizeof(char *), 30);
+    else
+	ga_init2(&ga, sizeof(fuzmatch_str_T), 30);
+
+    for (i = 0; ; ++i)
+    {
+	str = (*func)(xp, i);
+	if (str == NULL)	    // end of list
+	    break;
+	if (*str == NUL)	    // skip empty strings
+	    continue;
+
+	if (xp->xp_pattern[0] != NUL)
+	{
 	    if (!fuzzy)
-	       match = vim_regexec(regmatch, str, (colnr_T)0);
+		match = vim_regexec(regmatch, str, (colnr_T)0);
 	    else
 	    {
-		score = fuzzy_match_str(str, fuzzystr);
+		score = fuzzy_match_str(str, pat);
 		match = (score != 0);
 	    }
-
-	    if (!match)
-		continue;
-
-	    if (round)
-	    {
-		if (escaped)
-		    str = vim_strsave_escaped(str, (char_u *)" \t\\.");
-		else
-		    str = vim_strsave(str);
-		if (str == NULL)
-		{
-		    if (fuzzy)
-			fuzmatch_str_free(fuzmatch, count);
-		    else if (count > 0)
-			FreeWild(count, *matches);
-		    *numMatches = 0;
-		    *matches = NULL;
-		    return FAIL;
-		}
-		if (fuzzy)
-		{
-		    fuzmatch[count].idx = count;
-		    fuzmatch[count].str = str;
-		    fuzmatch[count].score = score;
-		}
-		else
-		    (*matches)[count] = str;
-# ifdef FEAT_MENU
-		if (func == get_menu_names && str != NULL)
-		{
-		    // test for separator added by get_menu_names()
-		    str += STRLEN(str) - 1;
-		    if (*str == '\001')
-			*str = '.';
-		}
-# endif
-	    }
-	    ++count;
 	}
-	if (round == 0)
+	else
+	    match = TRUE;
+
+	if (!match)
+	    continue;
+
+	if (escaped)
+	    str = vim_strsave_escaped(str, (char_u *)" \t\\.");
+	else
+	    str = vim_strsave(str);
+	if (str == NULL)
 	{
-	    if (count == 0)
-		return OK;
-	    if (fuzzy)
-		fuzmatch = ALLOC_MULT(fuzmatch_str_T, count);
-	    else
-		*matches = ALLOC_MULT(char_u *, count);
-	    if ((fuzzy && (fuzmatch == NULL)) || (*matches == NULL))
+	    if (!fuzzy)
 	    {
-		*numMatches = 0;
-		*matches = NULL;
+		ga_clear_strings(&ga);
 		return FAIL;
 	    }
-	    *numMatches = count;
-	    count = 0;
+
+	    for (i = 0; i < ga.ga_len; ++i)
+	    {
+		fuzmatch = &((fuzmatch_str_T *)ga.ga_data)[i];
+		vim_free(fuzmatch->str);
+	    }
+	    ga_clear(&ga);
+	    return FAIL;
 	}
+
+	if (ga_grow(&ga, 1) == FAIL)
+	{
+	    vim_free(str);
+	    break;
+	}
+
+	if (fuzzy)
+	{
+	    fuzmatch = &((fuzmatch_str_T *)ga.ga_data)[ga.ga_len];
+	    fuzmatch->idx = ga.ga_len;
+	    fuzmatch->str = str;
+	    fuzmatch->score = score;
+	}
+	else
+	    ((char_u **)ga.ga_data)[ga.ga_len] = str;
+
+# ifdef FEAT_MENU
+	if (func == get_menu_names)
+	{
+	    // test for separator added by get_menu_names()
+	    str += STRLEN(str) - 1;
+	    if (*str == '\001')
+		*str = '.';
+	}
+# endif
+
+	++ga.ga_len;
     }
 
+    if (ga.ga_len == 0)
+	return OK;
+
     // Sort the results.  Keep menu's in the specified order.
-    if (xp->xp_context != EXPAND_MENUNAMES && xp->xp_context != EXPAND_MENUS)
+    if (!fuzzy && xp->xp_context != EXPAND_MENUNAMES
+					&& xp->xp_context != EXPAND_MENUS)
     {
 	if (xp->xp_context == EXPAND_EXPRESSION
 		|| xp->xp_context == EXPAND_FUNCTIONS
 		|| xp->xp_context == EXPAND_USER_FUNC
 		|| xp->xp_context == EXPAND_DISASSEMBLE)
-	{
+	    // <SNR> functions should be sorted to the end.
+	    qsort((void *)ga.ga_data, (size_t)ga.ga_len, sizeof(char_u *),
+							   sort_func_compare);
+	else
+	    sort_strings((char_u **)ga.ga_data, ga.ga_len);
+    }
+
+    if (!fuzzy)
+    {
+	*matches = ga.ga_data;
+	*numMatches = ga.ga_len;
+    }
+    else
+    {
+	int	funcsort = FALSE;
+
+	if (xp->xp_context == EXPAND_EXPRESSION
+		|| xp->xp_context == EXPAND_FUNCTIONS
+		|| xp->xp_context == EXPAND_USER_FUNC
+		|| xp->xp_context == EXPAND_DISASSEMBLE)
 	    // <SNR> functions should be sorted to the end.
 	    funcsort = TRUE;
-	    if (!fuzzy)
-		qsort((void *)*matches, (size_t)*numMatches, sizeof(char_u *),
-							   sort_func_compare);
-	}
-	else
-	{
-	    if (!fuzzy)
-		sort_strings(*matches, *numMatches);
-	}
+
+	if (fuzzymatches_to_strmatches(ga.ga_data, matches, ga.ga_len,
+							funcsort) == FAIL)
+	    return FAIL;
+	*numMatches = ga.ga_len;
     }
 
 #if defined(FEAT_SYN_HL)
@@ -2749,10 +2769,6 @@ ExpandGeneric(
     reset_expand_highlight();
 #endif
 
-    if (fuzzy && fuzzymatches_to_strmatches(fuzmatch, matches, count,
-							funcsort) == FAIL)
-	return FAIL;
-
     return OK;
 }
 
@@ -2969,10 +2985,12 @@ call_user_expand_func(
 }
 
 /*
- * Expand names with a function defined by the user.
+ * Expand names with a function defined by the user (EXPAND_USER_DEFINED and
+ * EXPAND_USER_LIST).
  */
     static int
 ExpandUserDefined(
+    char_u	*pat,
     expand_T	*xp,
     regmatch_T	*regmatch,
     char_u	***matches,
@@ -2983,15 +3001,23 @@ ExpandUserDefined(
     char_u	*e;
     int		keep;
     garray_T	ga;
-    int		skip;
+    int		fuzzy;
+    int		match;
+    int		score = 0;
 
+    fuzzy = cmdline_fuzzy_complete(pat);
     *matches = NULL;
     *numMatches = 0;
+
     retstr = call_user_expand_func(call_func_retstr, xp);
     if (retstr == NULL)
 	return FAIL;
 
-    ga_init2(&ga, sizeof(char *), 3);
+    if (!fuzzy)
+	ga_init2(&ga, sizeof(char *), 3);
+    else
+	ga_init2(&ga, sizeof(fuzmatch_str_T), 3);
+
     for (s = retstr; *s != NUL; s = e)
     {
 	e = vim_strchr(s, '\n');
@@ -3000,14 +3026,35 @@ ExpandUserDefined(
 	keep = *e;
 	*e = NUL;
 
-	skip = xp->xp_pattern[0] && vim_regexec(regmatch, s, (colnr_T)0) == 0;
+	if (xp->xp_pattern[0] != NUL)
+	{
+	    if (!fuzzy)
+		match = vim_regexec(regmatch, s, (colnr_T)0);
+	    else
+	    {
+		score = fuzzy_match_str(s, pat);
+		match = (score != 0);
+	    }
+	}
+	else
+	    match = TRUE;		// match everything
+
 	*e = keep;
 
-	if (!skip)
+	if (match)
 	{
 	    if (ga_grow(&ga, 1) == FAIL)
 		break;
-	    ((char_u **)ga.ga_data)[ga.ga_len] = vim_strnsave(s, e - s);
+	    if (!fuzzy)
+		((char_u **)ga.ga_data)[ga.ga_len] = vim_strnsave(s, e - s);
+	    else
+	    {
+		fuzmatch_str_T  *fuzmatch =
+				&((fuzmatch_str_T  *)ga.ga_data)[ga.ga_len];
+		fuzmatch->idx = ga.ga_len;
+		fuzmatch->str = vim_strnsave(s, e - s);
+		fuzmatch->score = score;
+	    }
 	    ++ga.ga_len;
 	}
 
@@ -3015,8 +3062,22 @@ ExpandUserDefined(
 	    ++e;
     }
     vim_free(retstr);
-    *matches = ga.ga_data;
-    *numMatches = ga.ga_len;
+
+    if (ga.ga_len == 0)
+	return OK;
+
+    if (!fuzzy)
+    {
+	*matches = ga.ga_data;
+	*numMatches = ga.ga_len;
+    }
+    else
+    {
+	if (fuzzymatches_to_strmatches(ga.ga_data, matches, ga.ga_len,
+								FALSE) == FAIL)
+	    return FAIL;
+	*numMatches = ga.ga_len;
+    }
     return OK;
 }
 

src/evalvars.c

@@ -2816,29 +2816,33 @@ eval_variable(
 	    }
 
 	    // If a list or dict variable wasn't initialized, do it now.
-	    if (tv->v_type == VAR_DICT && tv->vval.v_dict == NULL)
+	    // Not for global variables, they are not declared.
+	    if (ht != &globvarht)
 	    {
-		tv->vval.v_dict = dict_alloc();
-		if (tv->vval.v_dict != NULL)
+		if (tv->v_type == VAR_DICT && tv->vval.v_dict == NULL)
 		{
-		    ++tv->vval.v_dict->dv_refcount;
-		    tv->vval.v_dict->dv_type = alloc_type(type);
+		    tv->vval.v_dict = dict_alloc();
+		    if (tv->vval.v_dict != NULL)
+		    {
+			++tv->vval.v_dict->dv_refcount;
+			tv->vval.v_dict->dv_type = alloc_type(type);
+		    }
 		}
-	    }
-	    else if (tv->v_type == VAR_LIST && tv->vval.v_list == NULL)
-	    {
-		tv->vval.v_list = list_alloc();
-		if (tv->vval.v_list != NULL)
+		else if (tv->v_type == VAR_LIST && tv->vval.v_list == NULL)
 		{
-		    ++tv->vval.v_list->lv_refcount;
-		    tv->vval.v_list->lv_type = alloc_type(type);
+		    tv->vval.v_list = list_alloc();
+		    if (tv->vval.v_list != NULL)
+		    {
+			++tv->vval.v_list->lv_refcount;
+			tv->vval.v_list->lv_type = alloc_type(type);
+		    }
+		}
+		else if (tv->v_type == VAR_BLOB && tv->vval.v_blob == NULL)
+		{
+		    tv->vval.v_blob = blob_alloc();
+		    if (tv->vval.v_blob != NULL)
+			++tv->vval.v_blob->bv_refcount;
 		}
-	    }
-	    else if (tv->v_type == VAR_BLOB && tv->vval.v_blob == NULL)
-	    {
-		tv->vval.v_blob = blob_alloc();
-		if (tv->vval.v_blob != NULL)
-		    ++tv->vval.v_blob->bv_refcount;
 	    }
 	    copy_tv(tv, rettv);
 	}

src/gui_w32.c

@@ -3016,7 +3016,7 @@ is_point_onscreen(int x, int y)
 }
 
 /*
- * Check if the whole area of the specified window is on-screen.
+ * Check if the whole client area of the specified window is on-screen.
  *
  * Note about DirectX: Windows 10 1809 or above no longer maintains image of
  * the window portion that is off-screen.  Scrolling by DWriteContext_Scroll()
@@ -3026,16 +3026,23 @@ is_point_onscreen(int x, int y)
 is_window_onscreen(HWND hwnd)
 {
     RECT    rc;
+    POINT   p1, p2;
 
-    GetWindowRect(hwnd, &rc);
+    GetClientRect(hwnd, &rc);
+    p1.x = rc.left;
+    p1.y = rc.top;
+    p2.x = rc.right - 1;
+    p2.y = rc.bottom - 1;
+    ClientToScreen(hwnd, &p1);
+    ClientToScreen(hwnd, &p2);
 
-    if (!is_point_onscreen(rc.left, rc.top))
+    if (!is_point_onscreen(p1.x, p1.y))
 	return FALSE;
-    if (!is_point_onscreen(rc.left, rc.bottom))
+    if (!is_point_onscreen(p1.x, p2.y))
 	return FALSE;
-    if (!is_point_onscreen(rc.right, rc.top))
+    if (!is_point_onscreen(p2.x, p1.y))
 	return FALSE;
-    if (!is_point_onscreen(rc.right, rc.bottom))
+    if (!is_point_onscreen(p2.x, p2.y))
 	return FALSE;
     return TRUE;
 }

src/map.c

@@ -1257,101 +1257,154 @@ set_context_in_map_cmd(
  */
     int
 ExpandMappings(
+    char_u	*pat,
     regmatch_T	*regmatch,
-    int		*num_file,
-    char_u	***file)
+    int		*numMatches,
+    char_u	***matches)
 {
     mapblock_T	*mp;
+    garray_T	ga;
     int		hash;
     int		count;
-    int		round;
     char_u	*p;
     int		i;
+    int		fuzzy;
+    int		match;
+    int		score;
+    fuzmatch_str_T  *fuzmatch;
+
+    fuzzy = cmdline_fuzzy_complete(pat);
 
     validate_maphash();
 
-    *num_file = 0;		    // return values in case of FAIL
-    *file = NULL;
+    *numMatches = 0;		    // return values in case of FAIL
+    *matches = NULL;
 
-    // round == 1: Count the matches.
-    // round == 2: Build the array to keep the matches.
-    for (round = 1; round <= 2; ++round)
+    if (!fuzzy)
+	ga_init2(&ga, sizeof(char *), 3);
+    else
+	ga_init2(&ga, sizeof(fuzmatch_str_T), 3);
+
+    // First search in map modifier arguments
+    for (i = 0; i < 7; ++i)
     {
-	count = 0;
-
-	for (i = 0; i < 7; ++i)
-	{
-	    if (i == 0)
-		p = (char_u *)"<silent>";
-	    else if (i == 1)
-		p = (char_u *)"<unique>";
+	if (i == 0)
+	    p = (char_u *)"<silent>";
+	else if (i == 1)
+	    p = (char_u *)"<unique>";
 #ifdef FEAT_EVAL
-	    else if (i == 2)
-		p = (char_u *)"<script>";
-	    else if (i == 3)
-		p = (char_u *)"<expr>";
+	else if (i == 2)
+	    p = (char_u *)"<script>";
+	else if (i == 3)
+	    p = (char_u *)"<expr>";
 #endif
-	    else if (i == 4 && !expand_buffer)
-		p = (char_u *)"<buffer>";
-	    else if (i == 5)
-		p = (char_u *)"<nowait>";
-	    else if (i == 6)
-		p = (char_u *)"<special>";
-	    else
+	else if (i == 4 && !expand_buffer)
+	    p = (char_u *)"<buffer>";
+	else if (i == 5)
+	    p = (char_u *)"<nowait>";
+	else if (i == 6)
+	    p = (char_u *)"<special>";
+	else
+	    continue;
+
+	if (!fuzzy)
+	    match = vim_regexec(regmatch, p, (colnr_T)0);
+	else
+	{
+	    score = fuzzy_match_str(p, pat);
+	    match = (score != 0);
+	}
+
+	if (!match)
+	    continue;
+
+	if (ga_grow(&ga, 1) == FAIL)
+	    break;
+
+	if (fuzzy)
+	{
+	    fuzmatch = &((fuzmatch_str_T *)ga.ga_data)[ga.ga_len];
+	    fuzmatch->idx = ga.ga_len;
+	    fuzmatch->str = vim_strsave(p);
+	    fuzmatch->score = score;
+	}
+	else
+	    ((char_u **)ga.ga_data)[ga.ga_len] = vim_strsave(p);
+	++ga.ga_len;
+    }
+
+    for (hash = 0; hash < 256; ++hash)
+    {
+	if (expand_isabbrev)
+	{
+	    if (hash > 0)	// only one abbrev list
+		break; // for (hash)
+	    mp = first_abbr;
+	}
+	else if (expand_buffer)
+	    mp = curbuf->b_maphash[hash];
+	else
+	    mp = maphash[hash];
+	for (; mp; mp = mp->m_next)
+	{
+	    if (!(mp->m_mode & expand_mapmodes))
 		continue;
 
-	    if (vim_regexec(regmatch, p, (colnr_T)0))
-	    {
-		if (round == 1)
-		    ++count;
-		else
-		    (*file)[count++] = vim_strsave(p);
-	    }
-	}
+	    p = translate_mapping(mp->m_keys);
+	    if (p == NULL)
+		continue;
 
-	for (hash = 0; hash < 256; ++hash)
-	{
-	    if (expand_isabbrev)
-	    {
-		if (hash > 0)	// only one abbrev list
-		    break; // for (hash)
-		mp = first_abbr;
-	    }
-	    else if (expand_buffer)
-		mp = curbuf->b_maphash[hash];
+	    if (!fuzzy)
+		match = vim_regexec(regmatch, p, (colnr_T)0);
 	    else
-		mp = maphash[hash];
-	    for (; mp; mp = mp->m_next)
 	    {
-		if (mp->m_mode & expand_mapmodes)
-		{
-		    p = translate_mapping(mp->m_keys);
-		    if (p != NULL && vim_regexec(regmatch, p, (colnr_T)0))
-		    {
-			if (round == 1)
-			    ++count;
-			else
-			{
-			    (*file)[count++] = p;
-			    p = NULL;
-			}
-		    }
-		    vim_free(p);
-		}
-	    } // for (mp)
-	} // for (hash)
+		score = fuzzy_match_str(p, pat);
+		match = (score != 0);
+	    }
 
-	if (count == 0)			// no match found
-	    break; // for (round)
+	    if (!match)
+	    {
+		vim_free(p);
+		continue;
+	    }
 
-	if (round == 1)
-	{
-	    *file = ALLOC_MULT(char_u *, count);
-	    if (*file == NULL)
-		return FAIL;
-	}
-    } // for (round)
+	    if (ga_grow(&ga, 1) == FAIL)
+	    {
+		vim_free(p);
+		break;
+	    }
 
+	    if (fuzzy)
+	    {
+		fuzmatch = &((fuzmatch_str_T *)ga.ga_data)[ga.ga_len];
+		fuzmatch->idx = ga.ga_len;
+		fuzmatch->str = p;
+		fuzmatch->score = score;
+	    }
+	    else
+		((char_u **)ga.ga_data)[ga.ga_len] = p;
+
+	    ++ga.ga_len;
+	} // for (mp)
+    } // for (hash)
+
+    if (ga.ga_len == 0)
+	return FAIL;
+
+    if (!fuzzy)
+    {
+	*matches = ga.ga_data;
+	*numMatches = ga.ga_len;
+    }
+    else
+    {
+	if (fuzzymatches_to_strmatches(ga.ga_data, matches, ga.ga_len,
+							FALSE) == FAIL)
+	    return FAIL;
+	*numMatches = ga.ga_len;
+    }
+
+    count = *numMatches;
     if (count > 1)
     {
 	char_u	**ptr1;
@@ -1359,10 +1412,12 @@ ExpandMappings(
 	char_u	**ptr3;
 
 	// Sort the matches
-	sort_strings(*file, count);
+	// Fuzzy matching already sorts the matches
+	if (!fuzzy)
+	    sort_strings(*matches, count);
 
 	// Remove multiple entries
-	ptr1 = *file;
+	ptr1 = *matches;
 	ptr2 = ptr1 + 1;
 	ptr3 = ptr1 + count;
 
@@ -1378,7 +1433,7 @@ ExpandMappings(
 	}
     }
 
-    *num_file = count;
+    *numMatches = count;
     return (count == 0 ? FAIL : OK);
 }
 

src/os_unix.c

@@ -887,8 +887,10 @@ sig_tstp SIGDEFARG(sigarg)
     else
 	got_tstp = TRUE;
 
-    // this is not required on all systems, but it doesn't hurt anybody
+#ifndef __ANDROID__
+    // this is not required on all systems
     signal(SIGTSTP, (RETSIGTYPE (*)())sig_tstp);
+#endif
     SIGRETURN;
 }
 #endif

src/proto/map.pro

@@ -8,7 +8,7 @@ int mode_str2flags(char_u *modechars);
 int map_to_exists(char_u *str, char_u *modechars, int abbr);
 int map_to_exists_mode(char_u *rhs, int mode, int abbr);
 char_u *set_context_in_map_cmd(expand_T *xp, char_u *cmd, char_u *arg, int forceit, int isabbrev, int isunmap, cmdidx_T cmdidx);
-int ExpandMappings(regmatch_T *regmatch, int *num_file, char_u ***file);
+int ExpandMappings(char_u *pat, regmatch_T *regmatch, int *num_file, char_u ***file);
 int check_abbr(int c, char_u *ptr, int col, int mincol);
 char_u *eval_map_expr(mapblock_T *mp, int c);
 char_u *vim_strsave_escape_csi(char_u *p);

src/proto/typval.pro

@@ -57,6 +57,7 @@ int tv_check_lock(typval_T *tv, char_u *name, int use_gettext);
 void copy_tv(typval_T *from, typval_T *to);
 int typval_compare(typval_T *tv1, typval_T *tv2, exprtype_T type, int ic);
 int typval_compare_list(typval_T *tv1, typval_T *tv2, exprtype_T type, int ic, int *res);
+int typval_compare_null(typval_T *tv1, typval_T *tv2);
 int typval_compare_blob(typval_T *tv1, typval_T *tv2, exprtype_T type, int *res);
 int typval_compare_dict(typval_T *tv1, typval_T *tv2, exprtype_T type, int ic, int *res);
 int typval_compare_func(typval_T *tv1, typval_T *tv2, exprtype_T type, int ic, int *res);

src/search.c

@@ -5006,7 +5006,7 @@ fuzzy_match_str(char_u *str, char_u *pat)
     if (str == NULL || pat == NULL)
 	return 0;
 
-    fuzzy_match(str, pat, FALSE, &score, matchpos,
+    fuzzy_match(str, pat, TRUE, &score, matchpos,
 				sizeof(matchpos) / sizeof(matchpos[0]));
 
     return score;

src/testdir/dumps/Test_wildmenu_pum_41.dump

@@ -0,0 +1,10 @@
+| +0&#ffffff0@74
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000001#e0e0e08|a|b@1|r|e|v|i|a|t|e| @4| +0#4040ff13#ffffff0@58
+| +0#0000001#ffd7ff255|a|b|c|l|e|a|r| @7| +0#4040ff13#ffffff0@58
+| +0#0000001#ffd7ff255|a|b|o|v|e|l|e|f|t| @5| +0#4040ff13#ffffff0@58
+| +0#0000001#ffd7ff255|a|b|s|t|r|a|c|t| @6| +0#4040ff13#ffffff0@58
+|:+0#0000000&|a|b@1|r|e|v|i|a|t|e> @63

src/testdir/test_cmdline.vim

@@ -2181,6 +2181,11 @@ func Test_wildmenu_pum()
       set tabline=%!MyTabLine()
       set showtabline=2
     endfunc
+
+    func DoFeedKeys()
+      let &wildcharm = char2nr("\t")
+      call feedkeys(":edit $VIMRUNTIME/\<Tab>\<Left>\<C-U>ab\<Tab>")
+    endfunc
   [CODE]
   call writefile(commands, 'Xtest')
 
@@ -2378,6 +2383,12 @@ func Test_wildmenu_pum()
   call term_sendkeys(buf, "\<Esc>")
   call VerifyScreenDump(buf, 'Test_wildmenu_pum_40', {})
 
+  " popup is cleared also when 'lazyredraw' is set
+  call term_sendkeys(buf, ":set showtabline=1 laststatus=1 lazyredraw\<CR>")
+  call term_sendkeys(buf, ":call DoFeedKeys()\<CR>")
+  call VerifyScreenDump(buf, 'Test_wildmenu_pum_41', {})
+  call term_sendkeys(buf, "\<Esc>")
+
   call term_sendkeys(buf, "\<C-U>\<CR>")
   call StopVimInTerminal(buf)
   call delete('Xtest')
@@ -2444,9 +2455,8 @@ func Test_cmdline_complete_dlist()
   call assert_equal("\"dlist 10 /pat/ | chistory", @:)
 endfunc
 
-" Test for 'fuzzy' in 'wildoptions' (fuzzy completion)
-func Test_wildoptions_fuzzy()
-  " argument list (only for :argdel)
+" argument list (only for :argdel) fuzzy completion
+func Test_fuzzy_completion_arglist()
   argadd change.py count.py charge.py
   set wildoptions&
   call feedkeys(":argdel cge\<C-A>\<C-B>\"\<CR>", 'tx')
@@ -2455,8 +2465,11 @@ func Test_wildoptions_fuzzy()
   call feedkeys(":argdel cge\<C-A>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"argdel change.py charge.py', @:)
   %argdelete
+  set wildoptions&
+endfunc
 
-  " autocmd group name fuzzy completion
+" autocmd group name fuzzy completion
+func Test_fuzzy_completion_autocmd()
   set wildoptions&
   augroup MyFuzzyGroup
   augroup END
@@ -2470,8 +2483,11 @@ func Test_wildoptions_fuzzy()
   call feedkeys(":augroup My*p\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"augroup My*p', @:)
   augroup! MyFuzzyGroup
+  set wildoptions&
+endfunc
 
-  " buffer name fuzzy completion
+" buffer name fuzzy completion
+func Test_fuzzy_completion_bufname()
   set wildoptions&
   edit SomeFile.txt
   enew
@@ -2485,24 +2501,29 @@ func Test_wildoptions_fuzzy()
   call feedkeys(":b S*File.txt\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"b S*File.txt', @:)
   %bw!
+  set wildoptions&
+endfunc
 
-  " buffer name (full path) fuzzy completion
-  if has('unix')
-    set wildoptions&
-    call mkdir('Xcmd/Xstate/Xfile.js', 'p')
-    edit Xcmd/Xstate/Xfile.js
-    cd Xcmd/Xstate
-    enew
-    call feedkeys(":b CmdStateFile\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"b CmdStateFile', @:)
-    set wildoptions=fuzzy
-    call feedkeys(":b CmdStateFile\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_match('Xcmd/Xstate/Xfile.js$', @:)
-    cd -
-    call delete('Xcmd', 'rf')
-  endif
+" buffer name (full path) fuzzy completion
+func Test_fuzzy_completion_bufname_fullpath()
+  CheckUnix
+  set wildoptions&
+  call mkdir('Xcmd/Xstate/Xfile.js', 'p')
+  edit Xcmd/Xstate/Xfile.js
+  cd Xcmd/Xstate
+  enew
+  call feedkeys(":b CmdStateFile\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"b CmdStateFile', @:)
+  set wildoptions=fuzzy
+  call feedkeys(":b CmdStateFile\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_match('Xcmd/Xstate/Xfile.js$', @:)
+  cd -
+  call delete('Xcmd', 'rf')
+  set wildoptions&
+endfunc
 
-  " :behave suboptions fuzzy completion
+" :behave suboptions fuzzy completion
+func Test_fuzzy_completion_behave()
   set wildoptions&
   call feedkeys(":behave xm\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"behave xm', @:)
@@ -2517,10 +2538,15 @@ func Test_wildoptions_fuzzy()
   call feedkeys(":behave win\<C-D>\<F4>\<C-B>\"\<CR>", 'tx')
   call assert_equal('mswin', g:Sline)
   call assert_equal('"behave win', @:)
+  set wildoptions&
+endfunc
 
-  " colorscheme name fuzzy completion - NOT supported
+" " colorscheme name fuzzy completion - NOT supported
+" func Test_fuzzy_completion_colorscheme()
+" endfunc
 
-  " built-in command name fuzzy completion
+" built-in command name fuzzy completion
+func Test_fuzzy_completion_cmdname()
   set wildoptions&
   call feedkeys(":sbwin\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"sbwin', @:)
@@ -2531,24 +2557,31 @@ func Test_wildoptions_fuzzy()
   call assert_equal('"sbrewind', @:)
   call feedkeys(":sbr*d\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"sbr*d', @:)
+  set wildoptions&
+endfunc
 
-  " compiler name fuzzy completion - NOT supported
+" " compiler name fuzzy completion - NOT supported
+" func Test_fuzzy_completion_compiler()
+" endfunc
 
-  " :cscope suboptions fuzzy completion
-  if has('cscope')
-    set wildoptions&
-    call feedkeys(":cscope ret\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"cscope ret', @:)
-    call feedkeys(":cscope re*t\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"cscope reset', @:)
-    set wildoptions=fuzzy
-    call feedkeys(":cscope ret\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"cscope reset', @:)
-    call feedkeys(":cscope re*t\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"cscope re*t', @:)
-  endif
+" :cscope suboptions fuzzy completion
+func Test_fuzzy_completion_cscope()
+  CheckFeature cscope
+  set wildoptions&
+  call feedkeys(":cscope ret\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"cscope ret', @:)
+  call feedkeys(":cscope re*t\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"cscope reset', @:)
+  set wildoptions=fuzzy
+  call feedkeys(":cscope ret\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"cscope reset', @:)
+  call feedkeys(":cscope re*t\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"cscope re*t', @:)
+  set wildoptions&
+endfunc
 
-  " :diffget/:diffput buffer name fuzzy completion
+" :diffget/:diffput buffer name fuzzy completion
+func Test_fuzzy_completion_diff()
   new SomeBuffer
   diffthis
   new OtherBuffer
@@ -2564,26 +2597,37 @@ func Test_wildoptions_fuzzy()
   call feedkeys(":diffput sbuf\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"diffput SomeBuffer', @:)
   %bw!
+  set wildoptions&
+endfunc
 
-  " directory name fuzzy completion - NOT supported
+" " directory name fuzzy completion - NOT supported
+" func Test_fuzzy_completion_dirname()
+" endfunc
 
-  " environment variable name fuzzy completion
+" environment variable name fuzzy completion
+func Test_fuzzy_completion_env()
   set wildoptions&
   call feedkeys(":echo $VUT\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"echo $VUT', @:)
   set wildoptions=fuzzy
   call feedkeys(":echo $VUT\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"echo $VIMRUNTIME', @:)
+  set wildoptions&
+endfunc
 
-  " autocmd event fuzzy completion
+" autocmd event fuzzy completion
+func Test_fuzzy_completion_autocmd_event()
   set wildoptions&
   call feedkeys(":autocmd BWout\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"autocmd BWout', @:)
   set wildoptions=fuzzy
   call feedkeys(":autocmd BWout\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"autocmd BufWipeout', @:)
+  set wildoptions&
+endfunc
 
-  " vim expression fuzzy completion
+" vim expression fuzzy completion
+func Test_fuzzy_completion_expr()
   let g:PerPlaceCount = 10
   set wildoptions&
   call feedkeys(":let c = ppc\<Tab>\<C-B>\"\<CR>", 'tx')
@@ -2591,32 +2635,67 @@ func Test_wildoptions_fuzzy()
   set wildoptions=fuzzy
   call feedkeys(":let c = ppc\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"let c = PerPlaceCount', @:)
-
-  " file name fuzzy completion - NOT supported
-
-  " files in path fuzzy completion - NOT supported
-
-  " filetype name fuzzy completion - NOT supported
-
-  " user defined function name completion
   set wildoptions&
-  call feedkeys(":call Test_w_fuz\<Tab>\<C-B>\"\<CR>", 'tx')
-  call assert_equal('"call Test_w_fuz', @:)
-  set wildoptions=fuzzy
-  call feedkeys(":call Test_w_fuz\<Tab>\<C-B>\"\<CR>", 'tx')
-  call assert_equal('"call Test_wildoptions_fuzzy()', @:)
+endfunc
 
-  " user defined command name completion
+" " file name fuzzy completion - NOT supported
+" func Test_fuzzy_completion_filename()
+" endfunc
+
+" " files in path fuzzy completion - NOT supported
+" func Test_fuzzy_completion_filesinpath()
+" endfunc
+
+" " filetype name fuzzy completion - NOT supported
+" func Test_fuzzy_completion_filetype()
+" endfunc
+
+" user defined function name completion
+func Test_fuzzy_completion_userdefined_func()
+  set wildoptions&
+  call feedkeys(":call Test_f_u_f\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"call Test_f_u_f', @:)
+  set wildoptions=fuzzy
+  call feedkeys(":call Test_f_u_f\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"call Test_fuzzy_completion_userdefined_func()', @:)
+  set wildoptions&
+endfunc
+
+" <SNR> functions should be sorted to the end
+func Test_fuzzy_completion_userdefined_snr_func()
+  func s:Sendmail()
+  endfunc
+  func SendSomemail()
+  endfunc
+  func S1e2n3dmail()
+  endfunc
+  set wildoptions=fuzzy
+  call feedkeys(":call sendmail\<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"call SendSomemail() S1e2n3dmail() '
+        \ .. expand("<SID>") .. 'Sendmail()', @:)
+  set wildoptions&
+  delfunc s:Sendmail
+  delfunc SendSomemail
+  delfunc S1e2n3dmail
+endfunc
+
+" user defined command name completion
+func Test_fuzzy_completion_userdefined_cmd()
   set wildoptions&
   call feedkeys(":MsFeat\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"MsFeat', @:)
   set wildoptions=fuzzy
   call feedkeys(":MsFeat\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"MissingFeature', @:)
+  set wildoptions&
+endfunc
 
-  " :help tag fuzzy completion - NOT supported
+" " :help tag fuzzy completion - NOT supported
+" func Test_fuzzy_completion_helptag()
+" endfunc
 
-  " highlight group name fuzzy completion
+" highlight group name fuzzy completion
+func Test_fuzzy_completion_hlgroup()
   set wildoptions&
   call feedkeys(":highlight SKey\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"highlight SKey', @:)
@@ -2627,8 +2706,11 @@ func Test_wildoptions_fuzzy()
   call assert_equal('"highlight SpecialKey', @:)
   call feedkeys(":highlight Sp*Key\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"highlight Sp*Key', @:)
+  set wildoptions&
+endfunc
 
-  " :history suboptions fuzzy completion
+" :history suboptions fuzzy completion
+func Test_fuzzy_completion_history()
   set wildoptions&
   call feedkeys(":history dg\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"history dg', @:)
@@ -2639,46 +2721,110 @@ func Test_wildoptions_fuzzy()
   call assert_equal('"history debug', @:)
   call feedkeys(":history se*h\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"history se*h', @:)
+  set wildoptions&
+endfunc
 
-  " :language locale name fuzzy completion
-  if has('unix')
-    set wildoptions&
-    call feedkeys(":lang psx\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"lang psx', @:)
-    set wildoptions=fuzzy
-    call feedkeys(":lang psx\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"lang POSIX', @:)
-  endif
+" :language locale name fuzzy completion
+func Test_fuzzy_completion_lang()
+  CheckUnix
+  set wildoptions&
+  call feedkeys(":lang psx\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"lang psx', @:)
+  set wildoptions=fuzzy
+  call feedkeys(":lang psx\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"lang POSIX', @:)
+  set wildoptions&
+endfunc
 
-  " :mapclear buffer argument fuzzy completion
+" :mapclear buffer argument fuzzy completion
+func Test_fuzzy_completion_mapclear()
   set wildoptions&
   call feedkeys(":mapclear buf\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"mapclear buf', @:)
   set wildoptions=fuzzy
   call feedkeys(":mapclear buf\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"mapclear <buffer>', @:)
+  set wildoptions&
+endfunc
 
-  " map name fuzzy completion - NOT supported
+" map name fuzzy completion
+func Test_fuzzy_completion_mapname()
+  " test regex completion works
+  set wildoptions=fuzzy
+  call feedkeys(":cnoremap <ex\<Tab> <esc> \<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"cnoremap <expr> <esc> \<Tab>", @:)
+  nmap <plug>MyLongMap :p<CR>
+  call feedkeys(":nmap MLM\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"nmap <Plug>MyLongMap", @:)
+  call feedkeys(":nmap MLM \<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"nmap MLM \t", @:)
+  call feedkeys(":nmap <F2> one two \<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"nmap <F2> one two \t", @:)
+  " duplicate entries should be removed
+  vmap <plug>MyLongMap :<C-U>#<CR>
+  call feedkeys(":nmap MLM\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"nmap <Plug>MyLongMap", @:)
+  nunmap <plug>MyLongMap
+  vunmap <plug>MyLongMap
+  call feedkeys(":nmap ABC\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"nmap ABC\t", @:)
+  " results should be sorted by best match
+  nmap <Plug>format :
+  nmap <Plug>goformat :
+  nmap <Plug>TestFOrmat :
+  nmap <Plug>fendoff :
+  nmap <Plug>state :
+  nmap <Plug>FendingOff :
+  call feedkeys(":nmap <Plug>fo\<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"nmap <Plug>format <Plug>TestFOrmat <Plug>FendingOff <Plug>goformat <Plug>fendoff", @:)
+  nunmap <Plug>format
+  nunmap <Plug>goformat
+  nunmap <Plug>TestFOrmat
+  nunmap <Plug>fendoff
+  nunmap <Plug>state
+  nunmap <Plug>FendingOff
+  set wildoptions&
+endfunc
 
-  " menu name fuzzy completion
-  if has('gui_running')
-    set wildoptions&
-    call feedkeys(":menu pup\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"menu pup', @:)
-    set wildoptions=fuzzy
-    call feedkeys(":menu pup\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"menu PopUp.', @:)
-  endif
+" abbreviation fuzzy completion
+func Test_fuzzy_completion_abbr()
+  set wildoptions=fuzzy
+  call feedkeys(":iabbr wait\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"iabbr <nowait>", @:)
+  iabbr WaitForCompletion WFC
+  call feedkeys(":iabbr fcl\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"iabbr WaitForCompletion", @:)
+  call feedkeys(":iabbr a1z\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"iabbr a1z\t", @:)
+  iunabbrev WaitForCompletion
+  set wildoptions&
+endfunc
 
-  " :messages suboptions fuzzy completion
+" menu name fuzzy completion
+func Test_fuzzy_completion_menu()
+  CheckGui
+  set wildoptions&
+  call feedkeys(":menu pup\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"menu pup', @:)
+  set wildoptions=fuzzy
+  call feedkeys(":menu pup\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"menu PopUp.', @:)
+  set wildoptions&
+endfunc
+
+" :messages suboptions fuzzy completion
+func Test_fuzzy_completion_messages()
   set wildoptions&
   call feedkeys(":messages clr\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"messages clr', @:)
   set wildoptions=fuzzy
   call feedkeys(":messages clr\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"messages clear', @:)
+  set wildoptions&
+endfunc
 
-  " :set option name fuzzy completion
+" :set option name fuzzy completion
+func Test_fuzzy_completion_option()
   set wildoptions&
   call feedkeys(":set brkopt\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"set brkopt', @:)
@@ -2691,8 +2837,11 @@ func Test_wildoptions_fuzzy()
   set wildoptions=fuzzy
   call feedkeys(":set fixeol\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"set fixendofline', @:)
+  set wildoptions&
+endfunc
 
-  " :set <term_option>
+" :set <term_option>
+func Test_fuzzy_completion_term_option()
   set wildoptions&
   call feedkeys(":set t_E\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"set t_EC', @:)
@@ -2703,52 +2852,76 @@ func Test_wildoptions_fuzzy()
   call assert_equal('"set t_EC', @:)
   call feedkeys(":set <t_E\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"set <t_EC>', @:)
+  set wildoptions&
+endfunc
 
-  " :packadd directory name fuzzy completion - NOT supported
+" " :packadd directory name fuzzy completion - NOT supported
+" func Test_fuzzy_completion_packadd()
+" endfunc
 
-  " shell command name fuzzy completion - NOT supported
+" " shell command name fuzzy completion - NOT supported
+" func Test_fuzzy_completion_shellcmd()
+" endfunc
 
-  " :sign suboptions fuzzy completion
+" :sign suboptions fuzzy completion
+func Test_fuzzy_completion_sign()
   set wildoptions&
   call feedkeys(":sign ufe\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"sign ufe', @:)
   set wildoptions=fuzzy
   call feedkeys(":sign ufe\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"sign undefine', @:)
+  set wildoptions&
+endfunc
 
-  " :syntax suboptions fuzzy completion
+" :syntax suboptions fuzzy completion
+func Test_fuzzy_completion_syntax_cmd()
   set wildoptions&
   call feedkeys(":syntax kwd\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"syntax kwd', @:)
   set wildoptions=fuzzy
   call feedkeys(":syntax kwd\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"syntax keyword', @:)
+  set wildoptions&
+endfunc
 
-  " syntax group name fuzzy completion
+" syntax group name fuzzy completion
+func Test_fuzzy_completion_syntax_group()
   set wildoptions&
   call feedkeys(":syntax list mpar\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"syntax list mpar', @:)
   set wildoptions=fuzzy
   call feedkeys(":syntax list mpar\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"syntax list MatchParen', @:)
+  set wildoptions&
+endfunc
 
-  " :syntime suboptions fuzzy completion
-  if has('profile')
-    set wildoptions&
-    call feedkeys(":syntime clr\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"syntime clr', @:)
-    set wildoptions=fuzzy
-    call feedkeys(":syntime clr\<Tab>\<C-B>\"\<CR>", 'tx')
-    call assert_equal('"syntime clear', @:)
-  endif
+" :syntime suboptions fuzzy completion
+func Test_fuzzy_completion_syntime()
+  CheckFeature profile
+  set wildoptions&
+  call feedkeys(":syntime clr\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"syntime clr', @:)
+  set wildoptions=fuzzy
+  call feedkeys(":syntime clr\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"syntime clear', @:)
+  set wildoptions&
+endfunc
 
-  " tag name fuzzy completion - NOT supported
+" " tag name fuzzy completion - NOT supported
+" func Test_fuzzy_completion_tagname()
+" endfunc
 
-  " tag name and file fuzzy completion - NOT supported
+" " tag name and file fuzzy completion - NOT supported
+" func Test_fuzzy_completion_tagfile()
+" endfunc
 
-  " user names fuzzy completion - how to test this functionality?
+" " user names fuzzy completion - how to test this functionality?
+" func Test_fuzzy_completion_username()
+" endfunc
 
-  " user defined variable name fuzzy completion
+" user defined variable name fuzzy completion
+func Test_fuzzy_completion_userdefined_var()
   let g:SomeVariable=10
   set wildoptions&
   call feedkeys(":let SVar\<Tab>\<C-B>\"\<CR>", 'tx')
@@ -2756,8 +2929,11 @@ func Test_wildoptions_fuzzy()
   set wildoptions=fuzzy
   call feedkeys(":let SVar\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"let SomeVariable', @:)
+  set wildoptions&
+endfunc
 
-  " Test for sorting the results by the best match
+" Test for sorting the results by the best match
+func Test_fuzzy_completion_cmd_sort_results()
   %bw!
   command T123format :
   command T123goformat :
@@ -2775,9 +2951,11 @@ func Test_wildoptions_fuzzy()
   delcommand T123state
   delcommand T123FendingOff
   %bw
+  set wildoptions&
+endfunc
 
-  " Test for fuzzy completion of a command with lower case letters and a
-  " number
+" Test for fuzzy completion of a command with lower case letters and a number
+func Test_fuzzy_completion_cmd_alnum()
   command Foo2Bar :
   set wildoptions=fuzzy
   call feedkeys(":foo2\<Tab>\<C-B>\"\<CR>", 'tx')
@@ -2787,9 +2965,46 @@ func Test_wildoptions_fuzzy()
   call feedkeys(":bar\<Tab>\<C-B>\"\<CR>", 'tx')
   call assert_equal('"Foo2Bar', @:)
   delcommand Foo2Bar
-
   set wildoptions&
-  %bw!
+endfunc
+
+" Test for command completion for a command starting with 'k'
+func Test_fuzzy_completion_cmd_k()
+  command KillKillKill :
+  set wildoptions&
+  call feedkeys(":killkill\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"killkill\<Tab>", @:)
+  set wildoptions=fuzzy
+  call feedkeys(":killkill\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"KillKillKill', @:)
+  delcom KillKillKill
+  set wildoptions&
+endfunc
+
+" Test for fuzzy completion for user defined custom completion function
+func Test_fuzzy_completion_custom_func()
+  func Tcompl(a, c, p)
+    return "format\ngoformat\nTestFOrmat\nfendoff\nstate"
+  endfunc
+  command -nargs=* -complete=custom,Tcompl Fuzzy :
+  set wildoptions&
+  call feedkeys(":Fuzzy fo\<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"Fuzzy format", @:)
+  call feedkeys(":Fuzzy xy\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"Fuzzy xy", @:)
+  call feedkeys(":Fuzzy ttt\<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"Fuzzy ttt", @:)
+  set wildoptions=fuzzy
+  call feedkeys(":Fuzzy \<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"Fuzzy format goformat TestFOrmat fendoff state", @:)
+  call feedkeys(":Fuzzy fo\<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"Fuzzy format TestFOrmat goformat fendoff", @:)
+  call feedkeys(":Fuzzy xy\<Tab>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"Fuzzy xy", @:)
+  call feedkeys(":Fuzzy ttt\<C-A>\<C-B>\"\<CR>", 'tx')
+  call assert_equal("\"Fuzzy TestFOrmat", @:)
+  delcom Fuzzy
+  set wildoptions&
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab

src/testdir/test_vim9_assign.vim

@@ -550,6 +550,13 @@ def Test_assign_index()
   bl[-2] = 0x66
   assert_equal(0z77226644, bl)
 
+  lines =<< trim END
+      g:val = '22'
+      var bl = 0z11
+      bl[1] = g:val
+  END
+  v9.CheckDefExecAndScriptFailure(lines, 'E1030: Using a String as a Number: "22"')
+
   # should not read the next line when generating "a.b"
   var a = {}
   a.b = {}
@@ -1233,12 +1240,18 @@ def Test_script_var_default()
   var lines =<< trim END
       vim9script
       var l: list<number>
+      var li = [1, 2]
       var bl: blob
+      var bli = 0z12
       var d: dict<number>
+      var di = {'a': 1, 'b': 2}
       def Echo()
         assert_equal([], l)
+        assert_equal([1, 2], li)
         assert_equal(0z, bl)
+        assert_equal(0z12, bli)
         assert_equal({}, d)
+        assert_equal({'a': 1, 'b': 2}, di)
       enddef
       Echo()
   END
@@ -1502,6 +1515,30 @@ def Test_assign_list()
   END
   v9.CheckDefAndScriptSuccess(lines)
 
+  lines =<< trim END
+      var l = [1, 2]
+      g:idx = 'x'
+      l[g:idx : 1] = [0]
+      echo l
+  END
+  v9.CheckDefExecAndScriptFailure(lines, 'E1030: Using a String as a Number: "x"')
+
+  lines =<< trim END
+      var l = [1, 2]
+      g:idx = 3
+      l[g:idx : 1] = [0]
+      echo l
+  END
+  v9.CheckDefExecAndScriptFailure(lines, 'E684: list index out of range: 3')
+
+  lines =<< trim END
+      var l = [1, 2]
+      g:idx = 'y'
+      l[1 : g:idx] = [0]
+      echo l
+  END
+  v9.CheckDefExecAndScriptFailure(lines, ['E1012: Type mismatch; expected number but got string', 'E1030: Using a String as a Number: "y"'])
+
   v9.CheckDefFailure(["var l: list<number> = ['', true]"], 'E1012: Type mismatch; expected list<number> but got list<any>', 1)
   v9.CheckDefFailure(["var l: list<list<number>> = [['', true]]"], 'E1012: Type mismatch; expected list<list<number>> but got list<list<any>>', 1)
 enddef

src/testdir/test_vim9_disassemble.vim

@@ -1846,6 +1846,8 @@ def Test_disassemble_compare()
         ['true != isFalse', 'COMPAREBOOL !='],
         ['v:none == isNull', 'COMPARESPECIAL =='],
         ['v:none != isNull', 'COMPARESPECIAL !='],
+        ['"text" == isNull', 'COMPARENULL =='],
+        ['"text" != isNull', 'COMPARENULL !='],
 
         ['111 == aNumber', 'COMPARENR =='],
         ['111 != aNumber', 'COMPARENR !='],

src/testdir/test_vim9_expr.vim

@@ -712,6 +712,81 @@ def Test_expr4_equal()
   unlet g:notReached
 enddef
 
+def Test_expr4_compare_null()
+  g:null_dict = test_null_dict()
+  g:not_null_list = []
+  var lines =<< trim END
+      assert_true(test_null_blob() == v:null)
+      assert_true(v:null == test_null_blob())
+      assert_false(test_null_blob() != v:null)
+      assert_false(v:null != test_null_blob())
+
+      if has('channel')
+        assert_true(test_null_channel() == v:null)
+        assert_true(v:null == test_null_channel())
+        assert_false(test_null_channel() != v:null)
+        assert_false(v:null != test_null_channel())
+      endif
+
+      assert_true(test_null_dict() == v:null)
+      assert_true(v:null == test_null_dict())
+      assert_false(test_null_dict() != v:null)
+      assert_false(v:null != test_null_dict())
+
+      assert_true(g:null_dict == v:null)
+      assert_true(v:null == g:null_dict)
+      assert_false(g:null_dict != v:null)
+      assert_false(v:null != g:null_dict)
+
+      assert_true(test_null_function() == v:null)
+      assert_true(v:null == test_null_function())
+      assert_false(test_null_function() != v:null)
+      assert_false(v:null != test_null_function())
+
+      if has('job')
+        assert_true(test_null_job() == v:null)
+        assert_true(v:null == test_null_job())
+        assert_false(test_null_job() != v:null)
+        assert_false(v:null != test_null_job())
+      endif
+
+      assert_true(test_null_list() == v:null)
+      assert_true(v:null == test_null_list())
+      assert_false(test_null_list() != v:null)
+      assert_false(v:null != test_null_list())
+
+      assert_false(g:not_null_list == v:null)
+      assert_false(v:null == g:not_null_list)
+      assert_true(g:not_null_list != v:null)
+      assert_true(v:null != g:not_null_list)
+
+      assert_true(test_null_partial() == v:null)
+      assert_true(v:null == test_null_partial())
+      assert_false(test_null_partial() != v:null)
+      assert_false(v:null != test_null_partial())
+
+      assert_true(test_null_string() == v:null)
+      assert_true(v:null == test_null_string())
+      assert_false(test_null_string() != v:null)
+      assert_false(v:null != test_null_string())
+  END
+  v9.CheckDefAndScriptSuccess(lines)
+  unlet g:null_dict
+  unlet g:not_null_list
+
+  v9.CheckDefAndScriptFailure(['echo 123 == v:null'], 'E1072: Cannot compare number with special')
+  v9.CheckDefAndScriptFailure(['echo v:null == 123'], 'E1072: Cannot compare special with number')
+  v9.CheckDefAndScriptFailure(['echo 123 != v:null'], 'E1072: Cannot compare number with special')
+  v9.CheckDefAndScriptFailure(['echo v:null != 123'], 'E1072: Cannot compare special with number')
+  v9.CheckDefAndScriptFailure(['echo true == v:null'], 'E1072: Cannot compare bool with special')
+  v9.CheckDefAndScriptFailure(['echo v:null == true'], 'E1072: Cannot compare special with bool')
+  v9.CheckDefAndScriptFailure(['echo true != v:null'], 'E1072: Cannot compare bool with special')
+  v9.CheckDefAndScriptFailure(['echo v:null != true'], 'E1072: Cannot compare special with bool')
+  v9.CheckDefAndScriptFailure(['echo false == v:null'], 'E1072: Cannot compare bool with special')
+
+  v9.CheckDefExecAndScriptFailure(['echo [] == v:none'], ['E1072: Cannot compare list with special', 'E691: Can only compare List with List'])
+enddef
+
 def Test_expr4_wrong_type()
   for op in ['>', '>=', '<', '<=', '=~', '!~']
     v9.CheckDefExecAndScriptFailure([
@@ -2782,6 +2857,23 @@ def Test_expr8_any_index_slice()
 
   v9.CheckDefAndScriptSuccess(lines)
 
+  lines =<< trim END
+      vim9script
+
+      def PosIdx(s: string): string
+        return s[1]
+      enddef
+      def NegIdx(s: string): string
+        return s[-1]
+      enddef
+
+      set enc=latin1
+      assert_equal("\xe4", PosIdx("a\xe4\xe5"))
+      assert_equal("\xe5", NegIdx("a\xe4\xe5"))
+      set enc=utf-8
+  END
+  v9.CheckScriptSuccess(lines)
+
   v9.CheckDefExecAndScriptFailure(['echo g:testblob[2]'], 'E979:', 1)
   v9.CheckDefExecAndScriptFailure(['echo g:testblob[-3]'], 'E979:', 1)
 

src/testdir/test_vim9_func.vim

@@ -550,6 +550,44 @@ def Test_call_ufunc_count()
   unlet g:counter
 enddef
 
+def Test_call_ufunc_failure()
+  var lines =<< trim END
+      vim9script
+      def Tryit()
+        g:Global(1, 2, 3)
+      enddef
+
+      func g:Global(a, b, c)
+        echo a:a a:b a:c
+      endfunc
+
+      defcompile
+
+      func! g:Global(a, b)
+        echo a:a a:b 
+      endfunc
+      Tryit()
+  END
+  v9.CheckScriptFailure(lines, 'E118: Too many arguments for function: Global')
+  delfunc g:Global
+
+  lines =<< trim END
+      vim9script
+
+      g:Ref = function('len')
+      def Tryit()
+        g:Ref('x')
+      enddef
+
+      defcompile
+
+      g:Ref = function('add')
+      Tryit()
+  END
+  v9.CheckScriptFailure(lines, 'E119: Not enough arguments for function: add')
+  unlet g:Ref
+enddef
+
 def s:MyVarargs(arg: string, ...rest: list<string>): string
   var res = arg
   for s in rest

src/testdir/test_vimscript.vim

@@ -6546,9 +6546,16 @@ func Test_type()
     call assert_true(v:true != v:false)
 
     call assert_true(v:null == 0)
+    call assert_false(v:null == 1)
     call assert_false(v:null != 0)
     call assert_true(v:none == 0)
+    call assert_false(v:none == 1)
     call assert_false(v:none != 0)
+    if has('float')
+      call assert_true(v:null == 0.0)
+      call assert_false(v:null == 0.1)
+      call assert_false(v:null != 0.0)
+    endif
 
     call assert_true(v:false is v:false)
     call assert_true(v:true is v:true)

src/typval.c

@@ -1169,6 +1169,21 @@ typval_compare(
 	// it means TRUE.
 	n1 = (type == EXPR_ISNOT);
     }
+    else if (((tv1->v_type == VAR_SPECIAL && tv1->vval.v_number == VVAL_NULL)
+		|| (tv2->v_type == VAR_SPECIAL
+					   && tv2->vval.v_number == VVAL_NULL))
+	    && tv1->v_type != tv2->v_type
+	    && (type == EXPR_EQUAL || type == EXPR_NEQUAL))
+    {
+	n1 = typval_compare_null(tv1, tv2);
+	if (n1 == MAYBE)
+	{
+	    clear_tv(tv1);
+	    return FAIL;
+	}
+	if (type == EXPR_NEQUAL)
+	    n1 = !n1;
+    }
     else if (tv1->v_type == VAR_BLOB || tv2->v_type == VAR_BLOB)
     {
 	if (typval_compare_blob(tv1, tv2, type, &res) == FAIL)
@@ -1365,6 +1380,48 @@ typval_compare_list(
     return OK;
 }
 
+/*
+ * Compare v:null/v:none with another type.  Return TRUE if the value is NULL.
+ */
+    int
+typval_compare_null(typval_T *tv1, typval_T *tv2)
+{
+    if ((tv1->v_type == VAR_SPECIAL && tv1->vval.v_number == VVAL_NULL)
+	    || (tv2->v_type == VAR_SPECIAL && tv2->vval.v_number == VVAL_NULL))
+    {
+	typval_T	*tv = tv1->v_type == VAR_SPECIAL ? tv2 : tv1;
+
+	switch (tv->v_type)
+	{
+	    case VAR_BLOB: return tv->vval.v_blob == NULL;
+#ifdef FEAT_JOB_CHANNEL
+	    case VAR_CHANNEL: return tv->vval.v_channel == NULL;
+#endif
+	    case VAR_DICT: return tv->vval.v_dict == NULL;
+	    case VAR_FUNC: return tv->vval.v_string == NULL;
+#ifdef FEAT_JOB_CHANNEL
+	    case VAR_JOB: return tv->vval.v_job == NULL;
+#endif
+	    case VAR_LIST: return tv->vval.v_list == NULL;
+	    case VAR_PARTIAL: return tv->vval.v_partial == NULL;
+	    case VAR_STRING: return tv->vval.v_string == NULL;
+
+	    case VAR_NUMBER: if (!in_vim9script())
+				 return tv->vval.v_number == 0;
+			     break;
+#ifdef FEAT_FLOAT
+	    case VAR_FLOAT: if (!in_vim9script())
+				 return tv->vval.v_float == 0.0;
+			     break;
+#endif
+	    default: break;
+	}
+    }
+    semsg(_(e_cannot_compare_str_with_str),
+			 vartype_name(tv1->v_type), vartype_name(tv2->v_type));
+    return MAYBE;
+}
+
 /*
  * Compare "tv1" to "tv2" as blobs acording to "type".
  * Put the result, false or true, in "res".

src/version.c

@@ -754,6 +754,32 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4489,
+/**/
+    4488,
+/**/
+    4487,
+/**/
+    4486,
+/**/
+    4485,
+/**/
+    4484,
+/**/
+    4483,
+/**/
+    4482,
+/**/
+    4481,
+/**/
+    4480,
+/**/
+    4479,
+/**/
+    4478,
+/**/
+    4477,
 /**/
     4476,
 /**/

src/vim9.h

@@ -134,6 +134,7 @@ typedef enum {
     // comparative operations; isn_arg.op.op_type is exprtype_T, op_ic used
     ISN_COMPAREBOOL,
     ISN_COMPARESPECIAL,
+    ISN_COMPARENULL,
     ISN_COMPARENR,
     ISN_COMPAREFLOAT,
     ISN_COMPARESTRING,

src/vim9execute.c

@@ -1027,7 +1027,7 @@ call_by_name(
     {
 	int func_idx = find_internal_func(name);
 
-	if (func_idx < 0)
+	if (func_idx < 0)  // Impossible?
 	    return FAIL;
 	if (check_internal_func(func_idx, argcount) < 0)
 	    return FAIL;
@@ -1452,8 +1452,6 @@ get_split_sourceline(
     char_u		*p;
     char_u		*line;
 
-    if (*sp->nextline == NUL)
-	return NULL;
     p = vim_strchr(sp->nextline, '\n');
     if (p == NULL)
     {
@@ -1911,11 +1909,11 @@ execute_storerange(isn_T *iptr, ectx_T *ectx)
 	    else
 		n2 = (long)tv_get_number_chk(tv_idx2, &error);
 	    if (error)
-		status = FAIL;
+		status = FAIL; // cannot happen?
 	    else
 	    {
 		listitem_T *li1 = check_range_index_one(
-			tv_dest->vval.v_list, &n1, FALSE);
+					     tv_dest->vval.v_list, &n1, FALSE);
 
 		if (li1 == NULL)
 		    status = FAIL;
@@ -3882,6 +3880,25 @@ exec_instructions(ectx_T *ectx)
 		}
 		break;
 
+	    case ISN_COMPARENULL:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    int		res;
+
+		    res = typval_compare_null(tv1, tv2);
+		    if (res == MAYBE)
+			goto on_error;
+		    if (iptr->isn_arg.op.op_type == EXPR_NEQUAL)
+			res = !res;
+		    clear_tv(tv1);
+		    clear_tv(tv2);
+		    --ectx->ec_stack.ga_len;
+		    tv1->v_type = VAR_BOOL;
+		    tv1->vval.v_number = res ? VVAL_TRUE : VVAL_FALSE;
+		}
+		break;
+
 	    // Operation with two number arguments
 	    case ISN_OPNR:
 	    case ISN_COMPARENR:
@@ -5903,6 +5920,7 @@ list_instructions(char *pfx, isn_T *instr, int instr_count, ufunc_T *ufunc)
 
 	    case ISN_COMPAREBOOL:
 	    case ISN_COMPARESPECIAL:
+	    case ISN_COMPARENULL:
 	    case ISN_COMPARENR:
 	    case ISN_COMPAREFLOAT:
 	    case ISN_COMPARESTRING:
@@ -5938,6 +5956,7 @@ list_instructions(char *pfx, isn_T *instr, int instr_count, ufunc_T *ufunc)
 			   case ISN_COMPAREBOOL: type = "COMPAREBOOL"; break;
 			   case ISN_COMPARESPECIAL:
 						 type = "COMPARESPECIAL"; break;
+			   case ISN_COMPARENULL: type = "COMPARENULL"; break;
 			   case ISN_COMPARENR: type = "COMPARENR"; break;
 			   case ISN_COMPAREFLOAT: type = "COMPAREFLOAT"; break;
 			   case ISN_COMPARESTRING:

src/vim9instr.c

@@ -372,6 +372,24 @@ get_compare_isn(exprtype_T exprtype, vartype_T type1, vartype_T type2)
 	    || ((type1 == VAR_NUMBER || type1 == VAR_FLOAT)
 	      && (type2 == VAR_NUMBER || type2 == VAR_FLOAT)))
 	isntype = ISN_COMPAREANY;
+    else if (type1 == VAR_SPECIAL || type2 == VAR_SPECIAL)
+    {
+	switch (type1 == VAR_SPECIAL ? type2 : type1)
+	{
+	    case VAR_BLOB: break;
+	    case VAR_CHANNEL: break;
+	    case VAR_DICT: break;
+	    case VAR_FUNC: break;
+	    case VAR_JOB: break;
+	    case VAR_LIST: break;
+	    case VAR_PARTIAL: break;
+	    case VAR_STRING: break;
+	    default: semsg(_(e_cannot_compare_str_with_str),
+				   vartype_name(type1), vartype_name(type2));
+		     return ISN_DROP;
+	}
+	isntype = ISN_COMPARENULL;
+    }
 
     if ((exprtype == EXPR_IS || exprtype == EXPR_ISNOT)
 	    && (isntype == ISN_COMPAREBOOL
@@ -388,7 +406,7 @@ get_compare_isn(exprtype_T exprtype, vartype_T type1, vartype_T type2)
 		    && (type1 == VAR_BOOL || type1 == VAR_SPECIAL
 		       || type2 == VAR_BOOL || type2 == VAR_SPECIAL)))
 	    || ((exprtype != EXPR_EQUAL && exprtype != EXPR_NEQUAL
-				 && exprtype != EXPR_IS && exprtype != EXPR_ISNOT
+			       && exprtype != EXPR_IS && exprtype != EXPR_ISNOT
 		    && (type1 == VAR_BLOB || type2 == VAR_BLOB
 			|| type1 == VAR_LIST || type2 == VAR_LIST))))
     {
@@ -2131,6 +2149,7 @@ delete_instr(isn_T *isn)
 	case ISN_COMPAREFUNC:
 	case ISN_COMPARELIST:
 	case ISN_COMPARENR:
+	case ISN_COMPARENULL:
 	case ISN_COMPARESPECIAL:
 	case ISN_COMPARESTRING:
 	case ISN_CONCAT: