Update runtime files. Add Rust support.

19 files changed, 1737 insertions, 142 deletions

diff --git a/runtime/autoload/rust.vim b/runtime/autoload/rust.vim
new file mode 100644
index 0000000000..34a3b41773
--- /dev/null
+++ b/runtime/autoload/rust.vim
@@ -0,0 +1,415 @@
+" Author: Kevin Ballard
+" Description: Helper functions for Rust commands/mappings
+" Last Modified: May 27, 2014
+" For bugs, patches and license go to https://github.com/rust-lang/rust.vim
+
+" Jump {{{1
+
+function! rust#Jump(mode, function) range
+	let cnt = v:count1
+	normal! m'
+	if a:mode ==# 'v'
+		norm! gv
+	endif
+	let foldenable = &foldenable
+	set nofoldenable
+	while cnt > 0
+		execute "call <SID>Jump_" . a:function . "()"
+		let cnt = cnt - 1
+	endwhile
+	let &foldenable = foldenable
+endfunction
+
+function! s:Jump_Back()
+	call search('{', 'b')
+	keepjumps normal! w99[{
+endfunction
+
+function! s:Jump_Forward()
+	normal! j0
+	call search('{', 'b')
+	keepjumps normal! w99[{%
+	call search('{')
+endfunction
+
+" Run {{{1
+
+function! rust#Run(bang, args)
+	let args = s:ShellTokenize(a:args)
+	if a:bang
+		let idx = index(l:args, '--')
+		if idx != -1
+			let rustc_args = idx == 0 ? [] : l:args[:idx-1]
+			let args = l:args[idx+1:]
+		else
+			let rustc_args = l:args
+			let args = []
+		endif
+	else
+		let rustc_args = []
+	endif
+
+	let b:rust_last_rustc_args = l:rustc_args
+	let b:rust_last_args = l:args
+
+	call s:WithPath(function("s:Run"), rustc_args, args)
+endfunction
+
+function! s:Run(dict, rustc_args, args)
+	let exepath = a:dict.tmpdir.'/'.fnamemodify(a:dict.path, ':t:r')
+	if has('win32')
+		let exepath .= '.exe'
+	endif
+
+	let relpath = get(a:dict, 'tmpdir_relpath', a:dict.path)
+	let rustc_args = [relpath, '-o', exepath] + a:rustc_args
+
+	let rustc = exists("g:rustc_path") ? g:rustc_path : "rustc"
+
+	let pwd = a:dict.istemp ? a:dict.tmpdir : ''
+	let output = s:system(pwd, shellescape(rustc) . " " . join(map(rustc_args, 'shellescape(v:val)')))
+	if output != ''
+		echohl WarningMsg
+		echo output
+		echohl None
+	endif
+	if !v:shell_error
+		exe '!' . shellescape(exepath) . " " . join(map(a:args, 'shellescape(v:val)'))
+	endif
+endfunction
+
+" Expand {{{1
+
+function! rust#Expand(bang, args)
+	let args = s:ShellTokenize(a:args)
+	if a:bang && !empty(l:args)
+		let pretty = remove(l:args, 0)
+	else
+		let pretty = "expanded"
+	endif
+	call s:WithPath(function("s:Expand"), pretty, args)
+endfunction
+
+function! s:Expand(dict, pretty, args)
+	try
+		let rustc = exists("g:rustc_path") ? g:rustc_path : "rustc"
+
+		if a:pretty =~? '^\%(everybody_loops$\|flowgraph=\)'
+			let flag = '--xpretty'
+		else
+			let flag = '--pretty'
+		endif
+		let relpath = get(a:dict, 'tmpdir_relpath', a:dict.path)
+		let args = [relpath, '-Z', 'unstable-options', l:flag, a:pretty] + a:args
+		let pwd = a:dict.istemp ? a:dict.tmpdir : ''
+		let output = s:system(pwd, shellescape(rustc) . " " . join(map(args, 'shellescape(v:val)')))
+		if v:shell_error
+			echohl WarningMsg
+			echo output
+			echohl None
+		else
+			new
+			silent put =output
+			1
+			d
+			setl filetype=rust
+			setl buftype=nofile
+			setl bufhidden=hide
+			setl noswapfile
+			" give the buffer a nice name
+			let suffix = 1
+			let basename = fnamemodify(a:dict.path, ':t:r')
+			while 1
+				let bufname = basename
+				if suffix > 1 | let bufname .= ' ('.suffix.')' | endif
+				let bufname .= '.pretty.rs'
+				if bufexists(bufname)
+					let suffix += 1
+					continue
+				endif
+				exe 'silent noautocmd keepalt file' fnameescape(bufname)
+				break
+			endwhile
+		endif
+	endtry
+endfunction
+
+function! rust#CompleteExpand(lead, line, pos)
+	if a:line[: a:pos-1] =~ '^RustExpand!\s*\S*$'
+		" first argument and it has a !
+		let list = ["normal", "expanded", "typed", "expanded,identified", "flowgraph=", "everybody_loops"]
+		if !empty(a:lead)
+			call filter(list, "v:val[:len(a:lead)-1] == a:lead")
+		endif
+		return list
+	endif
+
+	return glob(escape(a:lead, "*?[") . '*', 0, 1)
+endfunction
+
+" Emit {{{1
+
+function! rust#Emit(type, args)
+	let args = s:ShellTokenize(a:args)
+	call s:WithPath(function("s:Emit"), a:type, args)
+endfunction
+
+function! s:Emit(dict, type, args)
+	try
+		let output_path = a:dict.tmpdir.'/output'
+
+		let rustc = exists("g:rustc_path") ? g:rustc_path : "rustc"
+
+		let relpath = get(a:dict, 'tmpdir_relpath', a:dict.path)
+		let args = [relpath, '--emit', a:type, '-o', output_path] + a:args
+		let pwd = a:dict.istemp ? a:dict.tmpdir : ''
+		let output = s:system(pwd, shellescape(rustc) . " " . join(map(args, 'shellescape(v:val)')))
+		if output != ''
+			echohl WarningMsg
+			echo output
+			echohl None
+		endif
+		if !v:shell_error
+			new
+			exe 'silent keepalt read' fnameescape(output_path)
+			1
+			d
+			if a:type == "llvm-ir"
+				setl filetype=llvm
+				let extension = 'll'
+			elseif a:type == "asm"
+				setl filetype=asm
+				let extension = 's'
+			endif
+			setl buftype=nofile
+			setl bufhidden=hide
+			setl noswapfile
+			if exists('l:extension')
+				" give the buffer a nice name
+				let suffix = 1
+				let basename = fnamemodify(a:dict.path, ':t:r')
+				while 1
+					let bufname = basename
+					if suffix > 1 | let bufname .= ' ('.suffix.')' | endif
+					let bufname .= '.'.extension
+					if bufexists(bufname)
+						let suffix += 1
+						continue
+					endif
+					exe 'silent noautocmd keepalt file' fnameescape(bufname)
+					break
+				endwhile
+			endif
+		endif
+	endtry
+endfunction
+
+" Utility functions {{{1
+
+" Invokes func(dict, ...)
+" Where {dict} is a dictionary with the following keys:
+"   'path' - The path to the file
+"   'tmpdir' - The path to a temporary directory that will be deleted when the
+"              function returns.
+"   'istemp' - 1 if the path is a file inside of {dict.tmpdir} or 0 otherwise.
+" If {istemp} is 1 then an additional key is provided:
+"   'tmpdir_relpath' - The {path} relative to the {tmpdir}.
+"
+" {dict.path} may be a path to a file inside of {dict.tmpdir} or it may be the
+" existing path of the current buffer. If the path is inside of {dict.tmpdir}
+" then it is guaranteed to have a '.rs' extension.
+function! s:WithPath(func, ...)
+	let buf = bufnr('')
+	let saved = {}
+	let dict = {}
+	try
+		let saved.write = &write
+		set write
+		let dict.path = expand('%')
+		let pathisempty = empty(dict.path)
+
+		" Always create a tmpdir in case the wrapped command wants it
+		let dict.tmpdir = tempname()
+		call mkdir(dict.tmpdir)
+
+		if pathisempty || !saved.write
+			let dict.istemp = 1
+			" if we're doing this because of nowrite, preserve the filename
+			if !pathisempty
+				let filename = expand('%:t:r').".rs"
+			else
+				let filename = 'unnamed.rs'
+			endif
+			let dict.tmpdir_relpath = filename
+			let dict.path = dict.tmpdir.'/'.filename
+
+			let saved.mod = &mod
+			set nomod
+
+			silent exe 'keepalt write! ' . fnameescape(dict.path)
+			if pathisempty
+				silent keepalt 0file
+			endif
+		else
+			let dict.istemp = 0
+			update
+		endif
+
+		call call(a:func, [dict] + a:000)
+	finally
+		if bufexists(buf)
+			for [opt, value] in items(saved)
+				silent call setbufvar(buf, '&'.opt, value)
+				unlet value " avoid variable type mismatches
+			endfor
+		endif
+		if has_key(dict, 'tmpdir') | silent call s:RmDir(dict.tmpdir) | endif
+	endtry
+endfunction
+
+function! rust#AppendCmdLine(text)
+	call setcmdpos(getcmdpos())
+	let cmd = getcmdline() . a:text
+	return cmd
+endfunction
+
+" Tokenize the string according to sh parsing rules
+function! s:ShellTokenize(text)
+	" states:
+	" 0: start of word
+	" 1: unquoted
+	" 2: unquoted backslash
+	" 3: double-quote
+	" 4: double-quoted backslash
+	" 5: single-quote
+	let l:state = 0
+	let l:current = ''
+	let l:args = []
+	for c in split(a:text, '\zs')
+		if l:state == 0 || l:state == 1 " unquoted
+			if l:c ==# ' '
+				if l:state == 0 | continue | endif
+				call add(l:args, l:current)
+				let l:current = ''
+				let l:state = 0
+			elseif l:c ==# '\'
+				let l:state = 2
+			elseif l:c ==# '"'
+				let l:state = 3
+			elseif l:c ==# "'"
+				let l:state = 5
+			else
+				let l:current .= l:c
+				let l:state = 1
+			endif
+		elseif l:state == 2 " unquoted backslash
+			if l:c !=# "\n" " can it even be \n?
+				let l:current .= l:c
+			endif
+			let l:state = 1
+		elseif l:state == 3 " double-quote
+			if l:c ==# '\'
+				let l:state = 4
+			elseif l:c ==# '"'
+				let l:state = 1
+			else
+				let l:current .= l:c
+			endif
+		elseif l:state == 4 " double-quoted backslash
+			if stridx('$`"\', l:c) >= 0
+				let l:current .= l:c
+			elseif l:c ==# "\n" " is this even possible?
+				" skip it
+			else
+				let l:current .= '\'.l:c
+			endif
+			let l:state = 3
+		elseif l:state == 5 " single-quoted
+			if l:c == "'"
+				let l:state = 1
+			else
+				let l:current .= l:c
+			endif
+		endif
+	endfor
+	if l:state != 0
+		call add(l:args, l:current)
+	endif
+	return l:args
+endfunction
+
+function! s:RmDir(path)
+	" sanity check; make sure it's not empty, /, or $HOME
+	if empty(a:path)
+		echoerr 'Attempted to delete empty path'
+		return 0
+	elseif a:path == '/' || a:path == $HOME
+		echoerr 'Attempted to delete protected path: ' . a:path
+		return 0
+	endif
+	return system("rm -rf " . shellescape(a:path))
+endfunction
+
+" Executes {cmd} with the cwd set to {pwd}, without changing Vim's cwd.
+" If {pwd} is the empty string then it doesn't change the cwd.
+function! s:system(pwd, cmd)
+	let cmd = a:cmd
+	if !empty(a:pwd)
+		let cmd = 'cd ' . shellescape(a:pwd) . ' && ' . cmd
+	endif
+	return system(cmd)
+endfunction
+
+" Playpen Support {{{1
+" Parts of gist.vim by Yasuhiro Matsumoto <mattn.jp@gmail.com> reused
+" gist.vim available under the BSD license, available at
+" http://github.com/mattn/gist-vim
+function! s:has_webapi()
+    if !exists("*webapi#http#post")
+	try
+	    call webapi#http#post()
+	catch
+	endtry
+    endif
+    return exists("*webapi#http#post")
+endfunction
+
+function! rust#Play(count, line1, line2, ...) abort
+    redraw
+
+    let l:rust_playpen_url = get(g:, 'rust_playpen_url', 'https://play.rust-lang.org/')
+    let l:rust_shortener_url = get(g:, 'rust_shortener_url', 'https://is.gd/')
+
+    if !s:has_webapi()
+	echohl ErrorMsg | echomsg ':RustPlay depends on webapi.vim (https://github.com/mattn/webapi-vim)' | echohl None
+	return
+    endif
+
+    let bufname = bufname('%')
+    if a:count < 1
+	let content = join(getline(a:line1, a:line2), "\n")
+    else
+	let save_regcont = @"
+	let save_regtype = getregtype('"')
+	silent! normal! gvy
+	let content = @"
+	call setreg('"', save_regcont, save_regtype)
+    endif
+
+    let body = l:rust_playpen_url."?code=".webapi#http#encodeURI(content)
+
+    if strlen(body) > 5000
+	echohl ErrorMsg | echomsg 'Buffer too large, max 5000 encoded characters ('.strlen(body).')' | echohl None
+	return
+    endif
+
+    let payload = "format=simple&url=".webapi#http#encodeURI(body)
+    let res = webapi#http#post(l:rust_shortener_url.'create.php', payload, {})
+    let url = res.content
+
+    redraw | echomsg 'Done: '.url
+endfunction
+
+" }}}1
+
+" vim: set noet sw=8 ts=8:
diff --git a/runtime/autoload/rustfmt.vim b/runtime/autoload/rustfmt.vim
new file mode 100644
index 0000000000..a689b5e00d
--- /dev/null
+++ b/runtime/autoload/rustfmt.vim
@@ -0,0 +1,107 @@
+" Author: Stephen Sugden <stephen@stephensugden.com>
+"
+" Adapted from https://github.com/fatih/vim-go
+" For bugs, patches and license go to https://github.com/rust-lang/rust.vim
+
+if !exists("g:rustfmt_autosave")
+	let g:rustfmt_autosave = 0
+endif
+
+if !exists("g:rustfmt_command")
+	let g:rustfmt_command = "rustfmt"
+endif
+
+if !exists("g:rustfmt_options")
+	let g:rustfmt_options = ""
+endif
+
+if !exists("g:rustfmt_fail_silently")
+	let g:rustfmt_fail_silently = 0
+endif
+
+let s:got_fmt_error = 0
+
+function! s:RustfmtCommandRange(filename, line1, line2)
+	let l:arg = {"file": shellescape(a:filename), "range": [a:line1, a:line2]}
+	return printf("%s %s --write-mode=overwrite --file-lines '[%s]'", g:rustfmt_command, g:rustfmt_options, json_encode(l:arg))
+endfunction
+
+function! s:RustfmtCommand(filename)
+	return g:rustfmt_command . " --write-mode=overwrite " . g:rustfmt_options . " " . shellescape(a:filename)
+endfunction
+
+function! s:RunRustfmt(command, curw, tmpname)
+	if exists("*systemlist")
+		let out = systemlist(a:command)
+	else
+		let out = split(system(a:command), '\r\?\n')
+	endif
+
+	if v:shell_error == 0 || v:shell_error == 3
+		" remove undo point caused via BufWritePre
+		try | silent undojoin | catch | endtry
+
+		" Replace current file with temp file, then reload buffer
+		call rename(a:tmpname, expand('%'))
+		silent edit!
+		let &syntax = &syntax
+
+		" only clear location list if it was previously filled to prevent
+		" clobbering other additions
+		if s:got_fmt_error
+			let s:got_fmt_error = 0
+			call setloclist(0, [])
+			lwindow
+		endif
+	elseif g:rustfmt_fail_silently == 0
+		" otherwise get the errors and put them in the location list
+		let errors = []
+
+		for line in out
+			" src/lib.rs:13:5: 13:10 error: expected `,`, or `}`, found `value`
+			let tokens = matchlist(line, '^\(.\{-}\):\(\d\+\):\(\d\+\):\s*\(\d\+:\d\+\s*\)\?\s*error: \(.*\)')
+			if !empty(tokens)
+				call add(errors, {"filename": @%,
+						 \"lnum":     tokens[2],
+						 \"col":      tokens[3],
+						 \"text":     tokens[5]})
+			endif
+		endfor
+
+		if empty(errors)
+			% | " Couldn't detect rustfmt error format, output errors
+		endif
+
+		if !empty(errors)
+			call setloclist(0, errors, 'r')
+			echohl Error | echomsg "rustfmt returned error" | echohl None
+		endif
+
+		let s:got_fmt_error = 1
+		lwindow
+		" We didn't use the temp file, so clean up
+		call delete(a:tmpname)
+	endif
+
+	call winrestview(a:curw)
+endfunction
+
+function! rustfmt#FormatRange(line1, line2)
+	let l:curw = winsaveview()
+	let l:tmpname = expand("%:p:h") . "/." . expand("%:p:t") . ".rustfmt"
+	call writefile(getline(1, '$'), l:tmpname)
+
+	let command = s:RustfmtCommandRange(l:tmpname, a:line1, a:line2)
+
+	call s:RunRustfmt(command, l:curw, l:tmpname)
+endfunction
+
+function! rustfmt#Format()
+	let l:curw = winsaveview()
+	let l:tmpname = expand("%:p:h") . "/." . expand("%:p:t") . ".rustfmt"
+	call writefile(getline(1, '$'), l:tmpname)
+
+	let command = s:RustfmtCommand(l:tmpname)
+
+	call s:RunRustfmt(command, l:curw, l:tmpname)
+endfunction
diff --git a/runtime/compiler/cargo.vim b/runtime/compiler/cargo.vim
new file mode 100644
index 0000000000..bd48666bc9
--- /dev/null
+++ b/runtime/compiler/cargo.vim
@@ -0,0 +1,35 @@
+" Vim compiler file
+" Compiler:         Cargo Compiler
+" Maintainer:       Damien Radtke <damienradtke@gmail.com>
+" Latest Revision:  2014 Sep 24
+" For bugs, patches and license go to https://github.com/rust-lang/rust.vim
+
+if exists('current_compiler')
+	finish
+endif
+runtime compiler/rustc.vim
+let current_compiler = "cargo"
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+if exists(':CompilerSet') != 2
+	command -nargs=* CompilerSet setlocal <args>
+endif
+
+if exists('g:cargo_makeprg_params')
+	execute 'CompilerSet makeprg=cargo\ '.escape(g:cargo_makeprg_params, ' \|"').'\ $*'
+else
+	CompilerSet makeprg=cargo\ $*
+endif
+
+" Ignore general cargo progress messages
+CompilerSet errorformat+=
+			\%-G%\\s%#Downloading%.%#,
+			\%-G%\\s%#Compiling%.%#,
+			\%-G%\\s%#Finished%.%#,
+			\%-G%\\s%#error:\ Could\ not\ compile\ %.%#,
+			\%-G%\\s%#To\ learn\ more\\,%.%#
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
diff --git a/runtime/compiler/rustc.vim b/runtime/compiler/rustc.vim
new file mode 100644
index 0000000000..c27bdc9c0c
--- /dev/null
+++ b/runtime/compiler/rustc.vim
@@ -0,0 +1,46 @@
+" Vim compiler file
+" Compiler:         Rust Compiler
+" Maintainer:       Chris Morgan <me@chrismorgan.info>
+" Latest Revision:  2013 Jul 12
+" For bugs, patches and license go to https://github.com/rust-lang/rust.vim
+
+if exists("current_compiler")
+	finish
+endif
+let current_compiler = "rustc"
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+if exists(":CompilerSet") != 2
+	command -nargs=* CompilerSet setlocal <args>
+endif
+
+if exists("g:rustc_makeprg_no_percent") && g:rustc_makeprg_no_percent != 0
+	CompilerSet makeprg=rustc
+else
+	CompilerSet makeprg=rustc\ \%
+endif
+
+" Old errorformat (before nightly 2016/08/10)
+CompilerSet errorformat=
+			\%f:%l:%c:\ %t%*[^:]:\ %m,
+			\%f:%l:%c:\ %*\\d:%*\\d\ %t%*[^:]:\ %m,
+			\%-G%f:%l\ %s,
+			\%-G%*[\ ]^,
+			\%-G%*[\ ]^%*[~],
+			\%-G%*[\ ]...
+
+" New errorformat (after nightly 2016/08/10)
+CompilerSet errorformat+=
+			\%-G,
+			\%-Gerror:\ aborting\ %.%#,
+			\%-Gerror:\ Could\ not\ compile\ %.%#,
+			\%Eerror:\ %m,
+			\%Eerror[E%n]:\ %m,
+			\%Wwarning:\ %m,
+			\%Inote:\ %m,
+			\%C\ %#-->\ %f:%l:%c
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
diff --git a/runtime/doc/Makefile b/runtime/doc/Makefile
index 33a09be429..1a0e841973 100644
--- a/runtime/doc/Makefile
+++ b/runtime/doc/Makefile
@@ -30,6 +30,7 @@ DOCS = \
 	filetype.txt \
 	fold.txt \
 	ft_ada.txt \
+	ft_rust.txt \
 	ft_sql.txt \
 	gui.txt \
 	gui_w32.txt \
@@ -165,6 +166,7 @@ HTMLS = \
 	filetype.html \
 	fold.html \
 	ft_ada.html \
+	ft_rust.html \
 	ft_sql.html \
 	gui.html \
 	gui_w32.html \
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index ff1b71feeb..db0a7561fe 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 8.0.  Last change: 2017 Mar 18
+*eval.txt*	For Vim version 8.0.  Last change: 2017 Mar 21
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2261,12 +2261,13 @@ readfile({fname} [, {binary} [, {max}]])
 reltime([{start} [, {end}]])	List	get time value
 reltimefloat({time})		Float	turn the time value into a Float
 reltimestr({time})		String	turn time value into a String
-remote_expr({server}, {string} [, {idvar}])
+remote_expr({server}, {string} [, {idvar} [, {timeout}]])
 				String	send expression
 remote_foreground({server})	Number	bring Vim server to the foreground
 remote_peek({serverid} [, {retvar}])
 				Number	check for reply string
-remote_read({serverid})		String	read reply string
+remote_read({serverid} [, {timeout}])
+				String	read reply string
 remote_send({server}, {string} [, {idvar}])
 				String	send key sequence
 remote_startserver({name})	none	become server {name}
diff --git a/runtime/doc/filetype.txt b/runtime/doc/filetype.txt
index 4b0a185da2..8f58d76d9c 100644
--- a/runtime/doc/filetype.txt
+++ b/runtime/doc/filetype.txt
@@ -1,4 +1,4 @@
-*filetype.txt*  For Vim version 8.0.  Last change: 2017 Jan 04
+*filetype.txt*  For Vim version 8.0.  Last change: 2017 Mar 21
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -663,6 +663,12 @@ Since the text for this plugin is rather long it has been put in a separate
 file: |pi_spec.txt|.
 
 
+RUST							*ft-rust*
+
+Since the text for this plugin is rather long it has been put in a separate
+file: |ft_rust.txt|.
+
+
 SQL							*ft-sql*
 
 Since the text for this plugin is rather long it has been put in a separate
diff --git a/runtime/doc/fold.txt b/runtime/doc/fold.txt
index c3f413232a..bdf4a48514 100644
--- a/runtime/doc/fold.txt
+++ b/runtime/doc/fold.txt
@@ -1,4 +1,4 @@
-*fold.txt*      For Vim version 8.0.  Last change: 2016 Jan 02
+*fold.txt*      For Vim version 8.0.  Last change: 2017 Mar 18
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -79,7 +79,7 @@ This will call a function to compute the fold level: >
 	:set foldexpr=MyFoldLevel(v:lnum)
 This will make a fold out of paragraphs separated by blank lines: >
 	:set foldexpr=getline(v:lnum)=~'^\\s*$'&&getline(v:lnum+1)=~'\\S'?'<1':1
-this does the same: >
+This does the same: >
 	:set foldexpr=getline(v:lnum-1)=~'^\\s*$'&&getline(v:lnum)=~'\\S'?'>1':1
 
 Note that backslashes must be used to escape characters that ":set" handles
@@ -203,7 +203,7 @@ and the level given by the marker:
 1. If a marker with the same fold level is encountered, the previous fold
    ends and another fold with the same level starts.
 2. If a marker with a higher fold level is found, a nested fold is started.
-3. if a marker with a lower fold level is found, all folds up to and including
+3. If a marker with a lower fold level is found, all folds up to and including
    this level end and a fold with the specified level starts.
 
 The number indicates the fold level.  A zero cannot be used (a marker with
diff --git a/runtime/doc/ft_rust.txt b/runtime/doc/ft_rust.txt
new file mode 100644
index 0000000000..b6e974e371
--- /dev/null
+++ b/runtime/doc/ft_rust.txt
@@ -0,0 +1,237 @@
+*ft_rust.txt*      Filetype plugin for Rust
+
+==============================================================================
+CONTENTS                                                      *rust* *ft-rust*
+
+1. Introduction                                                   |rust-intro|
+2. Settings                                                    |rust-settings|
+3. Commands                                                    |rust-commands|
+4. Mappings                                                    |rust-mappings|
+
+==============================================================================
+INTRODUCTION                                                      *rust-intro*
+
+This plugin provides syntax and supporting functionality for the Rust
+filetype.
+
+==============================================================================
+SETTINGS                                                       *rust-settings*
+
+This plugin has a few variables you can define in your vimrc that change the
+behavior of the plugin.
+
+                                                                *g:rustc_path*
+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"
+<
+
+                                                  *g:rustc_makeprg_no_percent*
+g:rustc_makeprg_no_percent~
+	Set this option to 1 to have 'makeprg' default to "rustc" instead of
+	"rustc %": >
+	    let g:rustc_makeprg_no_percent = 1
+<
+
+                                                              *g:rust_conceal*
+g:rust_conceal~
+	Set this option to turn on the basic |conceal| support: >
+	    let g:rust_conceal = 1
+<
+
+                                                     *g:rust_conceal_mod_path*
+g:rust_conceal_mod_path~
+	Set this option to turn on |conceal| for the path connecting token
+	"::": >
+	    let g:rust_conceal_mod_path = 1
+<
+
+                                                          *g:rust_conceal_pub*
+g:rust_conceal_pub~
+	Set this option to turn on |conceal| for the "pub" token: >
+	    let g:rust_conceal_pub = 1
+<
+
+                                                     *g:rust_recommended_style*
+g:rust_recommended_style~
+        Set this option to enable vim indentation and textwidth settings to
+        conform to style conventions of the rust standard library (i.e. use 4
+        spaces for indents and sets 'textwidth' to 99). This option is enabled
+	by default. To disable it: >
+	    let g:rust_recommended_style = 0
+<
+
+                                                                 *g:rust_fold*
+g:rust_fold~
+	Set this option to turn on |folding|: >
+	    let g:rust_fold = 1
+<
+	Value		Effect ~
+	0		No folding
+	1		Braced blocks are folded. All folds are open by
+			default.
+	2		Braced blocks are folded. 'foldlevel' is left at the
+			global value (all folds are closed by default).
+
+                                                  *g:rust_bang_comment_leader*
+g:rust_bang_comment_leader~
+	Set this option to 1 to preserve the leader on multi-line doc comments
+	using the /*! syntax: >
+	    let g:rust_bang_comment_leader = 1
+<
+
+                                                 *g:ftplugin_rust_source_path*
+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'
+<
+
+                                                       *g:rustfmt_command*
+g:rustfmt_command~
+	Set this option to the name of the 'rustfmt' executable in your $PATH. If
+	not specified it defaults to 'rustfmt' : >
+	    let g:rustfmt_command = 'rustfmt'
+<
+                                                       *g:rustfmt_autosave*
+g:rustfmt_autosave~
+	Set this option to 1 to run |:RustFmt| automatically when saving a
+	buffer. If not specified it defaults to 0 : >
+	    let g:rustfmt_autosave = 0
+<
+                                                       *g:rustfmt_fail_silently*
+g:rustfmt_fail_silently~
+	Set this option to 1 to prevent 'rustfmt' from populating the
+	|location-list| with errors. If not specified it defaults to 0: >
+	    let g:rustfmt_fail_silently = 0
+<
+                                                       *g:rustfmt_options*
+g:rustfmt_options~
+	Set this option to a string of options to pass to 'rustfmt'. The
+	write-mode is already set to 'overwrite'. If not specified it
+	defaults to '' : >
+	    let g:rustfmt_options = ''
+<
+
+                                                          *g:rust_playpen_url*
+g:rust_playpen_url~
+	Set this option to override the url for the playpen to use: >
+	    let g:rust_playpen_url = 'https://play.rust-lang.org/'
+<
+
+                                                        *g:rust_shortener_url*
+g:rust_shortener_url~
+	Set this option to override the url for the url shortener: >
+	    let g:rust_shortener_url = 'https://is.gd/'
+<
+
+
+==============================================================================
+COMMANDS                                                       *rust-commands*
+
+:RustRun  [args]                                                    *:RustRun*
+:RustRun! [rustc-args] [--] [args]
+		Compiles and runs the current file. If it has unsaved changes,
+		it will be saved first using |:update|. If the current file is
+		an unnamed buffer, it will be written to a temporary file
+		first. The compiled binary is always placed in a temporary
+		directory, but is run from the current directory.
+
+		The arguments given to |:RustRun| will be passed to the
+		compiled binary.
+
+		If ! is specified, the arguments are passed to rustc instead.
+		A "--" argument will separate the rustc arguments from the
+		arguments passed to the binary.
+
+		If |g:rustc_path| is defined, it is used as the path to rustc.
+		Otherwise it is assumed rustc can be found in $PATH.
+
+:RustExpand  [args]                                              *:RustExpand*
+:RustExpand! [TYPE] [args]
+		Expands the current file using --pretty and displays the
+		results in a new split. If the current file has unsaved
+		changes, it will be saved first using |:update|. If the
+		current file is an unnamed buffer, it will be written to a
+		temporary file first.
+
+		The arguments given to |:RustExpand| will be passed to rustc.
+		This is largely intended for specifying various --cfg
+		configurations.
+
+		If ! is specified, the first argument is the expansion type to
+		pass to rustc --pretty. Otherwise it will default to
+		"expanded".
+
+		If |g:rustc_path| is defined, it is used as the path to rustc.
+		Otherwise it is assumed rustc can be found in $PATH.
+
+:RustEmitIr [args]                                               *:RustEmitIr*
+		Compiles the current file to LLVM IR and displays the results
+		in a new split. If the current file has unsaved changes, it
+		will be saved first using |:update|. If the current file is an
+		unnamed buffer, it will be written to a temporary file first.
+
+		The arguments given to |:RustEmitIr| will be passed to rustc.
+
+		If |g:rustc_path| is defined, it is used as the path to rustc.
+		Otherwise it is assumed rustc can be found in $PATH.
+
+:RustEmitAsm [args]                                             *:RustEmitAsm*
+		Compiles the current file to assembly and displays the results
+		in a new split. If the current file has unsaved changes, it
+		will be saved first using |:update|. If the current file is an
+		unnamed buffer, it will be written to a temporary file first.
+
+		The arguments given to |:RustEmitAsm| will be passed to rustc.
+
+		If |g:rustc_path| is defined, it is used as the path to rustc.
+		Otherwise it is assumed rustc can be found in $PATH.
+
+:RustPlay                                                          *:RustPlay*
+		This command will only work if you have web-api.vim installed
+		(available at https://github.com/mattn/webapi-vim).  It sends the
+		current selection, or if nothing is selected, the entirety of the
+		current buffer to the Rust playpen, and emits a message with the
+		shortened URL to the playpen.
+
+		|g:rust_playpen_url| is the base URL to the playpen, by default
+		"https://play.rust-lang.org/".
+
+		|g:rust_shortener_url| is the base url for the shorterner, by
+		default "https://is.gd/"
+
+:RustFmt                                                       *:RustFmt*
+		Runs |g:rustfmt_command| on the current buffer. If
+		|g:rustfmt_options| is set then those will be passed to the
+		executable.
+
+		If |g:rustfmt_fail_silently| is 0 (the default) then it
+		will populate the |location-list| with the errors from
+		|g:rustfmt_command|. If |g:rustfmt_fail_silently| is set to 1
+		then it will not populate the |location-list|.
+
+:RustFmtRange                                                  *:RustFmtRange*
+		Runs |g:rustfmt_command| with selected range. See
+		|:RustFmt| for any other information.
+
+==============================================================================
+MAPPINGS                                                       *rust-mappings*
+
+This plugin defines mappings for |[[| and |]]| to support hanging indents.
+
+It also has a few other mappings:
+
+							*rust_<D-r>*
+<D-r>			Executes |:RustRun| with no arguments.
+			Note: This binding is only available in MacVim.
+
+							*rust_<D-R>*
+<D-R>			Populates the command line with |:RustRun|! using the
+			arguments given to the last invocation, but does not
+			execute it.
+			Note: T