Update runtime files
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 932570c..c9db884 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 8.2.  Last change: 2022 Jun 02
+*options.txt*	For Vim version 8.2.  Last change: 2022 Jun 07
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
diff --git a/runtime/doc/tags b/runtime/doc/tags
index e291a5d..95943d7 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -1916,6 +1916,8 @@
 40.3	usr_40.txt	/*40.3*
 41.1	usr_41.txt	/*41.1*
 41.10	usr_41.txt	/*41.10*
+41.11	usr_41.txt	/*41.11*
+41.12	usr_41.txt	/*41.12*
 41.2	usr_41.txt	/*41.2*
 41.3	usr_41.txt	/*41.3*
 41.4	usr_41.txt	/*41.4*
@@ -1950,6 +1952,7 @@
 45.5	usr_45.txt	/*45.5*
 50.1	usr_50.txt	/*50.1*
 50.2	usr_50.txt	/*50.2*
+50.3	usr_50.txt	/*50.3*
 51.1	usr_51.txt	/*51.1*
 51.2	usr_51.txt	/*51.2*
 51.3	usr_51.txt	/*51.3*
@@ -8046,6 +8049,7 @@
 lcs-eol	options.txt	/*lcs-eol*
 lcs-extends	options.txt	/*lcs-extends*
 lcs-lead	options.txt	/*lcs-lead*
+lcs-leadmultispace	options.txt	/*lcs-leadmultispace*
 lcs-multispace	options.txt	/*lcs-multispace*
 lcs-nbsp	options.txt	/*lcs-nbsp*
 lcs-precedes	options.txt	/*lcs-precedes*
diff --git a/runtime/doc/terminal.txt b/runtime/doc/terminal.txt
index f68bf42..4004c63 100644
--- a/runtime/doc/terminal.txt
+++ b/runtime/doc/terminal.txt
@@ -1,4 +1,4 @@
-*terminal.txt*	For Vim version 8.2.  Last change: 2022 May 23
+*terminal.txt*	For Vim version 8.2.  Last change: 2022 Jun 09
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -101,7 +101,7 @@
 mode, just like this works in any other mode.
 							*t_CTRL-W_CTRL-C*
 CTRL-W CTRL-C can be typed to forcefully end the job.  On MS-Windows a
-CTRL-BREAK will also kill the job.
+CTRL-Break will also kill the job.
 
 If you type CTRL-C the effect depends on what the pty has been configured to
 do.  For simple commands this causes a SIGINT to be sent to the job, which
diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index 8cf50b3..bd86b20 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -1,4 +1,4 @@
-*todo.txt*      For Vim version 8.2.  Last change: 2022 Jun 05
+*todo.txt*      For Vim version 8.2.  Last change: 2022 Jun 09
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -245,6 +245,9 @@
 
 PR to support %e and %k in 'errorformat'. #9624
 
+With a window height of 6 and 'scrolloff' set to 3, using "j" does not scroll
+evenly. (#10545)
+
 Idea: when typing ":e /some/dir/" and "dir" does not exist, highlight in red.
 
 ":set &shellpipe" and ":set &shellredir" should use the logic from
@@ -306,6 +309,8 @@
 
 globpath() does not use 'wildignorecase' at all? (related to #8350)
 
+Add a "--gui-dialog-file" argument, to be used in tests to avoid getting stuck.
+
 Add 'termguiattr' option, use "gui=" attributes in the terminal?  Would work
 with 'termguicolors'. #1740
 
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 6d13536..ba3cd2e 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -17,8 +17,10 @@
 |41.6|	Using functions
 |41.7|	Defining a function
 |41.8|	Lists and Dictionaries
-|41.9|	Exceptions
-|41.10|	Various remarks
+|41.9|	White space
+|41.10|	Line continuation
+|41.11|	Comments
+|41.12|	Fileformat
 
      Next chapter: |usr_42.txt|  Add new menus
  Previous chapter: |usr_40.txt|  Make new commands
@@ -112,7 +114,7 @@
 TRYING OUT EXAMPLES
 
 You can easily try out most examples in these help files without saving the
-commands in a file.  For example, to try out the "for" loop above do this:
+commands to a file.  For example, to try out the "for" loop above do this:
 1. position the cursor on the "for"
 2. start Visual mode with "v"
 3. move down to the "endfor"
@@ -195,7 +197,7 @@
 	CamelCaseName
 	LENGTH
 
-Invalid names are "foo+bar" and "6var".
+Invalid names are "foo.bar" and "6var".
 
 Some variables are global.  To see a list of currently defined global
 variables type this command: >
@@ -684,8 +686,8 @@
 one as flags.  The "W" flag means the search doesn't wrap around the end of
 the file.
 
-Using the  `call` command is optional in |Vim9| script.  This works the same
-way and also works in legacy script and on the command line: >
+Using the  `call` command is optional in |Vim9| script.  It is required in
+legacy script and on the command line: >
 
 	call search("Date: ", "W")
 
@@ -711,7 +713,7 @@
 
 	:substitute/\a/*/g
 
-Using the functions becomes more interesting when you do more work before and
+Using the functions becomes interesting when you do more work before and
 after the substitute() call.
 
 
@@ -1402,8 +1404,9 @@
 	  smaller = num2
 	endif
 
-The variable "smaller" is a local variable.  Variables used inside a function
-are local unless prefixed by something like "g:", "w:", or "s:".
+The variable "smaller" is a local variable.  It is declared to be a number,
+that way Vim can warn you for any mistakes.  Variables used inside a function
+are local unless prefixed by something like "g:", "w:", or "b:".
 
 	Note:
 	To access a global variable from inside a function you must prepend
@@ -1469,6 +1472,10 @@
 	  echo text
 	enddef
 
+If you want to return any kind of value, you can use the "any" return type: >
+	def GetValue(): any
+This disables type checking for the return value, use only when needed.
+
 It is also possible to define a legacy function with `function` and
 `endfunction`.  These do not have types and are not compiled.  Therefore they
 execute much slower.
@@ -1485,47 +1492,12 @@
 
 If you call this function with: >
 
-	:10,15call Number()
+	:10,15Number()
 
 The function will be called six times, starting on line 10 and ending on line
 15.
 
 
-VARIABLE NUMBER OF ARGUMENTS
-
-Vim enables you to define functions that have a variable number of arguments.
-The following command, for instance, defines a function that must have 1
-argument (start) and can have up to 20 additional arguments: >
-
-	def Show(start: string, ...items: list<string>)
-
-The variable "items" will be a list in the function containing the extra
-arguments.  You can use it like any list, for example: >
-
-	def Show(start: string, ...items: list<string>)
-	  echohl Title
-	  echo "start is " .. start
-	  echohl None
-	  for index in range(len(items))
-	    echon $"  Arg {index} is {items[index]}"
-	  endfor
-	  echo
-	enddef
-
-You can call it like this: >
-
-	Show('Title', 'one', 'two', 'three')
-<	start is Title  Arg 0 is one  Arg 1 is two  Arg 2 is three ~
-	
-This uses the `echohl` command to specify the highlighting used for the
-following `echo` command.  `echohl None` stops it again.  The `echon` command
-works like `echo`, but doesn't output a line break.
-
-If you call it with one argument the "items" list will be empty.
-`range(len(items))` returns a list with the indexes, what `for` loops over,
-we'll explain that further down.
-
-
 LISTING FUNCTIONS
 
 The `function` command lists the names and arguments of all user-defined
@@ -1606,6 +1578,11 @@
 with a capital.  Otherwise it could be confused with the name of a builtin
 function.
 
+
+FURTHER READING
+
+Using a variable number of arguments is introduced in section |50.2|.
+
 More information about defining your own functions here: |user-functions|.
 
 ==============================================================================
@@ -1766,95 +1743,16 @@
 For further reading see |Dictionaries|.
 
 ==============================================================================
-*41.9*	Exceptions
-
-Let's start with an example: >
-
-	try
-	   read ~/templates/pascal.tmpl
-	catch /E484:/
-	   echo "Sorry, the Pascal template file cannot be found."
-	endtry
-
-The `read` command will fail if the file does not exist.  Instead of
-generating an error message, this code catches the error and gives the user a
-message with more information.
-
-For the commands in between `try` and `endtry` errors are turned into
-exceptions.  An exception is a string.  In the case of an error the string
-contains the error message.  And every error message has a number.  In this
-case, the error we catch contains "E484:".  This number is guaranteed to stay
-the same (the text may change, e.g., it may be translated).
-
-Besides being able to give a nice error message, Vim will also continue
-executing commands after the `:endtry`.  Otherwise, once an uncaught error is
-encountered, execution of the script/function/mapping will be aborted.
-
-When the `read` command causes another error, the pattern "E484:" will not
-match in it.  Thus this exception will not be caught and result in the usual
-error message and execution is aborted.
-
-You might be tempted to do this: >
-
-	try
-	   read ~/templates/pascal.tmpl
-	catch
-	   echo "Sorry, the Pascal template file cannot be found."
-	endtry
-
-This means all errors are caught.  But then you will not see an error that
-would indicate a completely different problem, such as "E21: Cannot make
-changes, 'modifiable' is off".  Think twice before you catch any error!
-
-Another useful mechanism is the `finally` command: >
-
-	var tmp = tempname()
-	try
-	   exe ":.,$write " .. tmp
-	   exe "!filter " .. tmp
-	   :.,$delete
-	   exe ":$read " .. tmp
-	finally
-	   delete(tmp)
-	endtry
-
-This filters the lines from the cursor until the end of the file through the
-"filter" command, which takes a file name argument.  No matter if the
-filtering works, if something goes wrong in between `try` and `finally` or the
-user cancels the filtering by pressing CTRL-C, the `delete(tmp)` call is
-always executed.  This makes sure you don't leave the temporary file behind.
-
-The `finally` does not catch the exception, the error will still abort
-further execution.
-
-More information about exception handling can be found in the reference
-manual: |exception-handling|.
-
-==============================================================================
-*41.10*	Various remarks
-
-Here are a few items that are useful to know when writing Vim scripts.
-
-
-FILEFORMAT
-
-The end-of-line character depends on the system.  For Vim scripts it is
-recommended to always use the Unix fileformat.  This also works on any other
-system.  That way you can copy your Vim scripts from MS-Windows to Unix and
-they still work.  See |:source_crnl|.  To be sure it is set right, do this
-before writing the file: >
-
-	:setlocal fileformat=unix
-
-
-WHITE SPACE
+*41.9*	White space
 
 Blank lines are allowed and ignored.
 
 Leading whitespace characters (blanks and TABs) are always ignored.
 
 Trailing whitespace is often ignored, but not always.  One command that
-includes it is `map`.
+includes it is `map`.  You have to watch out for that, it can cause hard to
+understand mistakes.  A generic solution is to never use trailing white space,
+unless you really need it.
 
 To include a whitespace character in the value of an option, it must be
 escaped by a "\" (backslash)  as in the following example: >
@@ -1876,8 +1774,39 @@
 If you use white space sensibly it will just work.  When not you will get an
 error message telling you where white space is missing or should be removed.
 
+==============================================================================
+*41.10*	Line continuation
 
-COMMENTS
+In legacy Vim script line continuation is done by preceding a continuation
+line with a backslash: >
+	let mylist = [
+			\ 'one',
+			\ 'two',
+			\ ]
+
+This requires the 'cpo' option to exclude the "C" flag.  Normally this is done
+by putting this at the start of the script: >
+	let s:save_cpo = &cpo
+	set cpo&vim
+
+And restore the option at the end of the script: >
+	let &cpo = s:save_cpo
+	unlet s:save_cpo
+
+A few more details can be found here: |line-continuation|.
+
+In |Vim9| script the backslash can still be used, but in most places it is not
+needed: >
+	var mylist = [
+			'one',
+			'two',
+			]
+
+Also, the 'cpo' option does not need to be changed.  See
+|vim9-line-continuation| for details.
+
+==============================================================================
+*41.11*	Comments
 
 In |Vim9| script the character # starts a comment.  That character and
 everything after it until the end-of-line is considered a comment and
@@ -1933,11 +1862,21 @@
 	echo "this is a Vim script"
 	quit
 
+==============================================================================
+*41.12*	Fileformat
 
-Advance information about writing Vim script is in |usr_50.txt|.
+The end-of-line character depends on the system.  For Vim scripts it is
+recommended to always use the Unix fileformat.  This also works on any other
+system.  That way you can copy your Vim scripts from MS-Windows to Unix and
+they still work.  See |:source_crnl|.  To be sure it is set right, do this
+before writing the file: >
+
+	:setlocal fileformat=unix
 
 ==============================================================================
 
+Advance information about writing Vim script is in |usr_50.txt|.
+
 Next chapter: |usr_42.txt|  Add new menus
 
 Copyright: see |manual-copyright|  vim:tw=78:ts=8:noet:ft=help:norl:
diff --git a/runtime/doc/usr_50.txt b/runtime/doc/usr_50.txt
index 2dff27e..417bdd2 100644
--- a/runtime/doc/usr_50.txt
+++ b/runtime/doc/usr_50.txt
@@ -5,46 +5,116 @@
 			 Advanced Vim script writing
 
 
-|50.1|	Line continuation
-|50.2|	Restoring the view
+|50.1|	Exceptions
+|50.2|    Function with variable number of arguments
+|50.3|	Restoring the view
 
      Next chapter: |usr_51.txt|  Create a plugin
  Previous chapter: |usr_45.txt|  Select your language (local)
 Table of contents: |usr_toc.txt|
 
 ==============================================================================
-*50.1*	Line continuation
+*50.1*	Exceptions
 
-In legacy Vim script line continuation is done by preceding a continuation
-line with a backslash: >
-	let mylist = [
-			\ 'one',
-			\ 'two',
-			\ ]
+Let's start with an example: >
 
-This requires the 'cpo' option to exclude the "C" flag.  Normally this is done
-by putting this at the start of the script: >
-	let s:save_cpo = &cpo
-	set cpo&vim
+	try
+	   read ~/templates/pascal.tmpl
+	catch /E484:/
+	   echo "Sorry, the Pascal template file cannot be found."
+	endtry
 
-And restore the option at the end of the script: >
-	let &cpo = s:save_cpo
-	unlet s:save_cpo
+The `read` command will fail if the file does not exist.  Instead of
+generating an error message, this code catches the error and gives the user a
+message with more information.
 
-A few more details can be found here: |line-continuation|.
+For the commands in between `try` and `endtry` errors are turned into
+exceptions.  An exception is a string.  In the case of an error the string
+contains the error message.  And every error message has a number.  In this
+case, the error we catch contains "E484:".  This number is guaranteed to stay
+the same (the text may change, e.g., it may be translated).
 
-In |Vim9| script the backslash can still be used, but in most places it is not
-needed: >
-	var mylist = [
-			'one',
-			'two',
-			]
+Besides being able to give a nice error message, Vim will also continue
+executing commands after the `:endtry`.  Otherwise, once an uncaught error is
+encountered, execution of the script/function/mapping will be aborted.
 
-Also, the 'cpo' option does not need to be changed.  See
-|vim9-line-continuation| for details.
+When the `read` command causes another error, the pattern "E484:" will not
+match in it.  Thus this exception will not be caught and result in the usual
+error message and execution is aborted.
+
+You might be tempted to do this: >
+
+	try
+	   read ~/templates/pascal.tmpl
+	catch
+	   echo "Sorry, the Pascal template file cannot be found."
+	endtry
+
+This means all errors are caught.  But then you will not see an error that
+would indicate a completely different problem, such as "E21: Cannot make
+changes, 'modifiable' is off".  Think twice before you catch any error!
+
+Another useful mechanism is the `finally` command: >
+
+	var tmp = tempname()
+	try
+	   exe ":.,$write " .. tmp
+	   exe "!filter " .. tmp
+	   :.,$delete
+	   exe ":$read " .. tmp
+	finally
+	   delete(tmp)
+	endtry
+
+This filters the lines from the cursor until the end of the file through the
+"filter" command, which takes a file name argument.  No matter if the
+filtering works, if something goes wrong in between `try` and `finally` or the
+user cancels the filtering by pressing CTRL-C, the `delete(tmp)` call is
+always executed.  This makes sure you don't leave the temporary file behind.
+
+The `finally` does not catch the exception, the error will still abort
+further execution.
+
+More information about exception handling can be found in the reference
+manual: |exception-handling|.
 
 ==============================================================================
-*50.2*	Restoring the view
+*50.2*	Function with variable number of arguments
+
+Vim enables you to define functions that have a variable number of arguments.
+The following command, for instance, defines a function that must have 1
+argument (start) and can have up to 20 additional arguments: >
+
+	def Show(start: string, ...items: list<string>)
+
+The variable "items" will be a list in the function containing the extra
+arguments.  You can use it like any list, for example: >
+
+	def Show(start: string, ...items: list<string>)
+	  echohl Title
+	  echo "start is " .. start
+	  echohl None
+	  for index in range(len(items))
+	    echon $"  Arg {index} is {items[index]}"
+	  endfor
+	  echo
+	enddef
+
+You can call it like this: >
+
+	Show('Title', 'one', 'two', 'three')
+<	start is Title  Arg 0 is one  Arg 1 is two  Arg 2 is three ~
+	
+This uses the `echohl` command to specify the highlighting used for the
+following `echo` command.  `echohl None` stops it again.  The `echon` command
+works like `echo`, but doesn't output a line break.
+
+If you call it with one argument the "items" list will be empty.
+`range(len(items))` returns a list with the indexes, what `for` loops over,
+we'll explain that further down.
+
+==============================================================================
+*50.3*	Restoring the view
 
 Sometimes you want to make a change and go back to where the cursor was.
 Restoring the relative position would also be nice, so that the same line
diff --git a/runtime/doc/usr_toc.txt b/runtime/doc/usr_toc.txt
index 268f7cf..79222f8 100644
--- a/runtime/doc/usr_toc.txt
+++ b/runtime/doc/usr_toc.txt
@@ -304,8 +304,10 @@
 		|41.6|	Using functions
 		|41.7|	Defining a function
 		|41.8|	Lists and Dictionaries
-		|41.9|	Exceptions
-		|41.10|	Various remarks
+		|41.9|	White space
+		|41.10|	Line continuation
+		|41.11|	Comments
+		|41.12|	Fileformat
 
 |usr_42.txt|  Add new menus
 		|42.1|	Introduction
@@ -342,8 +344,9 @@
 Writing Vim script ~
 
 |usr_50.txt|  Advanced Vim script writing
-		|50.1|	Line continuation
-		|50.2|	Restoring the view
+		|50.1|	Exceptions
+		|50.2|    Function with variable number of arguments
+		|50.3|	Restoring the view
 
 |usr_51.txt|  Write plugins
 		|51.1|	Writing a generic plugin
diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt
index 069dac4..9cd90d5 100644
--- a/runtime/doc/vim9.txt
+++ b/runtime/doc/vim9.txt
@@ -86,7 +86,7 @@
 	var count = 0
 	count += 3
 - Constants can be declared with `:final` and `:const`: >
-	final matches = []		  # add matches
+	final matches = []		  # add to the list later
 	const names = ['Betty', 'Peter']  # cannot be changed
 - `:final` cannot be used as an abbreviation of `:finally`.
 - Variables and functions are script-local by default.
@@ -177,12 +177,12 @@
 `:def` has no options like `:function` does: "range", "abort", "dict" or
 "closure".  A `:def` function always aborts on an error (unless `:silent!` was
 used for the command or the error was caught a `:try` block), does not get a
-range passed cannot be a "dict" function, and can always be a closure.
+range passed, cannot be a "dict" function, and can always be a closure.
 						*vim9-no-dict-function*
 Later classes will be added, which replaces the "dict function" mechanism.
 For now you will need to pass the dictionary explicitly: >
-	def DictFunc(d: dict<any>, arg: string)
-	   echo d[arg]
+	def DictFunc(self: dict<any>, arg: string)
+	   echo self[arg]
 	enddef
 	var ad = {item: 'value', func: DictFunc}
 	ad.func(ad, 'item')
@@ -223,7 +223,7 @@
 most useful in callbacks where you don't need it, but do need to give an
 argument to match the call.  E.g. when using map() two arguments are passed,
 the key and the value, to ignore the key: >
-	map(myList, (_, v) => v * 2)
+	map(numberList, (_, v) => v * 2)
 There is no error for using the "_" argument multiple times.  No type needs to
 be given.
 
@@ -234,7 +234,7 @@
 in a Vim9 script, the function is local to the script.  Like prefixing "s:" in
 legacy script.  To define a global function or variable the "g:" prefix must
 be used.  For functions in a script that is to be imported and in an autoload
-script "export" needs to be used. >
+script "export" needs to be used for those to be used elsewhere. >
 	def ThisFunction()          # script-local
 	def g:ThatFunction()        # global
 	export def Function()       # for import and import autoload
@@ -250,13 +250,20 @@
 	  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.
+Detail: this is because "Inner" will actually become a function reference to a
+function with a generated name.
+
+It is not possible to define a script-local function in a function.  You can
+define a local function and assign it to a script-local funcref (it must have
+been declared at the script level).  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:
 - in the function scope, in block scopes
-- in the script scope, possibly imported
+- in the script scope
+
+Imported functions are found with the prefix from the `:import` command.
 
 Since a script-local function reference can be used without "s:" the name must
 start with an upper case letter even when using the "s:" prefix.  In legacy
@@ -272,6 +279,7 @@
 they do not use "s:".  This matches what you see in the rest of the file.
 
 In legacy functions the use of "s:" for script items is required, as before.
+No matter if the script is Vim9 or legacy.
 
 In all cases the function must be defined before used.  That is when it is
 called, when `:defcompile` causes it to be compiled, or when code that calls
@@ -279,11 +287,13 @@
 
 The result is that functions and variables without a namespace can usually be
 found in the script, either defined there or imported.  Global functions and
-variables could be defined anywhere (good luck finding out where!).
+variables could be defined anywhere (good luck finding out where!  You can
+often see where it was last set using |:verbose|).
 							*E1102*
 Global functions can still be defined and deleted at nearly any time.  In
 Vim9 script script-local functions are defined once when the script is sourced
-and cannot be deleted or replaced.
+and cannot be deleted or replaced by itself (it can be by reloading the
+script).
 
 When compiling a function and a function call is encountered for a function
 that is not (yet) defined, the |FuncUndefined| autocommand is not triggered.
@@ -350,6 +360,13 @@
 	   inner = 0
 	endif
 	echo inner
+
+Although this is shorter and faster for simple values: >
+	var inner = 0
+	if cond
+	   inner = 5
+	endif
+	echo inner
 <							*E1025* *E1128*
 To intentionally hide a variable from code that follows, a block can be
 used: >
@@ -1945,13 +1962,14 @@
 backwards compatible with the good old Vi commands.
 
 Examples:
-- Drop `:call` for calling a function and `:eval` for manipulating data.
+- Drop `:call` for calling a function and `:eval` for evaluating an
+  expression.
 - Drop using a leading backslash for line continuation, automatically figure
   out where an expression ends.
 
 However, this does require that some things need to change:
 - Comments start with # instead of ", to avoid confusing them with strings.
-  This is good anyway, it is known from several popular languages.
+  This is good anyway, it is also used by several popular languages.
 - Ex command ranges need to be prefixed with a colon, to avoid confusion with
   expressions (single quote can be a string or a mark, "/" can be divide or a
   search command, etc.).
@@ -2081,12 +2099,13 @@
 	false: `false`, `v:false`, `0`, `0 > 9`
 Note that the number zero is false and the number one is true.  This is more
 permissive than most other languages.  It was done because many builtin
-functions return these values.
+functions return these values, and changing that causes more problems than it
+solves.  After using this for a while it turned out to work well.
 
 If you have any type of value and want to use it as a boolean, use the `!!`
 operator:
-	true: `!!'text'`, `!![99]`, `!!{'x': 1}`, `!!99`
-	false: `!!''`, `!![]`, `!!{}`
+	true: `!!'text'`   `!![99]`   `!!{'x': 1}`   `!!99`
+	false: `!!''`   `!![]`   `!!{}`
 
 From a language like JavaScript we have this handy construct: >
 	GetName() || 'unknown'
@@ -2108,19 +2127,20 @@
 mechanism is supported.  It is a variant to the existing `:source` command
 that works like one would expect:
 - Instead of making everything global by default, everything is script-local,
-  unless exported.
+  some of these are exported.
 - When importing a script the symbols that are imported are explicitly listed,
   avoiding name conflicts and failures if functionality is added later.
 - The mechanism allows for writing a big, long script with a very clear API:
-  the exported function(s) and class(es).
+  the exported functions, variables and classes.
 - By using relative paths loading can be much faster for an import inside of a
   package, no need to search many directories.
-- Once an import has been used, it can be cached and loading it again can be
-  avoided.
+- Once an import has been used, its items are cached and loading it again is
+  not needed.
 - The Vim-specific use of "s:" to make things script-local can be dropped.
 
-When sourcing a Vim9 script from a legacy script, only the items defined
-globally can be used, not the exported items.  Alternatives considered:
+When sourcing a Vim9 script (from a Vim9 or legacy script), only the items
+defined globally can be used, not the exported items.  Alternatives
+considered:
 - All the exported items become available as script-local items.  This makes
   it uncontrollable what items get defined and likely soon leads to trouble.
 - Use the exported items and make them global.  Disadvantage is that it's then
@@ -2128,7 +2148,7 @@
 - Completely disallow sourcing a Vim9 script, require using `:import`.  That
   makes it difficult to use scripts for testing, or sourcing them from the
   command line to try them out.
-Note that you can also use `:import` in legacy Vim script, see above.
+Note that you CAN also use `:import` in legacy Vim script, see above.
 
 
 Compiling functions early ~
@@ -2146,17 +2166,17 @@
 execute the script and compile the functions.  This means the script has to be
 parsed twice, which is slower, and some conditions at the script level, such
 as checking if a feature is supported, are hard to use.  An attempt was made
-to see if it works, but it turned out to be impossible to make work nicely.
+to see if it works, but it turned out to be impossible to make work well.
 
 It would be possible to compile all the functions at the end of the script.
 The drawback is that if a function never gets called, the overhead of
 compiling it counts anyway.  Since startup speed is very important, in most
 cases it's better to do it later and accept that syntax and type errors are
 only reported then.  In case these errors should be found early, e.g. when
-testing, the `:defcompile` command will help out.
+testing, a `:defcompile` command at the end of the script will help out.
 
 
-Why not use an embedded language? ~
+Why not use an existing embedded language? ~
 
 Vim supports interfaces to Perl, Python, Lua, Tcl and a few others.  But
 these interfaces have never become widely used, for various reasons.  When
@@ -2165,8 +2185,8 @@
 
 Still, plugin writers may find other languages more familiar, want to use
 existing libraries or see a performance benefit.  We encourage plugin authors
-to write code in any language and run it as an external tool, using jobs and
-channels.  We can try to make this easier somehow.
+to write code in any language and run it as an external process, using jobs
+and channels.  We can try to make this easier somehow.
 
 Using an external tool also has disadvantages.  An alternative is to convert
 the tool into Vim script.  For that to be possible without too much
@@ -2182,9 +2202,10 @@
 like real classes.  On top of that, it's quite slow, because of the use of
 dictionaries.
 
-The support of classes in Vim9 script is a "minimal common functionality" of
-class support in most languages.  It works much like Java, which is the most
-popular programming language.
+It would be good to support real classes, and this is planned for a leter
+version.  The support is a "minimal common functionality" of class support in
+most languages.  It will work much like Java, which is the most popular
+programming language.
 
 
 
diff --git a/runtime/ftplugin/cs.vim b/runtime/ftplugin/cs.vim
index 7c2cbda..f53ffcb 100644
--- a/runtime/ftplugin/cs.vim
+++ b/runtime/ftplugin/cs.vim
@@ -1,29 +1,43 @@
 " Vim filetype plugin file
-" Language:	C#
-" Maintainer:	Johannes Zellner <johannes@zellner.org>
-" Last Change:	Tue, 09 Mar 2004 14:09:33 CET
+" Language:            C#
+" Maintainer:          Nick Jensen <nickspoon@gmail.com>
+" Former Maintainer:   Johannes Zellner <johannes@zellner.org>
+" Last Change:         2021-12-07
+" License:             Vim (see :h license)
+" Repository:          https://github.com/nickspoons/vim-cs
 
-" Only do this when not done yet for this buffer
-if exists("b:did_ftplugin")
+if exists('b:did_ftplugin')
   finish
 endif
-
-" Don't load another plugin for this buffer
 let b:did_ftplugin = 1
-let s:keepcpo= &cpo
-set cpo&vim
+
+let s:save_cpo = &cpoptions
+set cpoptions&vim
 
 " Set 'formatoptions' to break comment lines but not other lines,
 " and insert the comment leader when hitting <CR> or using "o".
-setlocal fo-=t fo+=croql
+setlocal formatoptions-=t formatoptions+=croql
 
 " Set 'comments' to format dashed lists in comments.
 setlocal comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,:///,://
 
-if has("gui_win32") && !exists("b:browsefilter")
-    let b:browsefilter = "C# Source Files (*.cs)\t*.cs\n" .
-		       \ "All Files (*.*)\t*.*\n"
+let b:undo_ftplugin = 'setl com< fo<'
+
+if exists('loaded_matchit') && !exists('b:match_words')
+  " #if/#endif support included by default
+  let b:match_words = '\%(^\s*\)\@<=#\s*region\>:\%(^\s*\)\@<=#\s*endregion\>,'
+  let b:undo_ftplugin .= ' | unlet! b:match_words'
 endif
 
-let &cpo = s:keepcpo
-unlet s:keepcpo
+if (has('gui_win32') || has('gui_gtk')) && !exists('b:browsefilter')
+  let b:browsefilter = "C# Source Files (*.cs *.csx)\t*.cs;*.csx\n" .
+        \              "C# Project Files (*.csproj)\t*.csproj\n" .
+        \              "Visual Studio Solution Files (*.sln)\t*.sln\n" .
+        \              "All Files (*.*)\t*.*\n"
+  let b:undo_ftplugin .= ' | unlet! b:browsefilter'
+endif
+
+let &cpoptions = s:save_cpo
+unlet s:save_cpo
+
+" vim:et:sw=2:sts=2
diff --git a/runtime/import/dist/vimhelp.vim b/runtime/import/dist/vimhelp.vim
index 00cc79c..e0afd1f 100644
--- a/runtime/import/dist/vimhelp.vim
+++ b/runtime/import/dist/vimhelp.vim
@@ -7,7 +7,7 @@
   var buf: number = bufnr('%')
   var lnum: number = search('\*highlight-groups\*', 'cn')
   while getline(lnum) !~ '===' && lnum < line('$')
-    var word: string = getline(lnum)->matchstr('^\w\+\ze\t')
+    var word: string = getline(lnum)->matchstr('^\w\+\ze\s')
     if word->hlexists()
       var name = 'help-hl-' .. word
       if prop_type_list({bufnr: buf})->match(name) == -1
diff --git a/runtime/indent/cs.vim b/runtime/indent/cs.vim
index 76c12ef..acc3ba7 100644
--- a/runtime/indent/cs.vim
+++ b/runtime/indent/cs.vim
@@ -3,13 +3,10 @@
 " Maintainer:          Nick Jensen <nickspoon@gmail.com>
 " Former Maintainers:  Aquila Deus
 "                      Johannes Zellner <johannes@zellner.org>
-" Last Change:         2018-11-21
-" Filenames:           *.cs
+" Last Change:         2020-03-26
 " License:             Vim (see :h license)
 " Repository:          https://github.com/nickspoons/vim-cs
-"
 
-" Only load this indent file when no other was loaded.
 if exists('b:did_indent')
   finish
 endif
@@ -22,19 +19,23 @@
 setlocal indentexpr=GetCSIndent(v:lnum)
 
 function! s:IsCompilerDirective(line)
-  return a:line =~? '^\s*#'
+  " Exclude #region and #endregion - these should be indented normally
+  return a:line =~# '^\s*#' && !s:IsRegionDirective(a:line)
+endf
+
+function! s:IsRegionDirective(line)
+  return a:line =~# '^\s*#\s*region' || a:line =~# '^\s*#\s*endregion'
 endf
 
 function! s:IsAttributeLine(line)
-  return a:line =~? '^\s*\[[A-Za-z]' && a:line =~? '\]$'
+  return a:line =~# '^\s*\[[A-Za-z]' && a:line =~# '\]$'
 endf
 
 function! s:FindPreviousNonCompilerDirectiveLine(start_lnum)
   for delta in range(0, a:start_lnum)
     let lnum = a:start_lnum - delta
     let line = getline(lnum)
-    let is_directive = s:IsCompilerDirective(line)
-    if !is_directive
+    if !s:IsCompilerDirective(line) && !s:IsRegionDirective(line)
       return lnum
     endif
   endfor
@@ -58,8 +59,9 @@
   let lnum = s:FindPreviousNonCompilerDirectiveLine(a:lnum - 1)
   let previous_code_line = getline(lnum)
   if s:IsAttributeLine(previous_code_line)
-    let ind = indent(lnum)
-    return ind
+    return indent(lnum)
+  elseif s:IsRegionDirective(this_line)
+    return cindent(lnum)
   else
     return cindent(a:lnum)
   endif
diff --git a/runtime/syntax/cs.vim b/runtime/syntax/cs.vim
index b4cb648..722ddbe 100644
--- a/runtime/syntax/cs.vim
+++ b/runtime/syntax/cs.vim
@@ -3,13 +3,16 @@
 " Maintainer:          Nick Jensen <nickspoon@gmail.com>
 " Former Maintainers:  Anduin Withers <awithers@anduin.com>
 "                      Johannes Zellner <johannes@zellner.org>
-" Last Change:         2020-11-23
+" Last Change:         2022-03-01
 " Filenames:           *.cs
 " License:             Vim (see :h license)
 " Repository:          https://github.com/nickspoons/vim-cs
 "
-" REFERENCES:
-" [1] ECMA TC39: C# Language Specification (WD13Oct01.doc)
+" References:
+"   -   ECMA-334 5th Edition: C# Language Specification
+"       https://www.ecma-international.org/publications-and-standards/standards/ecma-334/
+"   -   C# Language Design: Draft 6th Edition and later proposals
+"       https://github.com/dotnet/csharplang
 
 if exists('b:current_syntax')
   finish
@@ -19,37 +22,72 @@
 set cpoptions&vim
 
 syn keyword	csType	bool byte char decimal double float int long object sbyte short string T uint ulong ushort var void dynamic
-syn keyword	csStorage	delegate enum interface namespace struct
+syn keyword	csType	nint nuint " contextual
+
+syn keyword	csStorage	enum interface namespace struct
+syn match	csStorage	"\<delegate\>"
 syn keyword	csRepeat	break continue do for foreach goto return while
 syn keyword	csConditional	else if switch
 syn keyword	csLabel	case default
-syn match	csOperatorError	display +::+
-syn match	csGlobal	display +global::+
-" user labels (see [1] 8.6 Statements)
-syn match	csLabel	display +^\s*\I\i*\s*:\%([^:]\)\@=+
-syn keyword	csModifier	abstract const extern internal override private protected public readonly sealed static virtual volatile
-syn keyword	csConstant	false null true
-syn keyword	csException	try catch finally throw when
-syn keyword	csLinq	ascending by descending equals from group in into join let on orderby select where
-syn keyword	csAsync	async await
 
-syn keyword	csUnspecifiedStatement	as base checked event fixed in is lock nameof operator out params ref sizeof stackalloc this unchecked unsafe using
-syn keyword	csUnsupportedStatement	add remove value
+syn match	csNamespaceAlias	"@\=\h\w*\ze\_s*::" display
+syn match	csGlobalNamespaceAlias	"global\ze\_s*::" display
+syn cluster	csNamespaceAlias	contains=csGlobalNamespaceAlias,csNamespaceAlias,csNamespaceAliasQualifier
+
+" user labels
+syn match	csLabel	display +^\s*\I\i*\s*:\%([^:]\)\@=+
+
+" Function pointers
+syn match	csType	"\<delegate\s*\*" contains=csOpSymbols nextgroup=csManagedModifier skipwhite skipempty
+syn keyword	csManagedModifier	managed unmanaged contained
+
+" Modifiers
+syn match	csUsingModifier	"\<global\ze\_s\+using\>"
+syn keyword	csAccessModifier	internal private protected public
+" TODO: in new out
+syn keyword	csModifier	abstract const event override readonly sealed static virtual volatile
+syn match	csModifier	"\<\%(extern\|fixed\|unsafe\)\>"
+syn match	csModifier	"\<partial\ze\_s\+\%(class\|struct\|interface\|record\|void\)\>"
+
+syn keyword	csException	try catch finally throw when
+syn keyword	csLinq	ascending by descending equals from group in into join let on orderby select
+syn match	csLinq	"\<where\>"
+
+" Type parameter constraint clause
+syn match	csStorage	"\<where\>\ze\_s\+@\=\h\w*\_s*:"
+
+" Async
+syn keyword	csAsyncModifier	async
+syn keyword	csAsyncOperator	await
+
+syn match	csStorage	"\<extern\ze\s\+alias\>"
+syn match	csStorage	"\%(\<extern\s\+\)\@16<=alias\>"
+
+syn match	csStatement	"\<\%(checked\|unchecked\|unsafe\)\ze\_s*{"
+syn match	csStatement	"\<fixed\ze\_s*("
+syn keyword	csStatement	lock
+syn match	csStatement	"\<yield\ze\_s\+\%(return\|break\)\>"
+
+syn match	csAccessor	"\<\%(get\|set\|init\|add\|remove\)\ze\_s*\%([;{]\|=>\)"
+
+syn keyword	csAccess	base
+syn match	csAccess	"\<this\>"
+
+" Extension method parameter modifier
+syn match	csModifier	"\<this\ze\_s\+@\=\h"
+
+syn keyword	csUnspecifiedStatement	as in is nameof operator out params ref sizeof stackalloc using
+syn keyword	csUnsupportedStatement	value
 syn keyword	csUnspecifiedKeyword	explicit implicit
 
-" Contextual Keywords
-syn match	csContextualStatement	/\<yield[[:space:]\n]\+\%(return\|break\)/me=s+5
-syn match	csContextualStatement	/\<partial[[:space:]\n]\+\%(class\|struct\|interface\)/me=s+7
-syn match	csContextualStatement	/\<\%(get\|set\)\%(;\|[[:space:]\n]*{\)/me=s+3
-syn match	csContextualStatement	/\<\%(get\|set\)\s*=>/me=s+3
-syn match	csContextualStatement	/\<where\>[^:]\+:/me=s+5
-
 " Operators
-syn keyword	csTypeOf	typeof contained
-syn region	csTypeOfStatement	start="typeof(" end=")" contains=csType, csTypeOf
+syn keyword	csTypeOf	typeof nextgroup=csTypeOfOperand,csTypeOfError skipwhite skipempty
+syn region	csTypeOfOperand	matchgroup=csParens start="(" end=")" contained contains=csType
+syn match       csTypeOfError               "[^([:space:]]" contained
+syn match	csKeywordOperator	"\<\%(checked\|unchecked\)\ze\_s*("
 
 " Punctuation
-syn match	csBraces	"[{}\[\]]" display
+syn match	csBraces	"[{}[\]]" display
 syn match	csParens	"[()]" display
 syn match	csOpSymbols	"+\{1,2}" display
 syn match	csOpSymbols	"-\{1,2}" display
@@ -64,128 +102,173 @@
 syn match	csLogicSymbols	"||" display
 syn match	csLogicSymbols	"?" display
 syn match	csLogicSymbols	":" display
+syn match	csNamespaceAliasQualifier	"::" display
 
 " Generics
-syn region	csGeneric	matchgroup=csGenericBraces start="<" end=">" oneline contains=csType,csGeneric,csUserType,csUserIdentifier,csUserInterface,csUserMethod
+syn region	csGeneric	matchgroup=csGenericBraces start="<" end=">" oneline contains=csType,csGeneric,@csNamespaceAlias,csUserType,csUserIdentifier,csUserInterface,csUserMethod
 
 " Comments
 "
 " PROVIDES: @csCommentHook
 syn keyword	csTodo	contained TODO FIXME XXX NOTE HACK TBD
-syn region	csComment	start="/\*"  end="\*/" contains=@csCommentHook,csTodo,@Spell
-syn match	csComment	"//.*$" contains=@csCommentHook,csTodo,@Spell
+syn region	csBlockComment	start="/\*"  end="\*/" contains=@csCommentHook,csTodo,@Spell
+syn match	csLineComment	"//.*$" contains=@csCommentHook,csTodo,@Spell
+syn cluster	csComment	contains=csLineComment,csBlockComment
 
-" xml markup inside '///' comments
-syn cluster	xmlRegionHook	add=csXmlCommentLeader
-syn cluster	xmlCdataHook	add=csXmlCommentLeader
-syn cluster	xmlStartTagHook	add=csXmlCommentLeader
-syn keyword	csXmlTag	contained Libraries Packages Types Excluded ExcludedTypeName ExcludedLibraryName
-syn keyword	csXmlTag	contained ExcludedBucketName TypeExcluded Type TypeKind TypeSignature AssemblyInfo
-syn keyword	csXmlTag	contained AssemblyName AssemblyPublicKey AssemblyVersion AssemblyCulture Base
-syn keyword	csXmlTag	contained BaseTypeName Interfaces Interface InterfaceName Attributes Attribute
-syn keyword	csXmlTag	contained AttributeName Members Member MemberSignature MemberType MemberValue
-syn keyword	csXmlTag	contained ReturnValue ReturnType Parameters Parameter MemberOfPackage
-syn keyword	csXmlTag	contained ThreadingSafetyStatement Docs devdoc example overload remarks returns summary
-syn keyword	csXmlTag	contained threadsafe value internalonly nodoc exception param permission platnote
-syn keyword	csXmlTag	contained seealso b c i pre sub sup block code note paramref see subscript superscript
-syn keyword	csXmlTag	contained list listheader item term description altcompliant altmember
+syn region	csSummary	start="^\s*/// <summary" end="^\%\(\s*///\)\@!" transparent fold keepend
 
-syn cluster xmlTagHook add=csXmlTag
+" xml markup inside '///' and /**...*/ comments
+syn cluster	xmlRegionHook	add=csXmlLineCommentLeader,csXmlBlockCommentMiddle
+syn cluster	xmlCdataHook	add=csXmlLineCommentLeader,csXmlBlockCommentMiddle
+syn cluster	xmlStartTagHook	add=csXmlLineCommentLeader,csXmlBlockCommentMiddle
+syn cluster	xmlTagHook	add=csXmlTag
+syn cluster	xmlAttribHook	add=csXmlAttrib
 
-syn match	csXmlCommentLeader	"///" contained
-syn match	csXmlComment	"///.*$" contains=csXmlCommentLeader,@csXml,@Spell keepend
+" https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/xmldoc/recommended-tags
+syn keyword	csXmlTag	contained summary remarks
+syn keyword	csXmlTag	contained returns param paramref exception value
+syn keyword	csXmlTag	contained para list c code example
+syn keyword	csXmlTag	contained inheritdoc include
+syn keyword	csXmlTag	contained see seealso
+syn keyword	csXmlTag	contained typeparam typeparamref
+syn keyword	csXmlTag	contained b i u br a
+syn keyword	csXmlAttrib	contained cref href
+
+syn match	csXmlLineCommentLeader	"///" contained
+syn match	csXmlLineComment	"///.*$" contains=csXmlLineCommentLeader,@csXml,@Spell keepend
+syn match	csXmlBlockCommentMiddle	"^\s*\zs\*" contained
+syn region	csXmlBlockComment	start="/\*\*" end="\*/" contains=@csXml,@Spell,csXmlBlockCommentMiddle keepend
 syn include	@csXml syntax/xml.vim
 hi def link	xmlRegion Comment
 
 " Since syntax/xml.vim contains `syn spell toplevel`, we need to set it back to `default` here.
 syn spell default
 
-" [1] 9.5 Pre-processing directives
-syn region	csPreCondit	start="^\s*#\s*\%(define\|undef\|if\|elif\|else\|endif\|line\|error\|warning\|pragma\)\>" skip="\\$" end="$" contains=csComment keepend
-syn region	csRegion	matchgroup=csPreCondit start="^\s*#\s*region.*$" end="^\s*#\s*endregion" transparent fold contains=TOP
-syn region	csSummary	start="^\s*/// <summary" end="^\%\(\s*///\)\@!" transparent fold keepend
+" Pre-processing directives
+syn region	csPreProcDeclaration	start="^\s*\zs#\s*\%(define\|undef\)\>" end="$" contains=csLineComment keepend
+syn region	csPreProcConditional	start="^\s*\zs#\s*\%(if\|elif\)\>" end="$" contains=csLineComment keepend
+syn region	csPreProcConditional	start="^\s*\zs#\s*\%(else\|endif\)\>" end="$" contains=csLineComment keepend
+syn region	csPreProcLine	start="^\s*\zs#\s*line\>" end="$" contains=csLineComment keepend
+syn region	csPreProcDiagnostic	start="^\s*\zs#\s*\%(error\|warning\)\>" end="$"
+syn region	csPreProcConditionalSection	matchgroup=csPreProcRegion start="^\s*#\s*region\>.*" end="^\s*#\s*endregion\>.*" transparent fold contains=TOP
+syn region	csPreProcPragma	start="^\s*\zs#\s*pragma\>" end="$" contains=csLineComment keepend
+syn region	csPreProcNullable	start="^\s*\zs#\s*nullable\>" end="$" contains=csLineComment keepend
 
+if expand('%:e') == 'csx' || getline('1') =~ '^#!.*\<dotnet-script\>'
+  syn region	csPreProcInclude	start="^\s*\zs#\s*\%(load\|r\)\>" end="$" contains=csLineComment keepend
+  syn match	csShebang	"\%^#!.*" display
+endif
 
-syn region	csClassType	start="@\@1<!\<class\>"hs=s+6 end="[:\n{]"me=e-1 contains=csClass
+syn cluster	csPreProcessor	contains=csPreProc.*
+
+syn region	csClassType	start="\<class\>"hs=s+6 end=">" end="[:{]"me=e-1 contains=csClass
 " csUserType may be defined by user scripts/plugins - it should be contained in csNewType
-syn region	csNewType	start="@\@1<!\<new\>"hs=s+4 end="[;\n{(<\[]"me=e-1 contains=csNew,csUserType
+syn region	csNewType	start="\<new\>"hs=s+4 end="[;\n{(<\[]"me=e-1 contains=csNew,@csNamespaceAlias,csUserType
 syn region	csIsType	start=" is "hs=s+4 end="[A-Za-z0-9]\+" oneline contains=csIsAs
 syn region	csIsType	start=" as "hs=s+4 end="[A-Za-z0-9]\+" oneline contains=csIsAs
 syn keyword	csNew	new contained
 syn keyword	csClass	class contained
 syn keyword	csIsAs	is as
 
+syn keyword	csBoolean	false true
+syn keyword	csNull	null
+
 " Strings and constants
 syn match	csSpecialError	"\\." contained
 syn match	csSpecialCharError	"[^']" contained
-" [1] 9.4.4.4 Character literals
-syn match	csSpecialChar	+\\["\\'0abfnrtvx]+ contained display
-syn match	csUnicodeNumber	+\\x\x\{2,4}+ contained contains=csUnicodeSpecifier display
+" Character literals
+syn match	csSpecialChar	+\\["\\'0abfnrtv]+ contained display
+syn match	csUnicodeNumber	+\\x\x\{1,4}+ contained contains=csUnicodeSpecifier display
 syn match	csUnicodeNumber	+\\u\x\{4}+ contained contains=csUnicodeSpecifier display
-syn match	csUnicodeNumber	+\\U\x\{8}+ contained contains=csUnicodeSpecifier display
-syn match	csUnicodeSpecifier	+\\[uU]+ contained display
+syn match	csUnicodeNumber	+\\U00\x\{6}+ contained contains=csUnicodeSpecifier display
+syn match	csUnicodeSpecifier	+\\[uUx]+ contained display
 
 syn region	csString	matchgroup=csQuote start=+"+  end=+"+ end=+$+ extend contains=csSpecialChar,csSpecialError,csUnicodeNumber,@Spell
 syn match	csCharacter	"'[^']*'" contains=csSpecialChar,csSpecialCharError,csUnicodeNumber display
 syn match	csCharacter	"'\\''" contains=csSpecialChar display
 syn match	csCharacter	"'[^\\]'" display
-syn match	csNumber	"\<0[0-7]*[lL]\=\>" display
-syn match	csNumber	"\<0[xX][[:xdigit:]_]\+[lL]\=\>" display
-syn match	csNumber	"\<0[bB][01_]\+[lL]\=\>" display
-syn match	csNumber	"\<[[:digit:]_]\+[lL]\=\>" display
-syn match	csNumber	"\<[[:digit:]_]\+\.[[:digit:]_]*\%\([eE][-+]\=[[:digit:]_]\+\)\=[fFdDmM]\=" display
-syn match	csNumber	"\.[[:digit:]_]\+\%\([eE][-+]\=[[:digit:]_]\+\)\=[fFdDmM]\=" display
-syn match	csNumber	"\<[[:digit:]_]\+[eE][-+]\=[[:digit:]_]\+[fFdDmM]\=\>" display
-syn match	csNumber	"\<[[:digit:]_]\+\%\([eE][-+]\=[[:digit:]_]\+\)\=[fFdDmM]\>" display
+
+" Numbers
+syn case	ignore
+syn match	csInteger	"\<0b[01_]*[01]\%([lu]\|lu\|ul\)\=\>" display
+syn match	csInteger	"\<\d\+\%(_\+\d\+\)*\%([lu]\|lu\|ul\)\=\>" display
+syn match	csInteger	"\<0x[[:xdigit:]_]*\x\%([lu]\|lu\|ul\)\=\>" display
+syn match	csReal	"\<\d\+\%(_\+\d\+\)*\.\d\+\%(_\+\d\+\)*\%\(e[-+]\=\d\+\%(_\+\d\+\)*\)\=[fdm]\=" display
+syn match	csReal	"\.\d\+\%(_\+\d\+\)*\%(e[-+]\=\d\+\%(_\+\d\+\)*\)\=[fdm]\=\>" display
+syn match	csReal	"\<\d\+\%(_\+\d\+\)*e[-+]\=\d\+\%(_\+\d\+\)*[fdm]\=\>" display
+syn match	csReal	"\<\d\+\%(_\+\d\+\)*[fdm]\>" display
+syn case	match
+syn cluster     csNumber	contains=csInteger,csReal
 
 syn region	csInterpolatedString	matchgroup=csQuote start=+\$"+ end=+"+ extend contains=csInterpolation,csEscapedInterpolation,csSpecialChar,csSpecialError,csUnicodeNumber,@Spell
 
 syn region	csInterpolation	matchgroup=csInterpolationDelimiter start=+{+ end=+}+ keepend contained contains=@csAll,csBraced,csBracketed,csInterpolationAlign,csInterpolationFormat
 syn match	csEscapedInterpolation	"{{" transparent contains=NONE display
 syn match	csEscapedInterpolation	"}}" transparent contains=NONE display
-syn region	csInterpolationAlign	matchgroup=csInterpolationAlignDel start=+,+ end=+}+ end=+:+me=e-1 contained contains=csNumber,csConstant,csCharacter,csParens,csOpSymbols,csString,csBracketed display
+syn region	csInterpolationAlign	matchgroup=csInterpolationAlignDel start=+,+ end=+}+ end=+:+me=e-1 contained contains=@csNumber,csBoolean,csConstant,csCharacter,csParens,csOpSymbols,csString,csBracketed display
 syn match	csInterpolationFormat	+:[^}]\+}+ contained contains=csInterpolationFormatDel display
 syn match	csInterpolationAlignDel	+,+ contained display
 syn match	csInterpolationFormatDel	+:+ contained display
 
 syn region	csVerbatimString	matchgroup=csQuote start=+@"+ end=+"+ skip=+""+ extend contains=csVerbatimQuote,@Spell
 syn match	csVerbatimQuote	+""+ contained
-syn match	csQuoteError	+@$"+he=s+2,me=s+2
 
-syn region	csInterVerbString	matchgroup=csQuote start=+\$@"+ end=+"+ skip=+""+ extend contains=csInterpolation,csEscapedInterpolation,csSpecialChar,csSpecialError,csUnicodeNumber,csVerbatimQuote,@Spell
+syn region	csInterVerbString	matchgroup=csQuote start=+$@"+ start=+@$"+ end=+"+ skip=+""+ extend contains=csInterpolation,csEscapedInterpolation,csSpecialChar,csSpecialError,csUnicodeNumber,csVerbatimQuote,@Spell
+
+syn cluster	csString	contains=csString,csInterpolatedString,csVerbatimString,csInterVerbString
+
+syn cluster	csLiteral	contains=csBoolean,@csNumber,csCharacter,@csString,csNull
 
 syn region	csBracketed	matchgroup=csParens start=+(+ end=+)+ extend contained transparent contains=@csAll,csBraced,csBracketed
 syn region	csBraced	matchgroup=csParens start=+{+ end=+}+ extend contained transparent contains=@csAll,csBraced,csBracketed
 
-syn cluster	csAll	contains=csCharacter,csClassType,csComment,csContextualStatement,csEndColon,csIsType,csLabel,csLogicSymbols,csNewType,csConstant,csNumber,csOpSymbols,csOperatorError,csParens,csPreCondit,csRegion,csString,csSummary,csType,csUnicodeNumber,csUnicodeSpecifier,csInterpolatedString,csVerbatimString,csInterVerbString,csUserType,csUserIdentifier,csUserInterface,csUserMethod
+syn cluster	csAll	contains=@csLiteral,csClassType,@csComment,csEndColon,csIsType,csLabel,csLogicSymbols,csNewType,csOpSymbols,csParens,@csPreProcessor,csSummary,@csNamespaceAlias,csType,csUnicodeNumber,csUserType,csUserIdentifier,csUserInterface,csUserMethod
+
+" Keyword identifiers
+syn match csIdentifier "@\h\w*"
 
 " The default highlighting.
-hi def link	csType	Type
-hi def link	csClassType	Type
-hi def link	csIsType	Type
-hi def link	csStorage	Structure
-hi def link	csClass	Structure
-hi def link	csRepeat	Repeat
-hi def link	csConditional	Conditional
-hi def link	csLabel	Label
-hi def link	csModifier	StorageClass
-hi def link	csConstant	Constant
-hi def link	csException	Exception
-hi def link	csTypeOf	Keyword
-hi def link	csTypeOfStatement	Typedef
 hi def link	csUnspecifiedStatement	Statement
 hi def link	csUnsupportedStatement	Statement
 hi def link	csUnspecifiedKeyword	Keyword
+
+hi def link	csGlobalNamespaceAlias	Include
+
+hi def link	csType	Type
+hi def link	csClassType	Type
+hi def link	csIsType	Type
+
+hi def link	csStorage	Structure
+hi def link	csClass	Structure
 hi def link	csNew	Statement
-hi def link	csLinq	Statement
 hi def link	csIsAs 	Keyword
-hi def link	csAsync	Keyword
-hi def link	csContextualStatement	Statement
-hi def link	csOperatorError	Error
+hi def link	csAccessor	Keyword
+hi def link	csAccess	Keyword
+
+hi def link	csLinq	Statement
+
+hi def link	csStatement	Statement
+hi def link	csRepeat	Repeat
+hi def link	csConditional	Conditional
+hi def link	csLabel	Label
+hi def link	csException	Exception
+
+hi def link	csModifier	StorageClass
+hi def link	csAccessModifier	csModifier
+hi def link	csAsyncModifier	csModifier
+hi def link	csManagedModifier	csModifier
+hi def link	csUsingModifier	csModifier
 
 hi def link	csTodo	Todo
 hi def link	csComment	Comment
+hi def link	csLineComment	csComment
+hi def link	csBlockComment	csComment
 
+hi def link	csKeywordOperator	Keyword
+hi def link	csAsyncOperator	csKeywordOperator
+hi def link	csTypeOf	csKeywordOperator
+hi def link	csTypeOfOperand	Typedef
+hi def link	csTypeOfError	Error
 hi def link	csOpSymbols	Operator
 hi def link	csLogicSymbols	Operator
 
@@ -193,15 +276,29 @@
 hi def link	csSpecialCharError	Error
 hi def link	csString	String
 hi def link	csQuote	String
-hi def link	csQuoteError	Error
 hi def link	csInterpolatedString	String
 hi def link	csVerbatimString	String
 hi def link	csInterVerbString	String
 hi def link	csVerbatimQuote	SpecialChar
-hi def link	csPreCondit	PreCondit
+
+hi def link     csPreProc	PreProc
+hi def link	csPreProcDeclaration	Define
+hi def link	csPreProcConditional	PreCondit
+hi def link	csPreProcLine	csPreProc
+hi def link	csPreProcDiagnostic	csPreProc
+hi def link	csPreProcRegion	csPreProc
+hi def link	csPreProcPragma	csPreProc
+hi def link	csPreProcNullable	csPreProc
+hi def link	csPreProcInclude	csPreProc
+hi def link	csShebang	csPreProc
+
+hi def link	csConstant	Constant
+hi def link	csNull	Constant
+hi def link	csBoolean	Boolean
 hi def link	csCharacter	Character
 hi def link	csSpecialChar	SpecialChar
-hi def link	csNumber	Number
+hi def link	csInteger	Number
+hi def link	csReal	Float
 hi def link	csUnicodeNumber	SpecialChar
 hi def link	csUnicodeSpecifier	SpecialChar
 hi def link	csInterpolationDelimiter	Delimiter
@@ -212,9 +309,12 @@
 hi def link	csGenericBraces	csBraces
 
 " xml markup
-hi def link	csXmlCommentLeader	Comment
-hi def link	csXmlComment	Comment
+hi def link	csXmlLineCommentLeader	Comment
+hi def link	csXmlLineComment	Comment
+hi def link	csXmlBlockComment	Comment
+hi def link	csXmlBlockCommentMiddle	csXmlBlockComment
 hi def link	csXmlTag	Statement
+hi def link	csXmlAttrib	Statement
 
 let b:current_syntax = 'cs'
 
diff --git a/runtime/syntax/java.vim b/runtime/syntax/java.vim
index c9bb5dc..00d6071 100644
--- a/runtime/syntax/java.vim
+++ b/runtime/syntax/java.vim
@@ -2,7 +2,7 @@
 " Language:	Java
 " Maintainer:	Claudio Fleiner <claudio@fleiner.com>
 " URL:          https://github.com/fleiner/vim/blob/master/runtime/syntax/java.vim
-" Last Change:	2018 July 26
+" Last Change:	2022 Jun 08
 
 " Please check :help java.vim for comments on some of the options available.
 
@@ -23,8 +23,6 @@
 syn match javaError "[\\@`]"
 syn match javaError "<<<\|\.\.\|=>\|||=\|&&=\|\*\/"
 
-syn match javaOK "\.\.\."
-
 " use separate name so that it can be deleted in javacc.vim
 syn match   javaError2 "#\|=<"
 hi def link javaError2 javaError
@@ -59,8 +57,12 @@
 syn match   javaVarArg		"\.\.\."
 syn keyword javaScopeDecl	public protected private abstract
 
+function s:isModuleInfoDeclarationCurrentBuffer() abort
+    return fnamemodify(bufname("%"), ":t") =~ '^module-info\%(\.class\>\)\@!'
+endfunction
+
 " Java Modules(Since Java 9, for "module-info.java" file)
-if fnamemodify(bufname("%"), ":t") == "module-info.java"
+if s:isModuleInfoDeclarationCurrentBuffer()
     syn keyword javaModuleStorageClass	module transitive
     syn keyword javaModuleStmt		open requires exports opens uses provides
     syn keyword javaModuleExternal	to with
@@ -72,20 +74,42 @@
 endif
 if exists("java_highlight_all")  || exists("java_highlight_java")  || exists("java_highlight_java_lang")
   " java.lang.*
-  syn match javaLangClass "\<System\>"
-  syn keyword javaR_JavaLang NegativeArraySizeException ArrayStoreException IllegalStateException RuntimeException IndexOutOfBoundsException UnsupportedOperationException ArrayIndexOutOfBoundsException ArithmeticException ClassCastException EnumConstantNotPresentException StringIndexOutOfBoundsException IllegalArgumentException IllegalMonitorStateException IllegalThreadStateException NumberFormatException NullPointerException TypeNotPresentException SecurityException
+  "
+  " The keywords of javaR_JavaLang, javaC_JavaLang, javaE_JavaLang,
+  " and javaX_JavaLang are sub-grouped according to the Java version
+  " of their introduction, and sub-group keywords (that is, class
+  " names) are arranged in alphabetical order, so that future newer
+  " keywords can be pre-sorted and appended without disturbing
+  " the current keyword placement. The below _match_es follow suit.
+
+  syn keyword javaR_JavaLang ArithmeticException ArrayIndexOutOfBoundsException ArrayStoreException ClassCastException IllegalArgumentException IllegalMonitorStateException IllegalThreadStateException IndexOutOfBoundsException NegativeArraySizeException NullPointerException NumberFormatException RuntimeException SecurityException StringIndexOutOfBoundsException IllegalStateException UnsupportedOperationException EnumConstantNotPresentException TypeNotPresentException IllegalCallerException LayerInstantiationException
   syn cluster javaTop add=javaR_JavaLang
   syn cluster javaClasses add=javaR_JavaLang
   hi def link javaR_JavaLang javaR_Java
-  syn keyword javaC_JavaLang Process RuntimePermission StringKeySet CharacterData01 Class ThreadLocal ThreadLocalMap CharacterData0E Package Character StringCoding Long ProcessImpl ProcessEnvironment Short AssertionStatusDirectives 1PackageInfoProxy UnicodeBlock InheritableThreadLocal AbstractStringBuilder StringEnvironment ClassLoader ConditionalSpecialCasing CharacterDataPrivateUse StringBuffer StringDecoder Entry StringEntry WrappedHook StringBuilder StrictMath State ThreadGroup Runtime CharacterData02 MethodArray Object CharacterDataUndefined Integer Gate Boolean Enum Variable Subset StringEncoder Void Terminator CharsetSD IntegerCache CharacterCache Byte CharsetSE Thread SystemClassLoaderAction CharacterDataLatin1 StringValues StackTraceElement Shutdown ShortCache String ConverterSD ByteCache Lock EnclosingMethodInfo Math Float Value Double SecurityManager LongCache ProcessBuilder StringEntrySet Compiler Number UNIXProcess ConverterSE ExternalData CaseInsensitiveComparator CharacterData00 NativeLibrary
+  " Member enumerations:
+  syn match   javaC_JavaLang "\%(\<Thread\.\)\@<=\<State\>"
+  syn match   javaC_JavaLang "\%(\<Character\.\)\@<=\<UnicodeScript\>"
+  syn match   javaC_JavaLang "\%(\<ProcessBuilder\.Redirect\.\)\@<=\<Type\>"
+  syn match   javaC_JavaLang "\%(\<StackWalker\.\)\@<=\<Option\>"
+  syn match   javaC_JavaLang "\%(\<System\.Logger\.\)\@<=\<Level\>"
+  " Member classes:
+  syn match   javaC_JavaLang "\%(\<Character\.\)\@<=\<Subset\>"
+  syn match   javaC_JavaLang "\%(\<Character\.\)\@<=\<UnicodeBlock\>"
+  syn match   javaC_JavaLang "\%(\<ProcessBuilder\.\)\@<=\<Redirect\>"
+  syn match   javaC_JavaLang "\%(\<ModuleLayer\.\)\@<=\<Controller\>"
+  syn match   javaC_JavaLang "\%(\<Runtime\.\)\@<=\<Version\>"
+  syn match   javaC_JavaLang "\%(\<System\.\)\@<=\<LoggerFinder\>"
+  syn match   javaC_JavaLang "\%(\<Enum\.\)\@<=\<EnumDesc\>"
+  syn keyword javaC_JavaLang Boolean Character Class ClassLoader Compiler Double Float Integer Long Math Number Object Process Runtime SecurityManager String StringBuffer Thread ThreadGroup Byte Short Void InheritableThreadLocal Package RuntimePermission ThreadLocal StrictMath StackTraceElement Enum ProcessBuilder StringBuilder ClassValue Module ModuleLayer StackWalker Record
+  syn match   javaC_JavaLang "\<System\>"	" See javaDebug.
   syn cluster javaTop add=javaC_JavaLang
   syn cluster javaClasses add=javaC_JavaLang
   hi def link javaC_JavaLang javaC_Java
-  syn keyword javaE_JavaLang IncompatibleClassChangeError InternalError UnknownError ClassCircularityError AssertionError ThreadDeath IllegalAccessError NoClassDefFoundError ClassFormatError UnsupportedClassVersionError NoSuchFieldError VerifyError ExceptionInInitializerError InstantiationError LinkageError NoSuchMethodError Error UnsatisfiedLinkError StackOverflowError AbstractMethodError VirtualMachineError OutOfMemoryError
+  syn keyword javaE_JavaLang AbstractMethodError ClassCircularityError ClassFormatError Error IllegalAccessError IncompatibleClassChangeError InstantiationError InternalError LinkageError NoClassDefFoundError NoSuchFieldError NoSuchMethodError OutOfMemoryError StackOverflowError ThreadDeath UnknownError UnsatisfiedLinkError VerifyError VirtualMachineError ExceptionInInitializerError UnsupportedClassVersionError AssertionError BootstrapMethodError
   syn cluster javaTop add=javaE_JavaLang
   syn cluster javaClasses add=javaE_JavaLang
   hi def link javaE_JavaLang javaE_Java
-  syn keyword javaX_JavaLang CloneNotSupportedException Exception NoSuchMethodException IllegalAccessException NoSuchFieldException Throwable InterruptedException ClassNotFoundException InstantiationException
+  syn keyword javaX_JavaLang ClassNotFoundException CloneNotSupportedException Exception IllegalAccessException InstantiationException InterruptedException NoSuchMethodException Throwable NoSuchFieldException ReflectiveOperationException
   syn cluster javaTop add=javaX_JavaLang
   syn cluster javaClasses add=javaX_JavaLang
   hi def link javaX_JavaLang javaX_Java
@@ -118,7 +142,7 @@
   endif
 endif
 
-syn region  javaLabelRegion	transparent matchgroup=javaLabel start="\<case\>" matchgroup=NONE end=":" contains=javaNumber,javaCharacter,javaString
+syn region  javaLabelRegion	transparent matchgroup=javaLabel start="\<case\>" end="->" matchgroup=NONE end=":" contains=javaNumber,javaCharacter,javaString
 syn match   javaUserLabel	"^\s*[_$a-zA-Z][_$a-zA-Z0-9_]*\s*:"he=e-1 contains=javaLabel
 syn keyword javaLabel		default
 
@@ -126,7 +150,7 @@
 " annoying.  Was: if !exists("java_allow_cpp_keywords")
 
 " The following cluster contains all java groups except the contained ones
-syn cluster javaTop add=javaExternal,javaError,javaError,javaBranch,javaLabelRegion,javaLabel,javaConditional,javaRepeat,javaBoolean,javaConstant,javaTypedef,javaOperator,javaType,javaType,javaStatement,javaStorageClass,javaAssert,javaExceptions,javaMethodDecl,javaClassDecl,javaClassDecl,javaClassDecl,javaScopeDecl,javaError,javaError2,javaUserLabel,javaLangObject,javaAnnotation,javaVarArg
+syn cluster javaTop add=javaExternal,javaError,javaBranch,javaLabelRegion,javaLabel,javaConditional,javaRepeat,javaBoolean,javaConstant,javaTypedef,javaOperator,javaType,javaStatement,javaStorageClass,javaAssert,javaExceptions,javaMethodDecl,javaClassDecl,javaScopeDecl,javaError2,javaUserLabel,javaLangObject,javaAnnotation,javaVarArg
 
 
 " Comments
@@ -153,7 +177,7 @@
 if !exists("java_ignore_javadoc") && main_syntax != 'jsp'
   syntax case ignore
   " syntax coloring for javadoc comments (HTML)
-  syntax include @javaHtml <sfile>:p:h/html.vim
+  syntax include @javaHtml syntax/html.vim
   unlet b:current_syntax
   " HTML enables spell checking for all text that is not in a syntax item. This
   " is wrong for Java (all identifiers would be spell-checked), so it's undone
@@ -336,7 +360,7 @@
 hi def link htmlCommentPart		Special
 hi def link javaSpaceError		Error
 
-if fnamemodify(bufname("%"), ":t") == "module-info.java"
+if s:isModuleInfoDeclarationCurrentBuffer()
     hi def link javaModuleStorageClass	StorageClass
     hi def link javaModuleStmt		Statement
     hi def link javaModuleExternal	Include
@@ -348,6 +372,7 @@
   unlet main_syntax
 endif
 
+delfunction! s:isModuleInfoDeclarationCurrentBuffer
 let b:spell_options="contained"
 let &cpo = s:cpo_save
 unlet s:cpo_save
diff --git a/runtime/syntax/javascript.vim b/runtime/syntax/javascript.vim
index 1ab1c2d..e513137 100644
--- a/runtime/syntax/javascript.vim
+++ b/runtime/syntax/javascript.vim
@@ -7,7 +7,7 @@
 "		(ss) repaired several quoting and grouping glitches
 "		(ss) fixed regex parsing issue with multiple qualifiers [gi]
 "		(ss) additional factoring of keywords, globals, and members
-" Last Change:	2021 Mar 30
+" Last Change:	2022 Jun 09
 " 		2013 Jun 12: adjusted javaScriptRegexpString (Kevin Locke)
 " 		2018 Apr 14: adjusted javaScriptRegexpString (LongJohnCoder)
 
@@ -39,9 +39,16 @@
 
 syn region  javaScriptEmbed	       start=+${+  end=+}+	contains=@javaScriptEmbededExpr
 
+" number handling by Christopher Leonard chris.j.leonard@gmx.com
 syn match   javaScriptSpecialCharacter "'\\.'"
-syn match   javaScriptNumber	       "-\=\<\d\+L\=\>\|0[xX][0-9a-fA-F]\+\>"
-syn match   javaScriptNumber	       "-\=\<\d\+\%(_\d\+\)*\>"
+syn match   javaScriptNumber           "\<0[bB][0-1]\+\(_[0-1]\+\)*\>"
+syn match   javaScriptNumber           "\<0[oO][0-7]\+\(_[0-7]\+\)*\>"
+syn match   javaScriptNumber           "\<0\([0-7]\+\(_[0-7]\+\)*\)\?\>"
+syn match   javaScriptNumber           "\<0[xX][0-9a-fA-F]\+\(_[0-9a-fA-F]\+\)*\>"
+syn match   javaScriptNumber           "\<\d\+\(_\d\+\)*[eE][+-]\?\d\+\>"
+syn match   javaScriptNumber           "\<[1-9]\d*\(_\d\+\)*\(\.\(\d\+\(_\d\+\)*\([eE][+-]\?\d\+\)\?\)\?\)\?\>"
+syn match   javaScriptNumber           "\<\(\d\+\(_\d\+\)*\)\?\.\d\+\(_\d\+\)*\([eE][+-]\?\d\+\)\?\>"
+syn match   javaScriptNumber           "\<\d\+\(_\d\+\)*\.\(\d\+\(_\d\+\)*\([eE][+-]\?\d\+\)\?\)\?\>"
 syn region  javaScriptRegexpString     start=+[,(=+]\s*/[^/*]+ms=e-1,me=e-1 skip=+\\\\\|\\/+ end=+/[gimuys]\{0,2\}\s*$+ end=+/[gimuys]\{0,2\}\s*[+;.,)\]}]+me=e-1 end=+/[gimuys]\{0,2\}\s\+\/+me=e-1 contains=@htmlPreproc,javaScriptComment oneline
 
 syn keyword javaScriptConditional	if else switch
diff --git a/runtime/syntax/m4.vim b/runtime/syntax/m4.vim
index 6f229ea..366f658 100644
--- a/runtime/syntax/m4.vim
+++ b/runtime/syntax/m4.vim
@@ -21,6 +21,7 @@
 syn match  m4Variable contained "\$\d\+"
 syn match  m4Special  contained "$[@*#]"
 syn match  m4Comment  "\<\(m4_\)\=dnl\>.*" contains=SpellErrors
+syn match  m4Comment  "#.*" contains=SpellErrors
 syn match  m4Constants "\<\(m4_\)\=__file__"
 syn match  m4Constants "\<\(m4_\)\=__line__"
 syn keyword m4Constants divnum sysval m4_divnum m4_sysval
@@ -32,7 +33,7 @@
 syn keyword m4Statement divert undivert
 syn region m4Command  matchgroup=m4Type      start="\<\(m4_\)\=\(undefine\|popdef\)("he=e-1 end=")" contains=@m4Top
 syn region m4Function matchgroup=m4Type      start="\<[_A-Z][_A-Z0-9]*("he=e-1 end=")" contains=@m4Top
-syn region m4String   start="`" end="'" contained contains=@m4Top,@m4StringContents,SpellErrors
+syn region m4String   start="`" end="'" contains=SpellErrors
 syn cluster m4Top     contains=m4Comment,m4Constants,m4Special,m4Variable,m4String,m4Paren,m4Command,m4Statement,m4Function
 
 " Define the default highlighting.
diff --git a/runtime/syntax/webmacro.vim b/runtime/syntax/webmacro.vim
index fb1fff6..9597525 100644
--- a/runtime/syntax/webmacro.vim
+++ b/runtime/syntax/webmacro.vim
@@ -34,9 +34,9 @@
 
 syn region webmacroIf start="#if" start="#else" end="{"me=e-1 contains=webmacroVariable,webmacroNumber,webmacroString,webmacroBoolean,webmacroList nextgroup=webmacroBraces
 syn region webmacroForeach start="#foreach" end="{"me=e-1 contains=webmacroVariable,webmacroNumber,webmacroString,webmacroBoolean,webmacroList nextgroup=webmacroBraces
-syn match webmacroSet "#set .*$" contains=webmacroVariable,webmacroNumber,webmacroNumber,webmacroBoolean,webmacroString,webmacroList
-syn match webmacroInclude "#include .*$" contains=webmacroVariable,webmacroNumber,webmacroNumber,webmacroBoolean,webmacroString,webmacroList
-syn match webmacroParse "#parse .*$" contains=webmacroVariable,webmacroNumber,webmacroNumber,webmacroBoolean,webmacroString,webmacroList
+syn match webmacroSet "#set .*$" contains=webmacroVariable,webmacroNumber,webmacroBoolean,webmacroString,webmacroList
+syn match webmacroInclude "#include .*$" contains=webmacroVariable,webmacroNumber,webmacroBoolean,webmacroString,webmacroList
+syn match webmacroParse "#parse .*$" contains=webmacroVariable,webmacroNumber,webmacroBoolean,webmacroString,webmacroList
 syn region webmacroUse matchgroup=PreProc start="#use .*" matchgroup=PreProc end="^-.*" contains=webmacroHash,@HtmlTop
 syn region webmacroBraces matchgroup=Structure start="{" matchgroup=Structure end="}" contained transparent
 syn match webmacroBracesError "[{}]"