Update runtime files

runtime/doc/vim9.txt

@@ -1,4 +1,4 @@
-*vim9.txt*	For Vim version 8.2.  Last change: 2021 Mar 30
+*vim9.txt*	For Vim version 8.2.  Last change: 2021 Apr 06
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -305,13 +305,21 @@ Variables, functions and function arguments cannot shadow previously defined
 or imported variables and functions in the same script file.
 Variables may shadow Ex commands, rename the variable if needed.
 
-Global variables and user defined functions must be prefixed with "g:", also
-at the script level. >
+Global variables must be prefixed with "g:", also at the script level. >
 	vim9script
 	var script_local = 'text'
 	g:global = 'value'
 	var Funcref = g:ThatFunction
 
+Global functions must be prefixed with "g:" when defining them, but can be
+called without "g:". >
+	vim9script
+	def g:GlobalFunc(): string
+	  return 'text'
+	enddef
+	echo GlobalFunc()
+The "g:" prefix is not needed for auto-load functions.
+
 Since `&opt = value` is now assigning a value to option "opt", ":&" cannot be
 used to repeat a `:substitute` command.
 
@@ -401,7 +409,7 @@ number of arguments and any return type.  The function can be defined later.
 
 
 Lambda using => instead of -> ~
-
+							*vim9-lambda*
 In legacy script there can be confusion between using "->" for a method call
 and for a lambda.  Also, when a "{" is found the parser needs to figure out if
 it is the start of a lambda or a dictionary, which is now more complicated
@@ -425,12 +433,19 @@ But you can use a backslash to concatenate the lines before parsing: >
 	filter(list, (k,
 		\	v)
 		\	=> v > 0)
-
+<							*inline-function*
 Additionally, a lambda can contain statements in {}: >
 	var Lambda = (arg) => {
 		g:was_called = 'yes'
 		return expression
 	    }
+This can be useful for a timer, for example: >
+	var count = 0
+ 	var timer = timer_start(500, (_) => {
+		 count += 1
+		 echom 'Handler called ' .. count
+	     }, {repeat: 3})
+
 
 The ending "}" must be at the start of a line.  It can be followed by other
 characters, e.g.: >
@@ -836,7 +851,7 @@ Patterns are used like 'magic' is set, unless explicitly overruled.
 The 'edcompatible' option value is not used.
 The 'gdefault' option value is not used.
 
-You may also find this wiki useful.  It was written by an early adoptor of
+You may also find this wiki useful.  It was written by an early adopter of
 Vim9 script: https://github.com/lacygoill/wiki/blob/master/vim/vim9.md
 
 ==============================================================================
@@ -881,14 +896,14 @@ THIS IS STILL UNDER DEVELOPMENT - ANYTHING CAN BREAK - ANYTHING CAN CHANGE
 :enddef			End of a function defined with `:def`. It should be on
 			a line by its own.
 
-You may also find this wiki useful.  It was written by an early adoptor of
+You may also find this wiki useful.  It was written by an early adopter of
 Vim9 script: https://github.com/lacygoill/wiki/blob/master/vim/vim9.md
 
 If the script the function is defined in is Vim9 script, then script-local
 variables can be accessed without the "s:" prefix.  They must be defined
 before the function is compiled.  If the script the function is defined in is
 legacy script, then script-local variables must be accessed with the "s:"
-prefix and they do not need to exist (they can be deleted any time).
+prefix if they do not exist at the time of compiling.
 
 						*:defc* *:defcompile*
 :defc[ompile]		Compile functions defined in the current script that
@@ -1073,12 +1088,15 @@ dictionary.  If there is a mix of types, the "any" type is used. >
 	['a', 'b', 'c']	list<string>
 	[1, 'x', 3]	list<any>
 
+For script-local variables in Vim9 script the type is checked, also when the
+variable was declared in a legacy function.
+
 
 Stricter type checking ~
 							*type-checking*
 In legacy Vim script, where a number was expected, a string would be
 automatically converted to a number.  This was convenient for an actual number
-such as "123", but leads to unexpected problems (but no error message) if the
+such as "123", but leads to unexpected problems (and no error message) if the
 string doesn't start with a number.  Quite often this leads to hard-to-find
 bugs.