Before that patch no error was given).

			{name} may be a |Dictionary| |Funcref| entry: >
				:function dict.init(arg)
<			"dict" must be an existing dictionary.  The entry
			"init" is added if it didn't exist yet.  Otherwise [!]
			is required to overwrite an existing function.  The
			result is a |Funcref| to a numbered function.  The
			function can only be used with a |Funcref| and will be
			deleted if there are no more references to it.
								*E127* *E122*
			When a function by this name already exists and [!] is
			not used an error message is given.  There is one
			exception: When sourcing a script again, a function
			that was previously defined in that script will be
			silently replaced.
			When [!] is used, an existing function is silently
			replaced.  Unless it is currently being executed, that
			is an error.
			NOTE: Use ! wisely.  If used without care it can cause
			an existing function to be replaced unexpectedly,
			which is hard to debug.

			For the {arguments} see |function-argument|.

					*:func-range* *a:firstline* *a:lastline*
			When the [range] argument is added, the function is
			expected to take care of a range itself.  The range is
			passed as "a:firstline" and "a:lastline".  If [range]
			is excluded, ":{range}call" will call the function for
			each line in the range, with the cursor on the start
			of each line.  See |function-range-example|.
			The cursor is still moved to the first line of the
			range, as is the case with all Ex commands.
								*:func-abort*
			When the [abort] argument is added, the function will
			abort as soon as an error is detected.
								*:func-dict*
			When the [dict] argument is added, the function must
			be invoked through an entry in a |Dictionary|.  The
			local variable "self" will then be set to the
			dictionary.  See |Dictionary-function|.
						*:func-closure* *E932*
			When the [closure] argument is added, the function
			can access variables and arguments from the outer
			scope.  This is usually called a closure.  In this
			example Bar() uses "x" from the scope of Foo().  It
			remains referenced even after Foo() returns: >
				:function! Foo()
				:  let x = 0
				:  function! Bar() closure
				:    let x += 1
				:    return x
				:  endfunction
				:  return funcref('Bar')
				:endfunction

				:let F = Foo()
				:echo F()
<				1 >
				:echo F()
<				2 >
				:echo F()
<				3

						*function-search-undo*
			The last used search pattern and the redo command "."
			will not be changed by the function.  This also
			implies that the effect of |:nohlsearch| is undone
			when the function returns.

				*:endf* *:endfunction* *E126* *E193* *W22*
:endf[unction] [argument]
			The end of a function definition.  Best is to put it
			on a line by its own, without [argument].

			[argument] can be:
				| command	command to execute next
				\n command	command to execute next
				" comment	always ignored
				anything else	ignored, warning given when
						'verbose' is non-zero
			The support for a following command was added in Vim
			8.0.0654, before that any argument was silently
			ignored.

			To be able to define a function inside an `:execute`
			command, use line breaks instead of |:bar|: >
				:exe "func Foo()\necho 'foo'\nendfunc"
<
				*:delf* *:delfunction* *E131* *E933*
:delf[unction][!] {name}
			Delete function {name}.
			{name} can also be a |Dictionary| entry that is a
			|Funcref|: >
				:delfunc dict.init
<			This will remove the "init" entry from "dict".  The
			function is deleted if there are no more references to
			it.
			With the ! there is no error if the function does not
			exist.
							*:retu* *:return* *E133*
:retu[rn] [expr]	Return from a function.  When "[expr]" is given, it is
			evaluated and returned as the result of the function.
			If "[expr]" is not given, the number 0 is returned.
			When a function ends without an explicit ":return",
			the number 0 is returned.
			Note that there is no check for unreachable lines,