current system is Windows: >vim
			if has("win32")
			  " ...
			endif
<							*feature-list*
		    List of supported pseudo-feature names:
			acl		|ACL| support.
			bsd		BSD system (not macOS, use "mac" for that).
			clipboard	|clipboard| provider is available.
			fname_case	Case in file names matters (for Darwin and MS-Windows
					this is not present).
			gui_running	Nvim has a GUI.
			hurd		GNU/Hurd system.
			iconv		Can use |iconv()| for conversion.
			linux		Linux system.
			mac		MacOS system.
			nvim		This is Nvim.
			python3		Legacy Vim |python3| interface. |has-python|
			pythonx		Legacy Vim |python_x| interface. |has-pythonx|
			sun		SunOS system.
			ttyin		input is a terminal (tty).
			ttyout		output is a terminal (tty).
			unix		Unix system.
			*vim_starting*	True during |startup|.
			win32		Windows system (32 or 64 bit).
			win64		Windows system (64 bit).
			wsl		WSL (Windows Subsystem for Linux) system.

							*has-patch*
		3.  Vim patch. For example the "patch123" feature means that
		    Vim patch 123 at the current |v:version| was included: >vim
			if v:version > 602 || v:version == 602 && has("patch148")
			  " ...
			endif

<		4.  Vim version. For example the "patch-7.4.237" feature means
		    that Nvim is Vim-compatible to version 7.4.237 or later. >vim
			if has("patch-7.4.237")
			  " ...
			endif
<

                Parameters: ~
                  • {feature} (`string`)

                Return: ~
                  (`0|1`)

has_key({dict}, {key})                                               *has_key()*
		The result is a Number, which is TRUE if |Dictionary| {dict}
		has an entry with key {key}.  FALSE otherwise. The {key}
		argument is a string.

                Parameters: ~
                  • {dict} (`table`)
                  • {key} (`string`)

                Return: ~
                  (`0|1`)

haslocaldir([{winnr} [, {tabnr}]])                               *haslocaldir()*
		The result is a Number, which is 1 when the window has set a
		local path via |:lcd| or when {winnr} is -1 and the tabpage
		has set a local path via |:tcd|, otherwise 0.

		Tabs and windows are identified by their respective numbers,
		0 means current tab or window. Missing argument implies 0.
		Thus the following are equivalent: >vim
			echo haslocaldir()
			echo haslocaldir(0)
			echo haslocaldir(0, 0)
<		With {winnr} use that window in the current tabpage.
		With {winnr} and {tabnr} use the window in that tabpage.
		{winnr} can be the window number or the |window-ID|.
		If {winnr} is -1 it is ignored, only the tab is resolved.
		Throw error if the arguments are invalid. |E5000| |E5001| |E5002|

                Parameters: ~
                  • {winnr} (`integer?`)
                  • {tabnr} (`integer?`)

                Return: ~
                  (`0|1`)

hasmapto({what} [, {mode} [, {abbr}]])                              *hasmapto()*
		The result is a Number, which is TRUE if there is a mapping
		that contains {what} in somewhere in the rhs (what it is
		mapped to) and this mapping exists in one of the modes
		indicated by {mode}.
		The arguments {what} and {mode} are strings.
		When {abbr} is there and it is |TRUE| use abbreviations
		instead of mappings.  Don't forget to specify Insert and/or
		Command-line mode.
		Both the global mappings and the mappings local to the current
		buffer are checked for a match.
		If no matching mapping is found FALSE is returned.
		The following characters are recognized in {mode}:
			n	Normal mode
			v	Visual and Select mode
			x	Visual mode
			s	Select mode
			o	Operator-pending mode
			i	Insert mode
			l	Language-Argument ("r", "f", "t", etc.)
			c	Command-line mode
		When {mode} is omitted, "nvo" is used.

		This function is useful to check if a mapping already exists
		to a function in a Vim script.  Example: >vim
			if !hasmapto('\ABCdoit')
			   map <Leader>d \ABCdoit
			endif
<		This installs the mapping to "\ABCdoit" only if there isn't
		already a mapping to "\ABCdoit".