'''[TIP] [http://www.tcl.tk/cgi-bin/tct/tip/323.html%|%#323: Do Nothing
Gracefully]''', by [Colin McCormack], [Donald Porter], and [Kevin Kenny], and
implemented in Tcl version [Changes in Tcl/Tk 8.6], provides the rationale for
commands that do do nothing under certain circumnstances.



** Description **

With the advent of the `[{*}]` operator which expands an empty [list] into
nothing at all, it became clear that it would be useful in various cases if
commands that normally accept variable number of arguments at the end of the
command could handle the case of no arguments at all being passed.  The TIP
modified the following commands:

   `[file delete]`:   Accept zero pathnames.

   `[file mkdir]`:   Accept zero directorie.

   `[global]`:   Accept zero [variable] names.

   `[glob]`:   Accept zero patterns and return a `no matches` error, or when '''`-nocomplain`''' is provided, [return] a [list] of zero mathing files.

   `[lassign]`:   Accept zero variable names [http://core.tcl.tk/tcl/tktview/1671880fffffffffffff].

   `[linsert]`:   Accpet zero elements [http://core.tcl.tk/tcl/tktview/1672056fffffffffffff].

   `[lrepeat]`:   Accept both a ''number'' of `0`, and zero elements [http://core.tcl.tk/tcl/tktview/1671951fffffffffffff].

   `[my%|%my variable]`:   Accept zero variable names.

   `[namespace upvar]`:   Accept zero variable names

   `[tcl::tm::path%|%::tcl::tm::path] add`:   Accept zero paths.

   `[tcl::tm::path%|%::tcl::tm::path::remove]`:   Accept zero paths.

   `[variable]`:   Accept zero variable names [http://core.tcl.tk/tcl/tktview/1881284fffffffffffff].

   


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