[perl #123309] [NYI] Semicolon form of MAIN declaration

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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# <URL: https://rt.perl.org/Ticket/Display.html?id=123309 >


Quoth S06:

As with module and class declarations, a sub declaration
ending in semicolon is allowed at the outermost file scope if it is the
first such declaration, in which case the rest of the file is the body:

    sub MAIN ($directory, :$verbose, *%other, *@filenames);
    for @filenames { ... }

This form is allowed only for simple subs named C<MAIN> that are intended
to be run from the command line.
A C<proto> or C<multi> definition may not be written in semicolon form,
nor may C<MAIN> subs within a module or class be written in semicolon
form.  (A C<MAIN> routine
is allowed in a module or class, but is not usually invoked unless
the file is run directly (see a above).  This corresponds to the
"unless caller" idiom of Perl 5.)  In general, you may have only one
semicolon-style declaration that controls the whole file.

<masak> m: sub MAIN();␤say "OH HAI"
<camelia> rakudo-moar 1e4fe4: OUTPUT«===SORRY!=== Error while
compiling /tmp/A5naXHrUhH␤Missing block␤at /tmp/A5naXHrUhH:1␤------>
sub MAIN()⏏; [...]
* masak submits NYI rakudobug
<Mouq> masak: What's that supposed to do?
<masak> Mouq: whole-file MAIN only sub.
<Mouq> Ooo
<masak> S06:3408
<synopsebot> Link: http://perlcabal.org/syn/S06.html#line_3408
<Mouq> Could be useful for one-liners too...