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Postings from December 2019
Re: Named Parameters
From:
Dave Mitchell
Date:
December 16, 2019 11:46
Subject:
Re: Named Parameters
Message ID:
20191216114529.GB3620@iabyn.com
On Sat, Nov 30, 2019 at 03:30:14PM +0000, Paul "LeoNerd" Evans wrote:
> > In terms of characters, the following are already taken, or might
> > be taken under some of the other proposals:
> >
> > $ @ % sigils
> > \ * aliasing
> > ? query parameter
> > , ) signature syntax
> > # comment
> >
> > Personally I think we should stick with ':'.
>
> I agree there aren't many characters left, but I wonder if this feature
> combined with attributes both using the colon, might get into any
> syntax ambiguities? There is already the existing collision between
> colon for sub arguments vs. named labels, which causes
>
> sub :attr { code here }
>
> to either parse as an attributed anonymous sub, or as a labeled call to
> attr() with a hashref constructor.
>
> It may be useful to stare carefully at both these features in
> combination to satisfy ourselves it won't be ambiguous.
The "name" colon can come only directly before a sigil-varname;
the attribute colon can only come directly after the varname, so there
should be no ambiguity.
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