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Re: Perl feature wish: quote-word array-ref operator

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March 5, 2021 16:18
Re: Perl feature wish: quote-word array-ref operator
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Paul "LeoNerd" Evans writes:

> On Fri, 5 Mar 2021 15:28:01 +0100
> Graham Knop <> wrote:
> > perl -e'use strict; sub qa {} sub one {} sub two {} sub three {}
> > qa[one two three]; print "works\n"'
> > works
> > 
> > It's currently valid syntax. A feature flag would be necessary.
> I wonder if perl core should suggest that all two-letter q?-named
> functions are in fact at least reserved for future syntax?

How would that help, in terms of not breaking backwards compatibility?

If somebody already has a working system with a function legitimately
called qa(), P5P retrospectively ‘reserving’ it doesn't mean much: it
wasn't reserved when they wrote it, so it's imposing a backwards
compatible change on them.

However, I would love a qa[one two three] operator. Putting it behind a
feature flag is fine — so long as v5.42 (or whatever) enables it, it
won't be necessary to type the feature flag in full to make use of it
and retain backwards compatibility.


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