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Postings from February 2022
On Thu, 3 Feb 2022 22:23:13 +0000
"Paul \"LeoNerd\" Evans" <leonerd@leonerd.org.uk> wrote:
> I would much rather just remove the behaviour entirely.
>
> We could get rid of the HINT_EXPLICIT_STRICT_* bits altogether, and
> simply state that a `use VERSION` of any number 5.12-or-above is
> *exactly* equivalent to `use strict`, or a number 5.10-or-earlier is
> exactly `no strict`. This would let us simplify our implementation,
> tests, and most importantly user-facing documentation around the `use
> VERSION` syntax. And it would gain us three precious hints bits back
> for other purposes.
>
>
> Thoughts, anyone?
We discussed this at PSC today and this generally seems the right thing
to do.
One additional thought is that it should print a warning when you
downgrade the `use VERSION` in these cases where the behaviour now
changes.
I now have a WIP branch doing just so:
https://github.com/leonerd/perl5/tree/deprecate-downgrading-use-version
It behaves as:
$ ./perl -e 'use v5.35.9; use v5.8;'
Downgrading a use VERSION declaration to below v5.11 is now deprecated
at -e line 1.
But this is fine:
$ ./perl -ce 'use v5.35.9; use v5.12;'
-e syntax OK
It is lexically scoped, so this is also fine:
$ ./perl -ce '{ use v5.35.9; } use v5.8;'
-e syntax OK
And it of course only gets upset about downgrades; upgrades are fine:
$ ./perl -ce 'use v5.6; use v5.8; use v5.14'
-e syntax OK
It's quite conservative and only prints a warning if the downgrade
actually matters for possible `strict` interactions - i.e. you're
requesting a version below v5.11 and there has already been a version
above that previously.
(*Personally* I think the warning should be printed on *any* downgrade
at all, but various folks have argued that might be a bit too
restrictive for now, so I haven't done that.)
Once I get this branch fully working (it fails some tests currently)
I'll pop some proper documentation into it and send a PR, as a
pre-requisite for getting rid of the EXPLICIT_STRICT hints bits, at
which point we'll have three spare.
--
Paul "LeoNerd" Evans
leonerd@leonerd.org.uk | https://metacpan.org/author/PEVANS
http://www.leonerd.org.uk/ | https://www.tindie.com/stores/leonerd/
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