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Postings from February 2022
On Fri, 4 Feb 2022 07:36:21 +0800
Tom Molesworth via perl5-porters <perl5-porters@perl.org> wrote:
> The concept seems reasonable, just not too clear on exactly what's
> being suggested - would this affect these two cases, for example?
>
> { # Only using some of the features, e.g. variables should be
> declared, but keep barewords and symbolic references enabled
> use strict 'vars';
> our $x = example; # should be fine
> $y = 'compile-time error'; # should fail
> }
>
> and
>
> use strict;
> { # limited-scope disabling of a feature
> no strict 'refs';
> our $typo;
> my $name = 'whatever';
> *$name = sub { # this part is fine
> ++$tpyo # would want a compile-time error here
> };
> }
Those two examples would be exactly as they are, entirely unaffected.
My suggestion only relates to the *implict* enabling of strictness
flags by the `use VERSION` syntax. Or rather, the way that strictness
flags are turned off - or not - by a later `use VERSION` declaration
giving a version number under 5.12, after you have explicitly turned
them on by a `use strict` statement.
For example,
use v5.14;
use strict;
our $typo;
use v5.0;
++$tpyo; # the strictness flags would now be turned off.
In practice it is *extremely* rare to see subsequent `use VERSION`
declarations after the first one at the top of a file, and then even
rarer to see them specify a smaller version number than 5.12. I think
it extremely unlikely there is any real code around that would be
affected by the proposed change.
The only situations that would be affected require both:
* An explicit `use strict` or `use strict SOMEFLAGS`
* A `use VERSION` of a version number smaller than v5.12 on a line
later on
If you never `use v5` or `use v5.0` or whatever (of a number smaller
than v5.12), or the only `use v5` line is the first line in the file (or
at least, above any `use strict`) then no difference to current
behaviour is expected.
--
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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