Branch: refs/heads/yves/import_error2deprecation
Home: https://github.com/Perl/perl5
Commit: 907695add47edd07245abeb9f8065af8bbf458fa
https://github.com/Perl/perl5/commit/907695add47edd07245abeb9f8065af8bbf458fa
Author: Yves Orton <[email protected]>
Date: 2023-07-25 (Tue, 25 Jul 2023)
Changed paths:
M lib/warnings.pm
M pod/perldeprecation.pod
M regen/warnings.pl
M t/op/universal.t
M universal.c
M warnings.h
Log Message:
-----------
universal.c - change import with args error to be a deprecated warning
We have had a LOT of fallout from 2dcf3cf50d7 as it turns out that
there various common cases of people accidentally exploiting the
silent use of missing import with arguments. The premise of detecting
this was that it would allow us to detect scenarios where users
on a case-insensitive file-system had a typo. But it turns that there
are a lot of accidental cases of this as well, a lot more than we
expected.
Common mistaken cases are:
* Via use_ok() where people think the second argument is a test
name instead of an argument to the import of the module being
used.
* Using a quoted version number in a version check instead of a true
number. IE:
use Foo '1.234';
gets passed to Foo->import() and not Foo->VERSION(). This is
compounded by the fact that Exporter->import() *does* support a
version check via import(). Arguably if we allow string versions
(IMO we should) then we should deal with this in the parser, not
in import() (although the latter is a little more debatable IMO).
* Explicit calls to import() with a version number.
* Mistakenly requesting an export from a module that doesn't
actually export anything. One possible explanation for this case
is that a module was at one point in its lifetime not a class, but
then was later on turned into a class and the arguments to use
statements weren't changed even though the main code was
changed to use class syntax.
Because of the scope of the breakage of the original error this patch
downgrades the error to a depecation warning instead, with the intention
that in 5.44 we will make it a hard error.
