Re: issue #21044: mortalization of undef return

On Sat, May 06, 2023 at 10:25:04AM -0400, Ricardo Signes wrote:
> Porters,
> 
> This email is about a release blocker, #21044 <https://github.com/Perl/perl5/issues/21044>.
> 
> snowdrop:~$ perl5.36.0 -e '$_->{x} for sub { undef }->()'
> snowdrop:~$ echo $?
> 0
> 
> Great.  But:
> 
> snowdrop:~$ perl5.37.10 -e '$_->{x} for sub { undef }->()'
> Modification of a read-only value attempted at -e line 1.
> 
> This affects code on the CPAN, and it doesn't seem like an extremely unusual thing to expect out in the world.  Richard L. suggested we revert #20800 <https://github.com/Perl/perl5/pull/20800>.  Any objections or better ideas?

https://github.com/Perl/perl5/pull/21064

reverts c56d7fa91 aka #20800 while adding a test for the behaviour it broke.

Tony

• issue #21044: mortalization of undef return by Ricardo Signes
• Re: issue #21044: mortalization of undef return by Tony Cook
• Re: issue #21044: mortalization of undef return by Ricardo Signes