| Subject: | Fails with 5.28-to-be due to ancient Module::Install |
The bundled Module::Install (version 0.54) contains a bug in it, fixed by version 0.58. From the change-log:
0.58 Tue 4 Mar 2006 - Adam Kennedy
- Made Module::AutoInstall generally aware of AUTOMATED_TESTING
- Added compatibility with 5.9.3 proxy constants
...etc...
Those ‘proxy constants’ are scalar references stored directly in the stash.
Perl 5.28 will introduce a new optimisation allowing (almost) any sub to be stored as a sub ref in the stash, and this trips up this very old version of Module::Install.
From the perldelta for 5.27.6:
=head2 Subroutines no longer need typeglobs
Perl 5.22.0 introduced an optimization allowing subroutines to be stored in
packages as simple sub refs, not requiring a full typeglob (thus
potentially saving large amounts of memeory). However, the optimization
was flawed: it only applied to the main package.
This optimization has now been extended to all packages. This may break
compatibility with introspection code that looks inside stashes and expects
everything in them to be a typeglob.
When this optimization happens, the typeglob still notionally exists, so
accessing it will cause the stash entry to be upgraded to a typeglob. The
optimization does not apply to XSUBs or exported subroutines, and calling a
method will undo it, since method calls cache things in typeglobs.
[perl #129916] [perl #132252]