[Perl/perl5] 64e4a9: Assert sanity of name+len arguments to allocmy()

[Paul Evans via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 64e4a9d223cda0e14741e9d91910aec360824cbb
      
https://github.com/Perl/perl5/commit/64e4a9d223cda0e14741e9d91910aec360824cbb
  Author: Paul "LeoNerd" Evans <leon...@leonerd.org.uk>
  Date:   2025-08-15 (Fri, 15 Aug 2025)

  Changed paths:
    M op.c

  Log Message:
  -----------
  Assert sanity of name+len arguments to allocmy()

Recent discussons on github [1] found a bug when calling this function as

  allocmy("", 0, 0)

This ought not be allowed. The length must be at least 2, because the
function checks the first two characters of `name`.

[1]: https://github.com/Perl/perl5/pull/23574#discussion_r2278085750



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