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[Perl/perl5] b2b5c0: S_scan_const: abort compilation after \N{} errors

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  [Perl/perl5] b2b5c0: S_scan_const: abort compilation after \N{} errors perl5-changes@perl.org (Richard Leach via perl5-changes) - 2026-01-29 14:16 -0800

#34307 — [Perl/perl5] b2b5c0: S_scan_const: abort compilation after \N{} errors

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: b2b5c0b5fc4c0876397298bfa6459ec385586e63
      https://github.com/Perl/perl5/commit/b2b5c0b5fc4c0876397298bfa6459ec385586e63
  Author: Richard Leach <richardleach@users.noreply.github.com>
  Date:   2026-01-29 (Thu, 29 Jan 2026)

  Changed paths:
    M t/lib/croak/toke
    M toke.c

  Log Message:
  -----------
  S_scan_const: abort compilation after \N{} errors

Upon encountering errors in parsing `\N{}` sequences, the parser used to
try to continue parsing for a bit before exiting. However, these errors
are - under certain circumstances - associated with problems with the
savestack being incorrectly adjusted.

GH #16930 is an example of this where:
* `PL_comppad_name` points to one struct during allocation of pad slots.
* Savestack activity causes `PL_comppad_name` to point somewhere else.
* The peephole optimiser is called, but needs `PL_comppad_name` to point
to the first struct to match up with the pad allocations.

With this commit, errors in parsing `\N{}` sequences are immediately fatal.



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