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fix: support experimental warnings and Sub::Import detection - #1936
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Accept experimental::for_list as a no-op category and align bundled Perl 5.44 warning masks, including experimental::builtin. Preserve the source stash in B::CV START so Sub::Import can recognize Sub::Exporter importers. Add focused tests for warning mask behavior and renamed Sub::Exporter imports. Fixes #1208 Fixes #1219 Fixes #1206 Generated with [Codex](https://openai.com/codex) Co-Authored-By: Codex <158243242+openai-codex[bot]@users.noreply.github.com>
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Summary
experimental::for_listas Perl 5.44's no-op warning category and align the bundled warning offsets, includingexperimental::builtin(Support the experimental::for_list warnings category #1208, Implement the experimental::builtin warnings category #1219).B::CV->START->stashpv, allowingSub::Importto detect Sub::Exporter importers (Fix Sub::Import detection of Sub::Exporter-based importers #1206).Validation
prove src/test/resources/unit/warnings_experimental_categories.t src/test/resources/unit/sub_import_sub_exporter_detection.t— passed on system Perl.nice -n 19 make— passed.Sub-Import-1.002/t/import-se.tpassed on both backends.nice -n 19 make check-links— passed.