Reading a deleted namespace scalar recreates its stash entry
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评估
调研方向
Start with RuntimeStash.deleteNamespace and the stash enumeration path in HashSpecialVariable, then inspect t/basic.t and the standalone reproduction described in the issue. Trace how a qualified undefined scalar is handled after its namespace is deleted. Done means the child namespace remains absent after the scalar read, matching Perl's behavior on both PerlOnJava backends.
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描述
Summary
Deleting a package namespace from its parent stash does not keep that namespace deleted after a qualified scalar is read. This makes Text::Template 1.61's _scrubpkg cleanup assertion fail in t/basic.t on both PerlOnJava backends. System Perl passes the assertion, and the complete upstream suite passes there (22 files, 184 tests). The failure is included in archived CPAN run 20261104-151051-20617.
Root cause
RuntimeStash.deleteNamespace removes the namespace's current slots and marks the package freed. But stash enumeration in HashSpecialVariable reconstructs child-package entries from any qualified global slot it finds. A later read such as $Cleanup::GEN0::test creates an undefined scalar slot; enumeration then infers GEN0:: as a live child stash from that slot and exposes it again. The enumeration path does not honor the freed-stash marker, so this implicit scalar autovivification makes exists $Cleanup::{"GEN0::"} true again. The standalone script in the comment reproduces the behavior without a CPAN dependency.
Expected behavior
Reading an undefined scalar below a namespace deleted from its parent stash must not recreate that child namespace entry. Perl leaves the child absent in the same sequence.
- 主要语言
- Perl
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