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20 lines
1.2 KiB
Text
20 lines
1.2 KiB
Text
Perl module to prevent leakage of lexical hints
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Lexical::SealRequireHints works around two historical bugs in Perl's handling of
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the %^H (lexical hints) variable. One bug causes lexical state in one file to
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leak into another that is required/used from it. This bug, [perl #68590], was
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present from Perl 5.6 up to Perl 5.10, fixed in Perl 5.11.0. The second bug
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causes lexical state (normally a blank %^H once the first bug is fixed) to leak
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outwards from utf8.pm, if it is automatically loaded during Unicode regular
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expression matching, into whatever source is compiling at the time of the regexp
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match. This bug, [perl #73174], was present from Perl 5.8.7 up to Perl 5.11.5,
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fixed in Perl 5.12.0.
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Both of these bugs seriously damage the usability of any module relying on %^H
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for lexical scoping, on the affected Perl versions. It is in practice essential
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to work around these bugs when using such modules. On versions of Perl that
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require such a workaround, this module globally changes the behaviour of
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require, including use and the implicit require performed in Unicode regular
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expression matching, so that it no longer exhibits these bugs.
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WWW: https://metacpan.org/release/Lexical-SealRequireHints
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