Fix __tracebackhide__ not respected in ExceptionGroup sub-exception tracebacks - #14649
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RonnyPfannschmidt merged 2 commits intoAug 25, 2026
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…racebacks ExceptionGroup tracebacks use the native style via traceback.format_exception. The top-level traceback gets filtered, but format_exception then walks each sub-exception's original __traceback__ and renders those frames unfiltered, so __tracebackhide__ set inside a sub-exception's call stack has no effect. Fix by building a traceback.TracebackException and filtering its stack in place, recursing into sub-exceptions and __cause__/__context__ chains. Original exception objects are not mutated. Closes pytest-dev#14036
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ExceptionGroup tracebacks use the native style, which calls
traceback.format_exceptionwith the group's traceback. The top-leveltraceback gets filtered for
__tracebackhide__, butformat_exceptionthenwalks each sub-exception's original
__traceback__and renders those framesunfiltered, so
__tracebackhide__set inside a sub-exception's call stack hasno effect.
Fix by building a
traceback.TracebackExceptionand filtering itsstackinplace, recursing into sub-exceptions and
__cause__/__context__chains. Theoriginal exception objects are not mutated. Native output style is kept.
Closes #14036