gh-132386: Fix a crash when passing a dict subclass to exec
#132412
Merged
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This issue boils down to a different branch being taken in
_PyEval_LoadGlobalStackRef
when a dict subclass is passed toexec
globals. There is one case where the stack ref is not set toPyStackRef_NULL
which causes the abort.obj != NULL
) inPyStackRef_FromPyObjectSteal
#132386