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global match data and context #19
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See PR #18 for the data part, #6 for the context parts.
There are two independent global contexts: compile and match.
#18 regressed in one
t/perl/regexp.t
test. 1840 with an uninitialized stack element st.reg_sv.sometimes this even gives an
regexp memory corruption
error in the #18 branch match-data-comp-alloc, sometimes alsocorrupted regexp pointers
. Wrong restauration of st.reg_sv after the nested codeblock fallback.asan reports a heap-buffer-overflow in S_regmatch.
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