PP code uses of curcop
----------------------
pp_rv2gv
when a new glob is created for an OPpLVAL_INTRO,
curcop->cop_line is stored as GvLINE() in the new GP.
pp_bless
curcop->cop_stash is used as the stash in the one-arg form of bless
pp_repeat
tests (curcop != &compiling) to warn "Can't x= to readonly value"
pp_pos
pp_substr
pp_index
pp_rindex
pp_aslice
pp_lslice
pp_splice
curcop->cop_arybase
pp_sort
curcop->cop_stash used to determine whether to gv_fetchpv $a and $b
pp_caller
tests (curcop->cop_stash == debstash) to determine whether
to set DB::args
pp_reset
resets vars in curcop->cop_stash
pp_dbstate
sets curcop = (COP*)op
doeval
compiles into curcop->cop_stash
pp_nextstate
sets curcop = (COP*)op
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