Commit
a09dc31d1 says:
It's possible that someone has built a module with -DDEBUGGING,
but they're using it against a perl built non-DEBUGGING, [...]
which means that the PL_scopestack_name symbol must always be exported.
Perl_pad_sv
Perl_hv_assert
PL_block_type
- PL_scopestack_name
PL_watchaddr
PL_watchok
PL_watch_pvx