[Bug c++/68159] Demangler crash (GDB PR 19190)

[clopez at igalia dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68159

--- Comment #10 from Carlos Alberto Lopez Perez <clopez at igalia dot com> ---
It seems c++filt also crashes with the very same test case:

$ echo
'_ZSt7forwardIRKZN5Write14DataMapGrammarISt20back_insert_iteratorISsEEC4EvEUlRT_E_EOS5_RNSt16remove_referenceIS5_E4typeE'|c++filt
Segmentation fault (core dumped)