[Bug c++/99479] [modules] ICE Aborted signal terminated program cc1plus

["alexander.lelyakin at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99479

--- Comment #3 from Alexander Lelyakin <alexander.lelyakin at googlemail dot com> ---
in gcc version 20210323:
All three sequences now produce "Segmentation fault" instead of "corrupted
double-linked list".

However the error "corrupted double-linked list" is still reproducible:
----
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cstdarg
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header source_location
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header locale
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header shared_mutex
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header compare
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header concepts
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cinttypes
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header numeric
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header string_view
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header iostream
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header variant
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header iosfwd
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cwchar
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header filesystem
----
corrupted double-linked list
corrupted double-linked list
g++: internal compiler error: Aborted signal terminated program cc1plus
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
----
g++ (GCC) 11.0.1 20210323 (experimental)
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