GCCRS crashes with SIGKILL on unclosed macro invocation

[starbugs-qurong]

Summary

When compiling code with an unclosed macro delimiter (e.g. y![ without closing ]), GCCRS crashes with a fatal signal instead of producing a proper diagnostic message.

Reproducer

I tried this code:

y![

Does the code make use of any (1.49) nightly feature ?

• [ ] Nightly

Godbolt link

No response

Actual behavior

gccrs: fatal error: Killed signal terminated program crab1

Expected behavior

A syntax error message about unclosed delimiters.

GCC Version

14.0.1

[starbugs-qurong]

Another minimal reproducer with an unclosed attribute also triggers GCCRS failure:

#[Ѕ