[Bug modula2/112920] gm2 hangs in the type resolver

[gaius at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112920

--- Comment #2 from Gaius Mulley <gaius at gcc dot gnu.org> ---
Created attachment 57011
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57011&action=edit
Proposed fix

Here is a proposed fix which compiles the previous attached test cases and
causes no extra regression test failures.