[Bug c++/99242] [modules] ICE in lookup_mark, at cp/tree.c:2403

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99242

--- Comment #4 from Patrick Palka <ppalka at gcc dot gnu.org> ---
A curious reduction:

$ cat 99242_a.H
bool __is_constant_evaluated();

$ cat 99242_b.H
bool __is_constant_evaluated();

$ cat 99242_c.H
bool __is_constant_evaluated();

$ cat 99242_d.C
bool __is_constant_evaluated();                                                 
import "99242_a.H";                                
void f() { __is_constant_evaluated(); }                                         
import "99242_b.H";                                
import "99242_c.H";                                                             
void g() { __is_constant_evaluated(); } 

$ g++ -fmodules-ts 99241_*
99242_d.C: In function ‘void g()’:
99242_d.C:6:12: internal compiler error: in lookup_mark, at cp/tree.cc:2474
    6 | void g() { __is_constant_evaluated(); }
      |            ^~~~~~~~~~~~~~~~~~~~~~~