[Bug c/121506] [15/16 Regression] ICE in c_type_tag with va_list

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121506

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-checking
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Target Milestone|---                         |15.3
   Last reconfirmed|                            |2025-08-11
            Summary|internal compiler error: in |[15/16 Regression] ICE in
                   |c_type_tag, at              |c_type_tag with va_list
                   |c/c-typeck.cc:610           |

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. Better testcase:
```
#include <stdarg.h>
struct Student;
struct X;
double sum(struct Student *x) {}
double sum(va_list args, struct X *x) {}
```

Confirmed.