[Bug c/115502] [15 regression] ICE when building Valgrind with -std=c23 (comptypes_same_p, at c/c-typeck.cc:1227)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115502

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
```
typedef struct _OSet OSet;
typedef OSet AvlTree;
void vgPlain_OSetGen_Lookup(const OSet *);
struct _OSet {};
void vgPlain_OSetGen_Lookup(const AvlTree *);
```