[Bug c/117724] [15 regression] ICE when building libgit2 (error: ‘TYPE_CANONICAL’ is not compatible)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117724

--- Comment #2 from Sam James <sjames at gcc dot gnu.org> ---
```
struct {
  unsigned long len;
  unsigned long size;
  char data[];
};
struct {
  struct {
    unsigned long len;
    unsigned long size;
    char data[6];
  }
};
```