[Bug c/117866] [15 regression] Confusing 'expected ... but argument is of type ...' (same type repeated)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117866

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Semi reduced:
```
struct XYspace {
       void (*convert)(struct fractpoint *pt);
} ;

struct fractpoint {
       double x,y;
} ;

struct segment {
       struct fractpoint dest;
} ;

void t1_Loc(register struct XYspace *S)
{
       register struct segment *r;
       (*S->convert)(&r->dest);//, S, x, y);
}
```