[Bug c++/128539] New: internal compiler error: same canonical type node for different types

[0599jiangyc at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128539

            Bug ID: 128539
           Summary: internal compiler error: same canonical type node for
                    different types
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: 0599jiangyc at gmail dot com
  Target Milestone: ---

The following code:
```cpp
struct A { void f (int = 0); };
typedef void (A::*PF) (int) __attribute__ ((ms_abi));
void g () { PF pf = &A::f; }
```

Resulted in this output:
```
<source>:3:25: internal compiler error: same canonical type node for different
types 'void (A::*)(int)' and 'PF' {aka 'void (A::*)(int)'}
```

Trunk reproducer: https://godbolt.org/z/767eYTrqz