[Bug c++/123261] New: ICE in diagnostics when using implicit constexpr

[addr2line at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123261

            Bug ID: 123261
           Summary: ICE in diagnostics when using implicit constexpr
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: addr2line at gmail dot com
  Target Milestone: ---

```c++
class A {
   public:
    A() { asm volatile(""); }
    ~A() {}
};

constexpr bool test() {
    A a;
    return true;
}

static_assert(test());
```

Already have a patch for this.