[Bug c++/123608] New: [reflection] reflection in default arg rejected

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123608

            Bug ID: 123608
           Summary: [reflection] reflection in default arg rejected
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

```
#include <meta>
consteval bool f(int a, std::meta::info b = ^^a) { return is_variable(b); }
static_assert(f(42));
```

is rejected with:
error: default argument '^^a' uses local variable 'a'