[Bug c++/127387] New: taking the address of consteval function not detected in comma op

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127387

            Bug ID: 127387
           Summary: taking the address of consteval function not detected
                    in comma op
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

```
consteval int foo () { return 42; }
void
g ()
{
  int i = (&foo, 42);
}
```

compiles correctly but we should say "cannot take address of consteval function
'foo' outside of an immediate invocation".

This came up in
<https://gcc.gnu.org/pipermail/gcc-patches/2026-September/729943.html>.