[Bug c++/98717] New: [c++20] variadic concept can't take empty pack

[ryan_greenblatt at brown dot edu via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98717

            Bug ID: 98717
           Summary: [c++20] variadic concept can't take empty pack
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ryan_greenblatt at brown dot edu
  Target Milestone: ---

```
template<typename... T>
concept True = true;

static_assert(True<>);
```
"error: invalid use concept ‘True<>’"

https://godbolt.org/z/ndfjzj

I'm suprised this hasn't been caught already... (assuming there isn't a
duplicate bug report I missed)