https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123828
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
CC| |mpolacek at gcc dot gnu.org
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I don't think is a bug. types_b is a template so can be promoted to consteval,
but types_a can not. You should make types_a consteval, then this test
compiles.