[Bug c++/84421] [8 Regression] Lambda parameter is no longer a core constant expressions

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84421

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> Is that really a rejects-valid

Yes, bool(v) is a constant-expression.