https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122494
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[13/14/15/16 Regression] |[13/14 Regression] gcc
|gcc rejects valid C++ codes |rejects valid C++ codes
|with generic lambda and |with generic lambda and
|concepts; causing a not |concepts; causing a not
|completed class |completed class
--- Comment #9 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Fixed for 15.3/16 so far.