https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96251
--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Iain D Sandoe <ia...@gcc.gnu.org>: https://gcc.gnu.org/g:f13d9e48eeca7ed8f8df55c9a62fc9980d5606ad commit r11-7357-gf13d9e48eeca7ed8f8df55c9a62fc9980d5606ad Author: Iain Sandoe <i...@sandoe.co.uk> Date: Tue Feb 23 12:54:26 2021 +0000 coroutines : Adjust error handling for type-dependent coroutines [PR96251]. Although coroutines are not permitted to be constexpr, generic lambdas are implicitly from C++17 and, because of this, a generic coroutine lambda can be marked as potentially constexpr. As per the PR, this then fails when type substitution is attempted because the check disallowing constexpr in the coroutines code was overly restrictive. This changes the error handing to mark the function as 'invalid_constexpr' but suppresses the error in the case that we are instantiating a constexpr. gcc/cp/ChangeLog: PR c++/96251 * coroutines.cc (coro_common_keyword_context_valid_p): Suppress error reporting when instantiating for a constexpr. gcc/testsuite/ChangeLog: PR c++/96251 * g++.dg/coroutines/pr96251.C: New test.
