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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.
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