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Subject: [Bug c++/96251] [constexpr, coroutines] co_yield incorrectly
 rejected in non-explicitly-constexpr generic lambda
Date: Wed, 24 Feb 2021 11:57:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96251

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Iain D Sandoe <iains@gcc.gnu.org>:

https://gcc.gnu.org/g:f13d9e48eeca7ed8f8df55c9a62fc9980d5606ad

commit r11-7357-gf13d9e48eeca7ed8f8df55c9a62fc9980d5606ad
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Tue Feb 23 12:54:26 2021 +0000

    coroutines : Adjust error handling for type-dependent coroutines [PR962=
51].

    Although coroutines are not permitted to be constexpr, generic lambdas
    are implicitly from C++17 and, because of this, a generic coroutine lam=
bda
    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_conste=
xpr'
    but suppresses the error in the case that we are instantiating a conste=
xpr.

    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.=