https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97438
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Iain D Sandoe <ia...@gcc.gnu.org>: https://gcc.gnu.org/g:4bca11333c274ab5d06677ed952afa097c7d3c78 commit r10-9197-g4bca11333c274ab5d06677ed952afa097c7d3c78 Author: Iain Sandoe <i...@sandoe.co.uk> Date: Sat Oct 17 11:21:11 2020 +0100 coroutines: Emit error for invalid promise return types [PR97438]. At one stage, use cases were proposed for allowing the promise type to contain both return_value and return_void. That was not accepted into C++20, so we should reject it as per the PR. gcc/cp/ChangeLog: PR c++/97438 * coroutines.cc (struct coroutine_info): Add a field to record that we emitted a promise type error. (coro_promise_type_found_p): Check for the case that the promise type contains both return_void and return_value. Emit an error if so, with information about the wrong type methods. gcc/testsuite/ChangeLog: PR c++/97438 * g++.dg/coroutines/pr97438.C: New test. (cherry picked from commit b003c4b14b3f889e6707db68d2c6545eda7a203b)
