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From the PR: The wording of [dcl.fct.def.coroutine]/15 states: * The expression co_await promise.final_suspend() shall not be potentially-throwing ([except.spec]). See http://eel.is/c++draft/dcl.fct.def.coroutine#15 and http://eel.is/c++draft/except.spec#6 ie. all of the following must be declared noexcept (if they form part of the await-expression): - promise_type::final_suspend() - finalSuspendObj.operator co_await() - finalSuspendAwaiter.await_ready() - finalSuspendAwaiter.await_suspend() - finalSuspendAwaiter.await_resume() - finalSuspedObj destructor - finalSuspendAwaiter destructor This implements the checks for these cases and rejects such code with a diagnostic if exceptions are enabled. gcc/cp/ChangeLog: PR c++/95616 * coroutines.cc (coro_diagnose_throwing_fn): New helper. (coro_diagnose_throwing_final_aw_expr): New helper. (build_co_await): Diagnose throwing final await expression components. (build_init_or_final_await): Diagnose a throwing promise final_suspend() call. gcc/testsuite/ChangeLog: PR c++/95616 * g++.dg/coroutines/pr95616-0-no-exceptions.C: New test. * g++.dg/coroutines/pr95616-0.C: New test. * g++.dg/coroutines/pr95616-1-no-exceptions.C: New test. * g++.dg/coroutines/pr95616-1.C: New test. * g++.dg/coroutines/pr95616-2.C: New test. * g++.dg/coroutines/pr95616-3-no-exceptions.C: New test. * g++.dg/coroutines/pr95616-3.C: New test. * g++.dg/coroutines/pr95616-4.C: New test. * g++.dg/coroutines/pr95616-5.C: New test. * g++.dg/coroutines/pr95616-6.C: New test.
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