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If the user provides operator new and that is noexcept, this implies that it can fail with a null return. At that point, we expect to be able to call get_return_object_on_allocation_failure(). This diagnoses the case where such an operator new has been provided, but the g-r-o-o-a-f is either missing or unusable. gcc/cp/ChangeLog: * coroutines.cc (morph_fn_to_coro): Diagnose unavailable get_return_object_on_allocation_failure. gcc/testsuite/ChangeLog: * g++.dg/coroutines/coro-bad-grooaf-01-grooaf-expected.C: New test.
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