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The standard now calls up a revised mechanism to handle exceptions where exceptions thrown by the await_resume () method of the initial suspend expression are considered in the same manner as exceptions thrown by the user-authored function body. This implements [dcl.fct.def.coroutine] / 5.3. gcc/cp/ChangeLog: 2020-03-26 Iain Sandoe <iain@sandoe.co.uk> * coroutines.cc (co_await_expander): If we are expanding the initial await expression, set a boolean flag to show that we have now reached the initial await_resume() method call. (expand_co_awaits): Handle the 'initial await resume called' flag. (build_actor_fn): Insert the initial await expression into the start of the user-authored function-body. Handle the 'initial await resume called' flag. (morph_fn_to_coro): Initialise the 'initial await resume called' flag. Modify the unhandled exception catch clause to recognise exceptions that occur before the initial await_resume() and re- throw them. gcc/testsuite/ChangeLog: 2020-03-26 Iain Sandoe <iain@sandoe.co.uk> * g++.dg/coroutines/torture/exceptions-test-01-n4849-a.C: New test.
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