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exec(at_coroutine_exit): inherit start scheduler only when available #2106

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exec(at_coroutine_exit): inherit start scheduler only when available #2106

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7 changes: 5 additions & 2 deletions include/exec/at_coroutine_exit.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -157,8 +157,11 @@ namespace experimental::execution
template <__has_continuation _Promise>
auto await_suspend(__std::coroutine_handle<_Promise> __parent) -> bool
{
// Set the cleanup task's scheduler to the parent coroutine's scheduler.
__coro_.promise().__scheduler_ = get_start_scheduler(get_env(__parent.promise()));
// Set the cleanup task's scheduler to the parent coroutine's scheduler, if present
if constexpr (requires { get_start_scheduler(get_env(__parent.promise())); })
{
__coro_.promise().__scheduler_ = get_start_scheduler(get_env(__parent.promise()));
}
// This causes the parent to be resumed after the cleanup action is performed.
__coro_.promise().set_continuation(__parent.promise().continuation());
// This causes the parent to invoke the cleanup action when it performs the final
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