https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104020
Bug ID: 104020 Summary: [coroutines] ICE in co_await function call with initializer_list arguments Product: gcc Version: 11.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: me at xecycle dot info Target Milestone: --- Running example at https://godbolt.org/z/cEjTWPvYf, code with clang part removed is: #include <coroutine> using std::coroutine_handle; using std::suspend_always; using std::suspend_never; #include <initializer_list> #include <string_view> struct promise_t; struct ret_t { using promise_type = promise_t; }; struct promise_t { ret_t get_return_object() { return {}; } constexpr auto initial_suspend() noexcept { return suspend_never(); } void return_void() {} auto final_suspend() noexcept { return suspend_never(); } void unhandled_exception() { __builtin_trap(); } }; auto operator co_await(ret_t) { struct W { auto await_ready() { return std::true_type(); } void await_suspend(coroutine_handle<>) {} void await_resume() {} }; return W(); } ret_t f1(std::initializer_list<std::string_view>) { co_return; } ret_t f2() { co_await f1({"abc", "def"}); } ICE in 11.2, "array used as initializer" in trunk. Can compile if either: - the argument is std::initializer_list<int>, or - use a separate variable, like std::initializer_list<std::string_view> args {"abc", "def"}; co_await f1(args);