108 lines
3.5 KiB
C++
108 lines
3.5 KiB
C++
// RUN: %clang_cc1 -std=c++14 -fcoroutines -verify %s
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struct awaitable {
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bool await_ready();
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void await_suspend(); // FIXME: coroutine_handle
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void await_resume();
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} a;
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void no_coroutine_traits() {
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co_await a; // expected-error {{need to include <coroutine>}}
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}
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namespace std {
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template<typename ...T> struct coroutine_traits; // expected-note {{declared here}}
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};
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void no_specialization() {
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co_await a; // expected-error {{implicit instantiation of undefined template 'std::coroutine_traits<void>'}}
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}
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template<typename ...T> struct std::coroutine_traits<int, T...> {};
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int no_promise_type() {
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co_await a; // expected-error {{this function cannot be a coroutine: 'coroutine_traits<int>' has no member named 'promise_type'}}
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}
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struct promise; // expected-note {{forward declaration}}
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template<typename ...T> struct std::coroutine_traits<void, T...> { using promise_type = promise; };
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// FIXME: This diagnostic is terrible.
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void undefined_promise() { // expected-error {{variable has incomplete type 'promise_type'}}
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co_await a;
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}
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struct promise {};
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void mixed_yield() {
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co_yield 0; // expected-note {{use of 'co_yield'}}
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return; // expected-error {{not allowed in coroutine}}
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}
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void mixed_await() {
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co_await a; // expected-note {{use of 'co_await'}}
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return; // expected-error {{not allowed in coroutine}}
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}
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void only_coreturn() {
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co_return; // expected-warning {{'co_return' used in a function that uses neither 'co_await' nor 'co_yield'}}
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}
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void mixed_coreturn(bool b) {
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if (b)
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// expected-warning@+1 {{'co_return' used in a function that uses neither}}
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co_return; // expected-note {{use of 'co_return'}}
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else
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return; // expected-error {{not allowed in coroutine}}
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}
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struct CtorDtor {
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CtorDtor() {
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co_yield 0; // expected-error {{'co_yield' cannot be used in a constructor}}
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}
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CtorDtor(awaitable a) {
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// The spec doesn't say this is ill-formed, but it must be.
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co_await a; // expected-error {{'co_await' cannot be used in a constructor}}
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}
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~CtorDtor() {
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co_return 0; // expected-error {{'co_return' cannot be used in a destructor}}
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}
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// FIXME: The spec says this is ill-formed.
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void operator=(CtorDtor&) {
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co_yield 0;
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}
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};
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constexpr void constexpr_coroutine() { // expected-error {{never produces a constant expression}}
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co_yield 0; // expected-error {{'co_yield' cannot be used in a constexpr function}} expected-note {{subexpression}}
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}
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void varargs_coroutine(const char *, ...) {
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co_await a; // expected-error {{'co_await' cannot be used in a varargs function}}
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}
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struct outer {};
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namespace dependent_operator_co_await_lookup {
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template<typename T> void await_template(T t) {
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// no unqualified lookup results
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co_await t; // expected-error {{no member named 'await_ready' in 'dependent_operator_co_await_lookup::not_awaitable'}}
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// expected-error@-1 {{call to function 'operator co_await' that is neither visible in the template definition nor found by argument-dependent lookup}}
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};
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template void await_template(awaitable);
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struct indirectly_awaitable { indirectly_awaitable(outer); };
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awaitable operator co_await(indirectly_awaitable); // expected-note {{should be declared prior to}}
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template void await_template(indirectly_awaitable);
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struct not_awaitable {};
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template void await_template(not_awaitable); // expected-note {{instantiation}}
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template<typename T> void await_template_2(T t) {
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// one unqualified lookup result
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co_await t;
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};
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template void await_template(outer); // expected-note {{instantiation}}
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template void await_template_2(outer);
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}
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