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1// RUN: %clang_cc1 -fsyntax-only -Wunused-parameter -verify -std=c++20 %s2 3#include "Inputs/std-coroutine.h"4 5struct awaitable {6  bool await_ready() noexcept;7  void await_resume() noexcept;8  void await_suspend(std::coroutine_handle<>) noexcept;9};10 11struct task : awaitable {12  struct promise_type {13    task get_return_object() noexcept;14    awaitable initial_suspend() noexcept;15    awaitable final_suspend() noexcept;16    void unhandled_exception() noexcept;17    void return_void() noexcept;18  };19};20 21task foo(int a) { // expected-warning{{unused parameter 'a'}}22  co_return;23}24 25task bar(int a, int b) { // expected-warning{{unused parameter 'b'}}26  a = a + 1;27  co_return;28}29 30void create_closure() {31  auto closure = [](int c) -> task { // expected-warning{{unused parameter 'c'}}32    co_return;33  };34}35