clang/test/SemaCXX/warn-unused-parameters-coroutine.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -Wunused-parameter -verify -std=c++20 %s
   2
   3 #include "Inputs/std-coroutine.h"
   4
   5 struct awaitable {
   6   bool await_ready() noexcept;
   7   void await_resume() noexcept;
   8   void await_suspend(std::coroutine_handle<>) noexcept;
   9 };
  10
  11 struct 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
  21 task foo(int a) { // expected-warning{{unused parameter 'a'}}
  22   co_return;
  23 }
  24
  25 task bar(int a, int b) { // expected-warning{{unused parameter 'b'}}
  26   a = a + 1;
  27   co_return;
  28 }
  29
  30 void create_closure() {
  31   auto closure = [](int c) -> task { // expected-warning{{unused parameter 'c'}}
  32     co_return;
  33   };
  34 }