clang/test/SemaCXX/coroutine-uninitialized-warning-crash.cpp

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin9 %s -std=c++20 -fsyntax-only -Wall -Wextra -Wuninitialized  -fblocks
   2 #include "Inputs/std-coroutine.h"
   3
   4 using namespace std;
   5
   6 struct A {
   7   bool await_ready() { return true; }
   8   int await_resume() { return 42; }
   9   template <typename F>
  10   void await_suspend(F) {}
  11 };
  12
  13
  14 struct coro_t {
  15   struct promise_type {
  16     coro_t get_return_object() { return {}; }
  17     suspend_never initial_suspend() { return {}; }
  18     suspend_never final_suspend() noexcept { return {}; }
  19     A yield_value(int) { return {}; }
  20     void return_void() {}
  21     static void unhandled_exception() {}
  22   };
  23 };
  24
  25 coro_t f(int n) {
  26   if (n == 0)
  27     co_return;
  28   co_yield 42;
  29   int x = co_await A{};
  30 }
  31
  32 template <class Await>
  33 coro_t g(int n) {
  34   if (n == 0)
  35     co_return;
  36   co_yield 42;
  37   int x = co_await Await{};
  38 }
  39
  40 int main() {
  41   f(0);
  42   g<A>(0);
  43 }