gcc/testsuite/g++.dg/coroutines/torture/co-ret-07-void-cast-expr.C

//  { dg-do run }

// Check that "co_return (void)expression;" evaluates expression once.

#include "../coro.h"

// boiler-plate for tests of codegen
#define RETURN_VOID
#include "../coro1-ret-int-yield-int.h"

int gX = 1;
__attribute__((__noinline__))
int foo (void) { PRINT ("called the int fn foo"); gX +=1 ; return gX; }

struct coro1
f () noexcept
{
  PRINT ("coro1: about to return");
  co_return (void)foo();
}

int main ()
{
  PRINT ("main: create coro1");
  struct coro1 x = f ();
  PRINT ("main: got coro1 - resuming");
  if (x.handle.done())
    abort();
  x.handle.resume();
  // We want to check that foo() was called exactly once.
  if (gX != 2) 
    {
      PRINT ("main: failed check for a single call to foo()");
      abort ();
    }
  PRINT ("main: after resume");
  if (!x.handle.done())
    {
      PRINT ("main: apparently not done...");
      abort ();
    }
  PRINT ("main: returning");
  return 0;
}