[Bug c++/114728] New: Coroutine called in short-circuit fold expression

[Bug c++/114728] New: Coroutine called in short-circuit fold expression

[yunus at ayar dot eu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114728

            Bug ID: 114728
           Summary: Coroutine called in short-circuit fold expression
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: yunus at ayar dot eu
  Target Milestone: ---

Created attachment 57952
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57952&action=edit
Compressed version of a-test.ii

The following should print (and does with clang++ 17) only one `called` but it
prints it three times. Code (compiled with `g++ -std=c++20 test.cpp`):

```
#include <coroutine>
#include <iostream>

struct promise;

struct coroutine : std::coroutine_handle<promise> {
  using promise_type = ::promise;
  bool await_ready() { return true; }
  void await_suspend(std::coroutine_handle<> h) {}
  void await_resume() {}
};

struct promise {
  coroutine get_return_object() { return { coroutine::from_promise(*this) }; }
  std::suspend_never initial_suspend() noexcept { return {}; }
  std::suspend_always final_suspend() noexcept { return {}; }
  void return_void() {}
  void unhandled_exception() {}
};

inline coroutine test(auto)
{
  std::cout << "called\n";
  co_return;
}

inline coroutine do_one(auto... v)
{
  int i = 0;
  ((i++ == 1 && (co_await test(v), true)), ...);
}

int main() { do_one(1, 2, 3); }
```

I have also attached the compressed output of `g++ -save-temps`

[Bug c++/114728] Coroutine called in short-circuit fold expression

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114728

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think there is a dup of this bug somewhere ...

[Bug c++/114728] Coroutine called in short-circuit fold expression

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114728

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |101027

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
PR 101027


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101027
[Bug 101027] Short-circuit behavior not respected with co_await in while head