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From: "victor.burckel at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95823] New: [coroutines] compiler internal error in
 captures_temporary,
Date: Mon, 22 Jun 2020 19:05:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95823

            Bug ID: 95823
           Summary: [coroutines] compiler internal error in
                    captures_temporary,
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: victor.burckel at gmail dot com
  Target Milestone: ---

I get a compiler internal error when passing a value to a coroutine that is
retrieved through two inderections within smart pointers (I don't get the e=
rror
with raw pointers, that's the smallest piece of code I was able to produce).
> internal compiler error: in captures_temporary, at cp/coroutines.cc:2717

It can be easily worked around by making a local variable containing the va=
lue.
Of course the code would crash in runtime as the pointers are not initializ=
ed,
but I get the same error when initializing them.

I managed to reproduce with godbolt (both gcc10.1 and gcc trunk give me the
assertion)
https://godbolt.org/z/XarC_M

#include <coroutine>
#include <memory>

struct task {
  struct promise_type {
    auto initial_suspend() noexcept { return std::suspend_always{}; }
    auto final_suspend() noexcept { return std::suspend_always{}; }
    void return_void() {}
    task get_return_object() { return task{}; }
    void unhandled_exception() noexcept {}
  };

  ~task() noexcept {}

  bool await_ready() const noexcept { return false; }
  void await_suspend(std::coroutine_handle<>) noexcept {}
  void await_resume() noexcept {}
};

struct Id
{
    std::unique_ptr<int> value;
};

task g(int);

task f() {
    std::unique_ptr<Id> id;
    co_await g(*id->value);
}=