[Bug c++/114564] New: Accessing template Base via template Derived fails

[Bug c++/114564] New: Accessing template Base via template Derived fails

[benni.buch at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114564

            Bug ID: 114564
           Summary: Accessing template Base via template Derived fails
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: benni.buch at gmail dot com
  Target Milestone: ---

```cpp
template <typename T>
struct Base {};

template <typename T>
struct Derived: Base<T> {
    Derived(Derived::Base obj);
};
```

Accessing Base via Derived works with clang and MSVC, but not with GCC.

Live:

- https://godbolt.org/z/Wv3EK3e71

[Bug c++/114564] Accessing template Base via template Derived fails

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114564

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |rejects-valid
      Known to fail|                            |4.1.2
   Last reconfirmed|                            |2024-04-02

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
Simple workaround if needed is to place `typename` before `Derived::Base` . 
GCC is thinking `Derived::Base` is not a type for some reason ...