Injecting definition after declaration of template function cause ambiguous function call

[DaemonSnake]

Hi!

I have a situation where I need to first declare a function template before defining it later on.
But when trying to inject the definition, instead of associating it to the declaration it handles it as a new function, causing subsequent calls to be "ambiguous".

minimal example:

  template<class T>
  void func();
  
  consteval -> fragment namespace {
      template<class T>
      void func() {}
  };
  
  int main() {
      func<int>(); // ambigous
  }

godbolt link: https://godbolt.org/z/Tfrddzz53

Thanks in advance ^^