[Bug c++/95298] New: sorry, unimplemented: mangling record_type

[jonathan.poelen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95298

            Bug ID: 95298
           Summary: sorry, unimplemented: mangling record_type
           Product: gcc
           Version: 9.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jonathan.poelen at gmail dot com
  Target Milestone: ---

Since version 7 to trunk, the following code no longer compiles
(https://godbolt.org/z/_j5EUA)

template<class...>
struct list{};

template<int n>
struct _func_select
{
  using f = void;
};

struct func
{
  template<class... seqs>
  using f = typename _func_select<sizeof...(seqs)>::f;
};

template<class... T>
func::f<list<T>...> foo(T&&...)
{}

int main()
{
  foo();
}