[Bug c++/107003] ICE in mangle_decl, at cp/mangle.cc:4112 since r6-1066-g233ce289250944dd

["marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107003

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|ICE in mangle_decl, at      |ICE in mangle_decl, at
                   |cp/mangle.cc:4112           |cp/mangle.cc:4112 since
                   |                            |r6-1066-g233ce289250944dd
                 CC|                            |hubicka at gcc dot gnu.org,
                   |                            |marxin at gcc dot gnu.org

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Reduced test-case:

$ cat pr107003.ii
template < typename _Default, template < typename > class >
using __detected_or_t = _Default;
template < typename, typename > struct __replace_first_arg;
template < template < typename... > class _Template, typename _Up, typename
_Tp,
           typename... _Types >
struct __replace_first_arg< _Template< _Tp, _Types... >, _Up > {
  using type = _Template< _Up >;
};
template < typename _Tp > using __pointer = typename _Tp::pointer;
template < typename _Tp > struct __rebind : __replace_first_arg< _Tp, int > {};
template < typename _Alloc, typename >
using __alloc_rebind = typename __rebind< _Alloc >::type;
template < typename _Alloc > struct allocator_traits {
  using pointer = __detected_or_t< typename _Alloc::value_type *, __pointer >;
  template < typename _Tp > using rebind_alloc = __alloc_rebind< _Alloc, _Tp >;
  static void deallocate(_Alloc __a, pointer __p, int __n) {
    __a.deallocate(__p, __n);
  }
};
template < typename _Alloc >
struct __alloc_traits : allocator_traits< _Alloc > {
  template < typename > struct rebind {
    typedef typename allocator_traits< _Alloc >::template rebind_alloc< int >
        other;
  };
};
template < typename _Alloc > struct _List_base {
  typedef __alloc_traits< _Alloc > _Tp_alloc_traits;
  typedef
      typename _Tp_alloc_traits::template rebind< int >::other
_Node_alloc_type;
  typedef __alloc_traits< _Node_alloc_type > _Node_alloc_traits;
  struct : _Node_alloc_type {
  } _M_impl;
  typename _Node_alloc_traits::pointer _M_put_node___p;
  _List_base() { _Node_alloc_traits::deallocate(_M_impl, _M_put_node___p, 1); }
};
namespace experimental {
inline namespace fundamentals_v2 {
void *deallocate___p;
long deallocate___bytes;
long deallocate___alignment;
struct memory_resource {
  void deallocate() {
    do_deallocate(deallocate___p, deallocate___bytes, deallocate___alignment);
  }
  virtual void do_deallocate(void *, unsigned long, unsigned long);
};
template < class > struct polymorphic_allocator {
  using value_type = int;
  void deallocate(int *, long) { _M_resource.deallocate(); }
  memory_resource _M_resource;
};
inline void null_memory_resource() {
  struct final : memory_resource {
    void do_deallocate(void *, unsigned long, unsigned long) {}
  };
}
template < typename _Tp >
using list = _List_base< polymorphic_allocator< _Tp > >;
} list< int > a;
}

started failing since r6-1066-g233ce289250944dd.