[Bug c++/78771] New: Internal compiler error when using inherited constructors

[richardg.work at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78771

            Bug ID: 78771
           Summary: Internal compiler error when using inherited
                    constructors
           Product: gcc
           Version: 5.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: richardg.work at gmail dot com
  Target Milestone: ---

The code below generates an internal compiler error.

Godbolt : https://godbolt.org/g/kgkbqy

<source>: In substitution of 'template<class U> D2::D2(U) [with U = int]':
<source>:23:12:   required by substitution of 'template<class U> D2::D2(U)
[with U = int]'
<source>:26:28:   required from here
<source>:23:12: internal compiler error: in instantiate_template_1, at
cp/pt.c:16113
using D1::D1;
          ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

First observed on Fedora 22 (gcc 5.4.0 built from source)


template <typename T>
struct StrictType
{
  template <typename U>
  StrictType(U) = delete;

  constexpr StrictType(T t) : m_value(t) {}

  T m_value {};
};

struct D2;

struct D1 : StrictType<int>
{
    using StrictType<int>::StrictType;
    D1(D2);
};

struct D2 : D1
{
    using D1::D1;
};

D1::D1(D2 v) : D1(v.m_value) {}