Jakub Jelinek <jakub at gcc dot> changed:

           What    |Removed                     |Added
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-02-22
                 CC|                            |jakub at gcc dot,
                   |                            |jason at gcc dot
            Version|unknown                     |7.0
   Target Milestone|---                         |6.5
            Summary|Internal compiler error     |[6/7 Regression] Internal
                   |with lambda, static and     |compiler error with lambda,
                   |auto                        |static and auto since
                   |                            |r236615
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot> ---
Started with r236615 and got fixed on the trunk with r253600.

Reduced testcase:

// PR c++/84496
// { dg-do compile { target c++14 } }

template <typename T, T n> struct C { static constexpr T D = n; };
struct E : C<bool, false> {};
template <typename> struct F : C<bool, false> {};
template <typename T> T foo ();
template <typename> struct H { typedef int G; };
template <typename> class I;
struct L;
template <typename, typename> struct J;
template <bool, bool, typename...> struct K;
struct R {
  template <typename M, typename... N>
  static J<decltype (foo<M> () (foo<N>...)), L> o;
template <typename P, typename... Q> struct K<false, false, P, Q...> : R {
  typedef decltype (o<P, Q...>) G;
template <typename P, typename... Q>
struct D : K<E::D, F<typename H<P>::G>::D, P, Q...> {};
template <typename P, typename... Q> struct I<P (Q...)> : D<P, Q...> {};
template <typename> class function;
template <typename S, typename... Q> struct function<S (Q...)> {
  template <typename T, typename = typename I<T (Q...)>::G> struct C;
  template <typename, typename> using U = int;
  template <typename P, typename = U<int, void>, typename = U<C<P>, void>>
  function (P);
template <typename S, typename... Q>
template <typename P, typename, typename>
function<S (Q...)>::function (P)
void bar (function<void (int)>);

baz ()
  auto a = [] {
    static int counter;
    bar ([] (auto) { counter++; });

Will commit the testcase to trunk now to make sure we don't regress it again.

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