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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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// PR c++/69095
// { dg-do compile { target c++11 } }

struct B1 {
  template <typename Ret, typename... Args, unsigned = sizeof(Args)> // { dg-error "parameter packs not expanded" }
  void insert(Ret);
};

struct B2 {
  template <typename Ret, typename... Args>
  void insert(Ret, unsigned = sizeof(Args)); // { dg-error "parameter packs not expanded" }
};

template <typename Ret, typename... Args, unsigned = sizeof(Args)> // { dg-error "parameter packs not expanded" }
void insert1(Ret);

template <typename Ret, typename... Args>
void insert2(Ret, unsigned = sizeof(Args)); // { dg-error "parameter packs not expanded" }