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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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// PR c++/59200
// { dg-do compile { target c++17 } }
// { dg-additional-options "-fconcepts" }

struct A
{
  static constexpr bool value = true;
};

template<typename T>
struct B
{
  template<typename U>
    using C = A;
};

template<typename T>
template<typename U>
  const bool B<T>::C<U>::value;  // { dg-error "too many" }