File: vt-57626.C

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gcc-riscv64-unknown-elf 8.3.0.2019.08%2Bdfsg-1
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// PR c++/57626
// { dg-do compile { target c++11 } }

struct symbol_set{};

template <typename T, template <typename ...> class TT, typename ... Args>
using bar = void(T::*)(TT<Args...> &, const symbol_set &);

struct converter
{
  template <typename Term, typename ... Args,
	    typename = decltype(bar<Term,Args...>(&Term::multiply))>  // { dg-error "pack expansion" }
  converter(const Term &);
};