gcc-4.9/gcc/testsuite/g++.dg/cpp0x/constexpr-targ.C


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// { dg-do compile { target c++11 } }

struct A
{
  constexpr operator double() { return 1.0; }
};

template <int I>
struct B
{ };

constexpr A a { };
B<a> b;				// { dg-error "template argument|invalid type" }