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// P1064R0
// { dg-do compile { target c++11 } }
// { dg-options "-pedantic-errors" }

struct X
{
  constexpr virtual int f() { return 0; } // { dg-error "member .f. can be declared both .virtual. and .constexpr. only" "" { target c++17_down } }
};

n> X&) const noexcept(B) = default; bool operator==(const X&) const noexcept(!B) = default; }; X<true> x_t; static_assert(noexcept(x_t <=> x_t)); static_assert(noexcept(x_t < x_t)); static_assert(!noexcept(x_t == x_t)); static_assert(!noexcept(x_t != x_t)); X<false> x_f; static_assert(!noexcept(x_f <=> x_f)); static_assert(!noexcept(x_f < x_f)); static_assert(noexcept(x_f == x_f)); static_assert(noexcept(x_f != x_f));