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// RUN: %clang_cc1 -verify -std=c++1y %s
namespace PR17846 {
template <typename T> constexpr T pi = T(3.14);
template <typename T> constexpr T tau = 2 * pi<T>;
constexpr double tau_double = tau<double>;
static_assert(tau_double == 6.28, "");
}
namespace PR17848 {
template<typename T> constexpr T var = 12345;
template<typename T> constexpr T f() { return var<T>; }
constexpr int k = f<int>();
static_assert(k == 12345, "");
}
namespace NonDependent {
template<typename T> constexpr T a = 0;
template<typename T> constexpr T b = a<int>;
static_assert(b<int> == 0, "");
}
namespace InstantiationDependent {
int f(int);
void f(char);
template<int> constexpr int a = 1;
template<typename T> constexpr T b = a<sizeof(sizeof(f(T())))>; // expected-error {{invalid application of 'sizeof' to an incomplete type 'void'}}
static_assert(b<int> == 1, "");
static_assert(b<char> == 1, ""); // expected-note {{in instantiation of}} expected-error {{not an integral constant}}
template<typename T> void f() {
static_assert(a<sizeof(sizeof(f(T())))> == 0, ""); // expected-error {{static_assert failed}}
}
}
namespace PR24483 {
template<typename> struct A;
template<typename... T> A<T...> models;
template<> struct B models<>; // expected-error {{incomplete type 'struct B'}} expected-note {{forward declaration}}
}
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