text: // RUN: %clang_cc1 -std=c++14 -verify -fexceptions -fcxx-exceptions %s
  // RUN: %clang_cc1 -std=c++17 -verify -fexceptions -fcxx-exceptions %s -Wno-dynamic-exception-spec
  // RUN: %clang_cc1 -std=c++14 -verify -fexceptions -fcxx-exceptions -Wno-c++1z-compat-mangling -DNO_COMPAT_MANGLING %s
  // RUN: %clang_cc1 -std=c++14 -verify -fexceptions -fcxx-exceptions -Wno-noexcept-type -DNO_COMPAT_MANGLING %s
  
  #if __cplusplus > 201402L
  
  template<typename T> void redecl1() noexcept(noexcept(T())) {} // expected-note {{previous}}
  template<typename T> void redecl1() noexcept(noexcept(T())); // ok, same type
  template<typename T> void redecl1() noexcept(noexcept(T())) {} // expected-error {{redefinition}}
  
  template<bool A, bool B> void redecl2() noexcept(A); // expected-note {{previous}}
  template<bool A, bool B> void redecl2() noexcept(B); // expected-error {{does not match previous}}
  
  // These have the same canonical type, but are still different.
  template<typename A, typename B> void redecl3() throw(A); // expected-note {{previous}}
  template<typename A, typename B> void redecl3() throw(B); // expected-error {{does not match previous}}
  
  typedef int I;
  template<bool B> void redecl4(I) noexcept(B);
  template<bool B> void redecl4(I) noexcept(B); // expected-note {{could not match 'void (I) noexcept(false)' (aka 'void (int) noexcept(false)') against 'void (int) noexcept'}}
  
  void (*init_with_exact_type_a)(int) noexcept = redecl4<true>;
  void (*init_with_mismatched_type_a)(int) = redecl4<true>;
  auto deduce_auto_from_noexcept_function_ptr_a = redecl4<true>;
  using DeducedType_a = decltype(deduce_auto_from_noexcept_function_ptr_a);
  using DeducedType_a = void (*)(int) noexcept;
  
  void (*init_with_exact_type_b)(int) = redecl4<false>;
  void (*init_with_mismatched_type_b)(int) noexcept = redecl4<false>; // expected-error {{does not match required type}}
  auto deduce_auto_from_noexcept_function_ptr_b = redecl4<false>;
  using DeducedType_b = decltype(deduce_auto_from_noexcept_function_ptr_b);
  using DeducedType_b = void (*)(int);
  
  static_assert(noexcept(init_with_exact_type_a(0)));
  static_assert(noexcept((+init_with_exact_type_a)(0)));
  static_assert(!noexcept(init_with_exact_type_b(0)));
  static_assert(!noexcept((+init_with_exact_type_b)(0)));
  
  // Don't look through casts, use the direct type of the expression.
  // FIXME: static_cast here would be reasonable, but is not currently permitted.
  static_assert(noexcept(static_cast<decltype(init_with_exact_type_a)>(init_with_exact_type_b)(0))); // expected-error {{is not allowed}}
  static_assert(noexcept(reinterpret_cast<decltype(init_with_exact_type_a)>(init_with_exact_type_b)(0)));
  static_assert(!noexcept(static_cast<decltype(init_with_exact_type_b)>(init_with_exact_type_a)(0)));
  
  template<bool B> auto get_fn() noexcept -> void (*)() noexcept(B) {}
  static_assert(noexcept(get_fn<true>()()));
  static_assert(!noexcept(get_fn<false>()()));
  
  namespace DependentDefaultCtorExceptionSpec {
    template<typename> struct T { static const bool value = true; };
  
    template<class A> struct map {
      typedef A a;
      map() noexcept(T<a>::value) {}
    };
  
    template<class B> struct multimap {
      typedef B b;
      multimap() noexcept(T<b>::value) {}
    };
  
    // Don't crash here.
    struct A { multimap<int> Map; } a;
  
    static_assert(noexcept(A()));
  }
  
  #endif
  
  namespace CompatWarning {
    struct X;
  
    // These cases don't change.
    void f0(void p() throw(int));
    auto f0() -> void (*)() noexcept(false);
  
    // These cases take an ABI break in C++17 because their parameter / return types change.
    void f1(void p() noexcept);
    void f2(void (*p)() noexcept(true));
    void f3(void (&p)() throw());
    void f4(void (X::*p)() throw());
    auto f5() -> void (*)() throw();
    auto f6() -> void (&)() throw();
    auto f7() -> void (X::*)() throw();
  #if __cplusplus <= 201402L && !defined(NO_COMPAT_MANGLING)
    // expected-warning@-8 {{mangled name of 'f1' will change in C++17 due to non-throwing exception specification in function signature}}
    // expected-warning@-8 {{mangled name of 'f2' will change in C++17 due to non-throwing exception specification in function signature}}
    // expected-warning@-8 {{mangled name of 'f3' will change in C++17 due to non-throwing exception specification in function signature}}
    // expected-warning@-8 {{mangled name of 'f4' will change in C++17 due to non-throwing exception specification in function signature}}
    // expected-warning@-8 {{mangled name of 'f5' will change in C++17 due to non-throwing exception specification in function signature}}
    // expected-warning@-8 {{mangled name of 'f6' will change in C++17 due to non-throwing exception specification in function signature}}
    // expected-warning@-8 {{mangled name of 'f7' will change in C++17 due to non-throwing exception specification in function signature}}
  #endif
  
    // An instantiation-dependent exception specification needs to be mangled in
    // all language modes, since it participates in SFINAE.
    template<typename T> void g(void() throw(T)); // expected-note {{substitution failure}}
    template<typename T> void g(...) = delete; // expected-note {{deleted}}
    void test_g() { g<void>(nullptr); } // expected-error {{deleted}}
  
    // An instantiation-dependent exception specification needs to be mangled in
    // all language modes, since it participates in SFINAE.
    template<typename T> void h(void() noexcept(T())); // expected-note {{substitution failure}}
    template<typename T> void h(...) = delete; // expected-note {{deleted}}
    void test_h() { h<void>(nullptr); } // expected-error {{deleted}}
  }
  
  namespace ImplicitExceptionSpec {
    struct S {
      ~S();
      void f(const S &s = S());
    };
    S::~S() {}
  }
  
  namespace Builtins {
    // Pick two functions that ought to have the same noexceptness.
    extern "C" int strcmp(const char *, const char *);
    extern "C" int strncmp(const char *, const char *, decltype(sizeof(0))) noexcept;
  
    // Check we recognized both as builtins.
    typedef int arr[strcmp("bar", "foo") + 4 * strncmp("foo", "bar", 4)];
    typedef int arr[3];
  }
  
  namespace ExplicitInstantiation {
    template<typename T> void f() noexcept {}
    template<typename T> struct X { void f() noexcept {} };
    template void f<int>();
    template void X<int>::f();
  }
  
  namespace ConversionFunction {
    struct A { template<typename T> operator T() noexcept; };
    int a = A().operator int();
  }
  
  using size_t = decltype(sizeof(0));
  
  namespace OperatorDelete {
    struct W {};
    struct X {};
    struct Y {};
    struct Z {};
    template<bool N, bool D> struct T {};
  }
  void *operator new(size_t, OperatorDelete::W) noexcept(false);
  void operator delete(void*, OperatorDelete::W) noexcept(false) = delete; // expected-note {{here}}
  void *operator new(size_t, OperatorDelete::X) noexcept(false);
  void operator delete(void*, OperatorDelete::X) noexcept(true) = delete; // expected-note {{here}}
  void *operator new(size_t, OperatorDelete::Y) noexcept(true);
  void operator delete(void*, OperatorDelete::Y) noexcept(false) = delete; // expected-note {{here}}
  void *operator new(size_t, OperatorDelete::Z) noexcept(true);
  void operator delete(void*, OperatorDelete::Z) noexcept(true) = delete; // expected-note {{here}}
  template<bool N, bool D> void *operator new(size_t, OperatorDelete::T<N, D>) noexcept(N);
  template<bool N, bool D> void operator delete(void*, OperatorDelete::T<N, D>) noexcept(D) = delete; // expected-note 4{{here}}
  namespace OperatorDelete {
    struct A { A(); };
    A *w = new (W{}) A; // expected-error {{deleted function}}
    A *x = new (X{}) A; // expected-error {{deleted function}}
    A *y = new (Y{}) A; // expected-error {{deleted function}}
    A *z = new (Z{}) A; // expected-error {{deleted function}}
  
    A *t00 = new (T<false, false>{}) A; // expected-error {{deleted function}}
    A *t01 = new (T<false, true>{}) A; // expected-error {{deleted function}}
    A *t10 = new (T<true, false>{}) A; // expected-error {{deleted function}}
    A *t11 = new (T<true, true>{}) A; // expected-error {{deleted function}}
  }
  