1 // RUN: %clang_cc1 -std=c++2a -verify %s 2 3 void *operator new(__SIZE_TYPE__, void*); 4 5 // Check that we give a good diagnostic for an attempt to use a postfix 6 // operator after a unary-expression. 7 namespace postfix_after_unary { 8 struct A { int n; }; 9 int &a = new A->n; // expected-error {{expression cannot be followed by a postfix '->' operator; add parentheses}} 10 11 struct B { B(int); int operator()(int); }; 12 int n = new (0) (B) (int()) (int()); // expected-error {{cannot be followed by a postfix '(}} expected-error {{not a function or function pointer}} 13 14 char x = sizeof(int)["hello"]; // expected-error {{cannot be followed by a postfix '[}} 15 char y = alignof(int)["hello"]; // expected-error {{cannot be followed by a postfix '[}} 16 char z = noexcept(0)["hello"]; // expected-error {{cannot be followed by a postfix '[}} 17 char w = requires { x == x; }["ny"]; // expected-error {{cannot be followed by a postfix '[}} 18 f()19 int f() { 20 label: 21 return &&label->n; // expected-error {{cannot be followed by a postfix}} expected-error {{not a structure or union}} 22 } 23 24 char k = sizeof(int) // expected-error {{expected ';'}} 25 [[noreturn]] void g(); 26 } 27 28 // Check that we do parse postfix-expression suffixes after some more unusual 29 // kinds of postfix-expressions (null literals and builtin calls). 30 namespace unusual_primary_exprs { 31 int a = nullptr["foo"]; // expected-error {{array subscript is not an integer}} 32 int b = __builtin_COLUMN()["sufficiently long string constant"]; 33 int c = __builtin_available(*)["ny"]; 34 static_assert(__null["foo"] == 'f'); // FIXME: Warn about converting __null to integer in array subscripting. 35 static_assert(__is_standard_layout(int)["ny"] == 'y'); 36 static_assert(__array_rank(int[1][2])["0123"] == '2'); 37 static_assert(__is_lvalue_expr(a)["ny"] == 'y'); 38 } 39