1 // RUN: %clang_cc1 -std=c++14 -fsyntax-only -verify %s
2
3 struct A {
operator __auto_typeA4 operator __auto_type() {} // expected-error {{'__auto_type' not allowed in conversion function type}}
5 };
6
7 __auto_type a() -> int; // expected-error {{function with trailing return type must specify return type 'auto'}}
8 __auto_type a2(); // expected-error {{'__auto_type' not allowed in function return type}}
9 template <typename T>
b()10 __auto_type b() { return T::x; } // expected-error {{'__auto_type' not allowed in function return type}}
c()11 auto c() -> __auto_type { __builtin_unreachable(); } // expected-error {{'__auto_type' not allowed in function return type}}
d()12 int d() {
13 decltype(__auto_type) e = 1; // expected-error {{expected expression}}
14 auto _ = [](__auto_type f) {}; // expected-error {{'__auto_type' not allowed in lambda parameter}}
15 __auto_type g = 2;
16 struct BitField { int field:2; };
17 __auto_type h = BitField{1}.field; // (should work from C++)
18 new __auto_type; // expected-error {{'__auto_type' not allowed in type allocated by 'new'}}
19 }
20
21 namespace TestDeductionFail {
22
23 template<typename T>
caller(T x)24 void caller(T x) {x.fun();} // expected-error {{parameter type 'TestDeductionFail::Abstract' is an abstract class}}
25
26 template<typename T>
getCaller()27 auto getCaller(){
28 return caller<T>; // expected-note {{in instantiation of function template specialization 'TestDeductionFail::caller<TestDeductionFail::Abstract>' requested here}}
29 }
30
31 class Abstract{
32 public:
33 void fun();
34 virtual void vfun()=0; // expected-note {{unimplemented pure virtual method 'vfun' in 'Abstract'}}
call()35 void call(){getCaller<Abstract>()(*this);} // expected-error {{allocating an object of abstract class type 'TestDeductionFail::Abstract'}}
36 };
37
38 }
39