test/SemaCXX/unknown-anytype.cpp

// RUN: %clang_cc1 -funknown-anytype -fsyntax-only -verify %s

namespace test0 {
  extern __unknown_anytype test0;
  extern __unknown_anytype test1();
  extern __unknown_anytype test2(int);
}

namespace test1 {
  extern __unknown_anytype foo;
  int test() {
    // TODO: it would be great if the 'cannot initialize' errors
    // turned into something more interesting.  It's just a matter of
    // making sure that these locations check for placeholder types
    // properly.

    int x = foo; // expected-error {{'foo' has unknown type}}
    int y = 0 + foo; // expected-error {{'foo' has unknown type}}
    return foo; // expected-error {{'foo' has unknown type}}
  }
}

namespace test2 {
  extern __unknown_anytype foo();
  void test() {
    foo(); // expected-error {{'foo' has unknown return type}}
  }
}

namespace test3 {
  extern __unknown_anytype foo;
  void test() {
    foo(); // expected-error {{call to unsupported expression with unknown type}}
    ((void(void)) foo)(); // expected-error {{variable 'foo' with unknown type cannot be given a function type}}
  }
}

// rdar://problem/9899447
namespace test4 {
  extern __unknown_anytype test0(...);
  extern __unknown_anytype test1(...);

  void test() {
    void (*fn)(int) = (void(*)(int)) test0;
    int x = (int) test1; // expected-error {{function 'test1' with unknown type must be given a function type}}
  }
}

// rdar://problem/23959960
namespace test5 {
  template<typename T> struct X; // expected-note{{template is declared here}}

  extern __unknown_anytype test0(...);

  void test() {
    (X<int>)test0(); // expected-error{{implicit instantiation of undefined template 'test5::X<int>'}}
  }
}

namespace test6 {
  extern __unknown_anytype func();
  extern __unknown_anytype var;
  double *d;

  void test() {
    d = (double*)&func(); // expected-error{{address-of operator cannot be applied to a call to a function with unknown return type}}
    d = (double*)&var;
  }

}