// RUN: %clang_cc1 -fsyntax-only %s -verify
// PR5692
enum x; // expected-note {{forward declaration}}
extern struct y a; // expected-note {{forward declaration}}
extern union z b; // expected-note 2 {{forward declaration}}
void foo() {
(enum x)1; // expected-error {{cast to incomplete type}}
(struct y)a; // expected-error {{cast to incomplete type}}
(union z)b; // expected-error {{cast to incomplete type}}
(union z)1; // expected-error {{cast to incomplete type}}
}