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-rw-r--r--clang/test/Sema/cast-incomplete.c14
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diff --git a/clang/test/Sema/cast-incomplete.c b/clang/test/Sema/cast-incomplete.c
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+// 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}}
+}
+