--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaObjC/class-impl-1.m	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,40 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -Wno-objc-root-class %s
+
+typedef int INTF3; // expected-note {{previous definition is here}}
+
+@interface SUPER @end // expected-note {{previous definition is here}}
+
+@interface OBJECT @end
+
+@interface INTF  : OBJECT
+@end
+
+@implementation INTF @end // expected-note {{previous definition is here}}
+
+@implementation INTF //  expected-error {{reimplementation of class 'INTF'}}
+@end
+
+
+@interface INTF1 : OBJECT
+@end
+
+@implementation INTF1 : SUPER // expected-error {{conflicting super class name 'SUPER'}}
+@end
+
+@interface INTF2 
+@end
+
+@implementation INTF2 : SUPR //  expected-error {{cannot find interface declaration for 'SUPR', superclass of 'INTF2'}}
+@end
+
+@implementation INTF3 @end // expected-error {{redefinition of 'INTF3' as different kind of symbol}}
+
+@implementation INTF4 @end // expected-warning {{cannot find interface declaration for 'INTF4'}}
+
+@class INTF5; // expected-note{{forward declaration of class here}}
+
+@implementation INTF5 {  // expected-warning {{cannot find interface declaration for 'INTF5'}}
+  int x;
+}
+@end
+