src/third_party/llvm-project/clang/test/SemaObjC/method-in-class-extension-impl.m

// RUN: %clang_cc1  -fsyntax-only -verify %s
// expected-no-diagnostics
// rdar://8530080

@protocol ViewDelegate @end

@interface NSTextView
- (id <ViewDelegate>)delegate;
@end

@interface FooTextView : NSTextView
@end

@interface FooTextView() 
- (id)delegate;
@end

@implementation FooTextView
- (id)delegate {return 0; }
@end