2 files changed, 56 insertions, 0 deletions
diff --git a/lib/AST/DeclObjC.cpp b/lib/AST/DeclObjC.cpp
index 0458282fb3..85b8ec14e0 100644
--- a/lib/AST/DeclObjC.cpp
+++ b/lib/AST/DeclObjC.cpp
@@ -685,6 +685,14 @@ ObjCMethodDecl *ObjCInterfaceDecl::lookupInstanceMethod(Selector Sel) {
     while (CatDecl) {
       if ((MethodDecl = CatDecl->getInstanceMethod(Sel)))
         return MethodDecl;
+        
+      // Didn't find one yet - look through protocols.
+      const ObjCList<ObjCProtocolDecl> &Protocols =
+        CatDecl->getReferencedProtocols();
+      for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
+           E = Protocols.end(); I != E; ++I)
+        if ((MethodDecl = (*I)->getInstanceMethod(Sel)))
+          return MethodDecl;
       CatDecl = CatDecl->getNextClassCategory();
     }
     ClassDecl = ClassDecl->getSuperClass();
diff --git a/test/SemaObjC/super-cat-prot.m b/test/SemaObjC/super-cat-prot.m
new file mode 100644
index 0000000000..ef4c0ebc3f
--- /dev/null
+++ b/test/SemaObjC/super-cat-prot.m
@@ -0,0 +1,48 @@
+// RUN: clang -fsyntax-only -verify %s
+typedef signed char BOOL;
+typedef unsigned int NSUInteger;
+@class NSInvocation, NSMethodSignature, NSCoder, NSString, NSEnumerator;
+@protocol NSObject  - (BOOL)isEqual:(id)object; @end
+@protocol NSCoding  - (void)encodeWithCoder:(NSCoder *)aCoder; @end
+@interface NSObject <NSObject> {} @end
+typedef float CGFloat;
+typedef struct _NSSize {} NSSize;
+typedef struct _NSRect {} NSRect;
+@interface NSResponder : NSObject <NSCoding> {} @end
+@protocol NSAnimatablePropertyContainer - (id)animator; @end
+extern NSString *NSAnimationTriggerOrderIn ;
+@interface NSView : NSResponder  <NSAnimatablePropertyContainer>  {} @end
+@class NSAttributedString, NSEvent, NSFont, NSFormatter, NSImage, NSMenu, NSText, NSView;
+enum { NSBoxPrimary = 0, NSBoxSecondary = 1, NSBoxSeparator = 2, NSBoxOldStyle = 3, NSBoxCustom = 4};
+typedef NSUInteger NSBoxType;
+@interface NSBox : NSView {} - (NSBoxType)boxType; @end
+@class NSArray, NSError, NSImage, NSView, NSNotificationCenter, NSURL;
+@interface NSProBox:NSBox {} @end
+enum IBKnobPosition { IBNoKnobPosition = -1, IBBottomLeftKnobPosition = 0, 
+                      IBMiddleLeftKnobPosition, IBTopLeftKnobPosition,
+                      IBTopMiddleKnobPosition, IBTopRightKnobPosition,
+                      IBMiddleRightKnobPosition, IBBottomRightKnobPosition, 
+                      IBBottomMiddleKnobPosition };
+typedef enum IBKnobPosition IBKnobPosition;
+typedef struct _IBInset {} IBInset;
+@protocol IBObjectProtocol -(NSString *)inspectorClassName; @end
+@protocol IBViewProtocol
+  -(NSSize)minimumFrameSizeFromKnobPosition:(IBKnobPosition)position;
+  -(IBInset)ibShadowInset;
+@end
+@class NSPasteboard;
+@interface NSObject (NSObject_IBObjectProtocol) <IBObjectProtocol> @end
+@interface NSView (NSView_IBViewProtocol) <IBViewProtocol>  - (NSRect)layoutRect; @end
+typedef enum { NSProTextFieldSquareBezel = 0, NSProTextFieldRoundedBezel = 1, NSProTextFieldDisplayBezel = 2 } MKModuleReusePolicy;
+@implementation NSProBox(IBAdditions)
+-(NSString *)inspectorClassName {}
+-(IBInset)ibShadowInset {
+  if ([self boxType] == NSBoxSeparator) {
+    return [super ibShadowInset];
+  }
+}
+-(NSSize)minimumFrameSizeFromKnobPosition:(IBKnobPosition)knobPosition {
+  if ([self boxType] != NSBoxSeparator)
+    return [super minimumFrameSizeFromKnobPosition:knobPosition];
+}
+@end