Index: cfe/trunk/lib/Sema/SemaDeclAttr.cpp
===================================================================
--- cfe/trunk/lib/Sema/SemaDeclAttr.cpp
+++ cfe/trunk/lib/Sema/SemaDeclAttr.cpp
@@ -7258,6 +7258,12 @@
 
   bool TraverseLambdaExpr(LambdaExpr *E) { return true; }
 
+  bool VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *PRE) {
+    if (PRE->isClassReceiver())
+      DiagnoseDeclAvailability(PRE->getClassReceiver(), PRE->getReceiverLocation());
+    return true;
+  }
+
   bool VisitObjCMessageExpr(ObjCMessageExpr *Msg) {
     if (ObjCMethodDecl *D = Msg->getMethodDecl())
       DiagnoseDeclAvailability(
@@ -7387,6 +7393,9 @@
   const Type *TyPtr = Ty.getTypePtr();
   SourceRange Range{Ty.getBeginLoc(), Ty.getEndLoc()};
 
+  if (Range.isInvalid())
+    return true;
+
   if (const TagType *TT = dyn_cast<TagType>(TyPtr)) {
     TagDecl *TD = TT->getDecl();
     DiagnoseDeclAvailability(TD, Range);
Index: cfe/trunk/test/SemaObjC/unguarded-availability.m
===================================================================
--- cfe/trunk/test/SemaObjC/unguarded-availability.m
+++ cfe/trunk/test/SemaObjC/unguarded-availability.m
@@ -135,6 +135,26 @@
     func_10_12();
 };
 
+AVAILABLE_10_12
+__attribute__((objc_root_class))
+@interface InterWithProp // expected-note 2 {{marked partial here}}
+@property(class) int x;
++ (void) setX: (int)newX AVAILABLE_10_12; // expected-note{{marked partial here}}
+@end
+void test_property(void) {
+  int y = InterWithProp.x; // expected-warning{{'InterWithProp' is only available on macOS 10.12 or newer}} expected-note{{@available}}
+  InterWithProp.x = y; // expected-warning{{'InterWithProp' is only available on macOS 10.12 or newer}} expected-note{{@available}} expected-warning{{'setX:' is only available on macOS 10.12 or newer}} expected-note{{@available}}
+}
+
+__attribute__((objc_root_class))
+@interface Subscriptable
+- (id)objectAtIndexedSubscript:(int)sub AVAILABLE_10_12; // expected-note{{marked partial here}}
+@end
+
+void test_at(Subscriptable *x) {
+  id y = x[42]; // expected-warning{{'objectAtIndexedSubscript:' is only available on macOS 10.12 or newer}} expected-note{{@available}}
+}
+
 #ifdef OBJCPP
 
 int f(char) AVAILABLE_10_12;