Obj-C: Fix assert-on-invalid (PR27822)

Clang would assert when isObjCInstancetype() was called on a
tok::annot_cxxscope token.

llvm-svn: 271688

clang/include/clang/Parse/Parser.h

@@ -647,6 +647,8 @@ private:
   /// Should only be used in Objective-C language modes.
   bool isObjCInstancetype() {
     assert(getLangOpts().ObjC1);
+    if (Tok.isAnnotation())
+      return false;
     if (!Ident_instancetype)
       Ident_instancetype = PP.getIdentifierInfo("instancetype");
     return Tok.getIdentifierInfo() == Ident_instancetype;

clang/test/SemaObjCXX/instancetype.mm

@@ -214,3 +214,10 @@ void test_instancetype_inherited() {
   return 0;
 }
 @end
+
+// PR27822
+@class NSString;
+namespace pr27822 { }
+@interface AXPlatformNodeCocoa
++ (NSString*)nativeRoleFromAXRole:(pr27822::UndeclaredIdentifier)role; // expected-error {{expected a type}}
+@end