text: // RUN: %clang_cc1 %s -fsyntax-only -verify
  // rdar://8632525
  
  typedef struct objc_class *Class;
  typedef struct objc_object {
      Class isa;
  } *id;
  
  
  typedef struct objc_selector *SEL;
  extern id objc_msgSend(id self, SEL op, ...);
  
  