1// RUN: %clang_cc1 -fsyntax-only -verify -Wno-objc-root-class %s 2 3@interface PBXTrackableTaskManager @end 4@implementation PBXTrackableTaskManager @end 5 6struct x { 7 operator PBXTrackableTaskManager *() const { return 0; } 8} a; 9 10struct y { 11 operator int *() const { return 0; } 12} b; 13 14void test1() { 15 @synchronized (a) { 16 } 17 18 @synchronized (b) { // expected-error {{@synchronized requires an Objective-C object type ('struct y' invalid)}} 19 } 20} 21