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1// RUN: %clang_cc1 -fsyntax-only -verify -Wno-objc-root-class %s2 3@interface PBXTrackableTaskManager @end4@implementation PBXTrackableTaskManager @end5 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