r375125 - [ObjC] Diagnose implicit type coercion from ObjC 'Class' to object
James Y Knight via cfe-commits
cfe-commits at lists.llvm.org
Thu Oct 17 08:27:05 PDT 2019
Author: jyknight
Date: Thu Oct 17 08:27:04 2019
New Revision: 375125
URL: http://llvm.org/viewvc/llvm-project?rev=375125&view=rev
Log:
[ObjC] Diagnose implicit type coercion from ObjC 'Class' to object
pointer types.
For example, in Objective-C mode, the initialization of 'x' in:
```
@implementation MyType
+ (void)someClassMethod {
MyType *x = self;
}
@end
```
is correctly diagnosed with an incompatible-pointer-types warning, but
in Objective-C++ mode, it is not diagnosed at all -- even though
incompatible pointer conversions generally become an error in C++.
This patch fixes that oversight, allowing implicit conversions
involving Class only to/from unqualified-id, and between qualified and
unqualified Class, where the protocols are compatible.
Note that this does change some behaviors in Objective-C, as well, as
shown by the modified tests.
Of particular note is that assignment from from 'Class<MyProtocol>' to
'id<MyProtocol>' now warns. (Despite appearances, those are not
compatible types. 'Class<MyProtocol>' is not expected to have instance
methods defined by 'MyProtocol', while 'id<MyProtocol>' is.)
Differential Revision: https://reviews.llvm.org/D67983
Modified:
cfe/trunk/lib/AST/ASTContext.cpp
cfe/trunk/lib/Sema/SemaExpr.cpp
cfe/trunk/test/SemaObjC/comptypes-1.m
cfe/trunk/test/SemaObjCXX/class-method-self.mm
cfe/trunk/test/SemaObjCXX/comptypes-1.mm
cfe/trunk/test/SemaObjCXX/comptypes-7.mm
cfe/trunk/test/SemaObjCXX/instancetype.mm
Modified: cfe/trunk/lib/AST/ASTContext.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/ASTContext.cpp?rev=375125&r1=375124&r2=375125&view=diff
==============================================================================
--- cfe/trunk/lib/AST/ASTContext.cpp (original)
+++ cfe/trunk/lib/AST/ASTContext.cpp Thu Oct 17 08:27:04 2019
@@ -8025,14 +8025,15 @@ bool ASTContext::ObjCQualifiedClassTypes
bool ASTContext::ObjCQualifiedIdTypesAreCompatible(
const ObjCObjectPointerType *lhs, const ObjCObjectPointerType *rhs,
bool compare) {
- // Allow id<P..> and an 'id' or void* type in all cases.
- if (lhs->isVoidPointerType() ||
- lhs->isObjCIdType() || lhs->isObjCClassType())
- return true;
- else if (rhs->isVoidPointerType() ||
- rhs->isObjCIdType() || rhs->isObjCClassType())
+ // Allow id<P..> and an 'id' in all cases.
+ if (lhs->isObjCIdType() || rhs->isObjCIdType())
return true;
+ // Don't allow id<P..> to convert to Class or Class<P..> in either direction.
+ if (lhs->isObjCClassType() || lhs->isObjCQualifiedClassType() ||
+ rhs->isObjCClassType() || rhs->isObjCQualifiedClassType())
+ return false;
+
if (lhs->isObjCQualifiedIdType()) {
if (rhs->qual_empty()) {
// If the RHS is a unqualified interface pointer "NSString*",
@@ -8142,9 +8143,8 @@ bool ASTContext::canAssignObjCInterfaces
const ObjCObjectType* LHS = LHSOPT->getObjectType();
const ObjCObjectType* RHS = RHSOPT->getObjectType();
- // If either type represents the built-in 'id' or 'Class' types, return true.
- if (LHS->isObjCUnqualifiedIdOrClass() ||
- RHS->isObjCUnqualifiedIdOrClass())
+ // If either type represents the built-in 'id' type, return true.
+ if (LHS->isObjCUnqualifiedId() || RHS->isObjCUnqualifiedId())
return true;
// Function object that propagates a successful result or handles
@@ -8162,14 +8162,22 @@ bool ASTContext::canAssignObjCInterfaces
LHSOPT->stripObjCKindOfTypeAndQuals(*this));
};
+ // Casts from or to id<P> are allowed when the other side has compatible
+ // protocols.
if (LHS->isObjCQualifiedId() || RHS->isObjCQualifiedId()) {
return finish(ObjCQualifiedIdTypesAreCompatible(LHSOPT, RHSOPT, false));
}
+ // Verify protocol compatibility for casts from Class<P1> to Class<P2>.
if (LHS->isObjCQualifiedClass() && RHS->isObjCQualifiedClass()) {
return finish(ObjCQualifiedClassTypesAreCompatible(LHSOPT, RHSOPT));
}
+ // Casts from Class to Class<Foo>, or vice-versa, are allowed.
+ if (LHS->isObjCClass() && RHS->isObjCClass()) {
+ return true;
+ }
+
// If we have 2 user-defined types, fall into that path.
if (LHS->getInterface() && RHS->getInterface()) {
return finish(canAssignObjCInterfaces(LHS, RHS));
Modified: cfe/trunk/lib/Sema/SemaExpr.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaExpr.cpp?rev=375125&r1=375124&r2=375125&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaExpr.cpp (original)
+++ cfe/trunk/lib/Sema/SemaExpr.cpp Thu Oct 17 08:27:04 2019
@@ -10068,8 +10068,8 @@ static bool convertPointersToCompositeTy
QualType T = S.FindCompositePointerType(Loc, LHS, RHS);
if (T.isNull()) {
- if ((LHSType->isPointerType() || LHSType->isMemberPointerType()) &&
- (RHSType->isPointerType() || RHSType->isMemberPointerType()))
+ if ((LHSType->isAnyPointerType() || LHSType->isMemberPointerType()) &&
+ (RHSType->isAnyPointerType() || RHSType->isMemberPointerType()))
diagnoseDistinctPointerComparison(S, Loc, LHS, RHS, /*isError*/true);
else
S.InvalidOperands(Loc, LHS, RHS);
Modified: cfe/trunk/test/SemaObjC/comptypes-1.m
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjC/comptypes-1.m?rev=375125&r1=375124&r2=375125&view=diff
==============================================================================
--- cfe/trunk/test/SemaObjC/comptypes-1.m (original)
+++ cfe/trunk/test/SemaObjC/comptypes-1.m Thu Oct 17 08:27:04 2019
@@ -49,7 +49,7 @@ int main()
obj_p = obj_c; // expected-warning {{assigning to 'id<MyProtocol>' from incompatible type 'MyClass *'}}
obj_p = obj_cp; /* Ok */
obj_p = obj_C; // expected-warning {{incompatible pointer types assigning to 'id<MyProtocol>' from 'Class'}}
- obj_p = obj_CP; // FIXME -- should warn {{assigning to 'id<MyProtocol>' from incompatible type 'Class<MyProtocol>'}}
+ obj_p = obj_CP; // expected-warning {{assigning to 'id<MyProtocol>' from incompatible type 'Class<MyProtocol>'}}
/* Assigning to a 'MyOtherClass *' variable should always generate
a warning, unless done from an 'id' or an 'id<MyProtocol>' (since
@@ -92,8 +92,8 @@ int main()
if (obj_c == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'MyOtherClass *')}}
if (obj_cp == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'MyClass *')}}
- if (obj_c == obj_C) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('MyClass *' and 'Class')}}
- if (obj_C == obj_c) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('Class' and 'MyClass *')}}
+ if (obj_c == obj_C) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'Class')}}
+ if (obj_C == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('Class' and 'MyClass *')}}
if (obj_c == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'Class<MyProtocol>')}}
if (obj_CP == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'MyClass *')}}
@@ -103,15 +103,15 @@ int main()
if (obj_p == obj_cp) foo(); /* Ok */
if (obj_cp == obj_p) foo(); /* Ok */
- if (obj_p == obj_C) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class')}}
- if (obj_C == obj_p) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('Class' and 'id<MyProtocol>')}}
+ if (obj_p == obj_C) foo(); // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class')}}
+ if (obj_C == obj_p) foo(); // expected-warning {{comparison of distinct pointer types ('Class' and 'id<MyProtocol>')}}
- if (obj_p == obj_CP) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class<MyProtocol>')}}
- if (obj_CP == obj_p) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('Class<MyProtocol>' and 'id<MyProtocol>')}}
+ if (obj_p == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class<MyProtocol>')}}
+ if (obj_CP == obj_p) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'id<MyProtocol>')}}
/* Comparisons between MyOtherClass * and Class types is a warning */
- if (obj_cp == obj_C) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('MyOtherClass *' and 'Class')}}
- if (obj_C == obj_cp) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('Class' and 'MyOtherClass *')}}
+ if (obj_cp == obj_C) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'Class')}}
+ if (obj_C == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('Class' and 'MyOtherClass *')}}
if (obj_cp == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'Class<MyProtocol>')}}
if (obj_CP == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'MyOtherClass *')}}
Modified: cfe/trunk/test/SemaObjCXX/class-method-self.mm
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjCXX/class-method-self.mm?rev=375125&r1=375124&r2=375125&view=diff
==============================================================================
--- cfe/trunk/test/SemaObjCXX/class-method-self.mm (original)
+++ cfe/trunk/test/SemaObjCXX/class-method-self.mm Thu Oct 17 08:27:04 2019
@@ -1,8 +1,8 @@
// RUN: %clang_cc1 -verify -Wno-objc-root-class %s
-// FIXME: expected-no-diagnostics
+
@interface XX
-- (void)addObserver:(XX*)o; // FIXME -- should note 2{{passing argument to parameter 'o' here}}
+- (void)addObserver:(XX*)o; // expected-note 2{{passing argument to parameter 'o' here}}
@end
@@ -17,9 +17,9 @@
static XX *obj;
+ (void)classMethod {
- [obj addObserver:self]; // FIXME -- should error {{cannot initialize a parameter of type 'XX *' with an lvalue of type 'Class'}}
+ [obj addObserver:self]; // expected-error {{cannot initialize a parameter of type 'XX *' with an lvalue of type 'Class'}}
Class whatever;
- [obj addObserver:whatever]; // FIXME -- should error {{cannot initialize a parameter of type 'XX *' with an lvalue of type 'Class'}}
+ [obj addObserver:whatever]; // expected-error {{cannot initialize a parameter of type 'XX *' with an lvalue of type 'Class'}}
}
@end
Modified: cfe/trunk/test/SemaObjCXX/comptypes-1.mm
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjCXX/comptypes-1.mm?rev=375125&r1=375124&r2=375125&view=diff
==============================================================================
--- cfe/trunk/test/SemaObjCXX/comptypes-1.mm (original)
+++ cfe/trunk/test/SemaObjCXX/comptypes-1.mm Thu Oct 17 08:27:04 2019
@@ -38,7 +38,7 @@ int main()
obj_c = obj; /* Ok */
obj_c = obj_p; // expected-error {{assigning to 'MyClass *' from incompatible type 'id<MyProtocol>'}}
obj_c = obj_cp; // expected-error {{assigning to 'MyClass *' from incompatible type 'MyOtherClass *'}}
- obj_c = obj_C; // FIXME -- should error {{assigning to 'MyClass *' from incompatible type 'Class'}}
+ obj_c = obj_C; // expected-error {{assigning to 'MyClass *' from incompatible type 'Class'}}
obj_c = obj_CP; // expected-error {{assigning to 'MyClass *' from incompatible type 'Class<MyProtocol>'}}
/* Assigning to an 'id<MyProtocol>' variable should generate a
@@ -48,8 +48,8 @@ int main()
obj_p = obj; /* Ok */
obj_p = obj_c; // expected-error {{assigning to 'id<MyProtocol>' from incompatible type 'MyClass *'}}
obj_p = obj_cp; /* Ok */
- obj_p = obj_C; // FIXME -- should error {{assigning to 'id<MyProtocol>' from incompatible type 'Class'}}
- obj_p = obj_CP; // FIXME -- should error {{assigning to 'id<MyProtocol>' from incompatible type 'Class<MyProtocol>'}}
+ obj_p = obj_C; // expected-error {{assigning to 'id<MyProtocol>' from incompatible type 'Class'}}
+ obj_p = obj_CP; // expected-error {{assigning to 'id<MyProtocol>' from incompatible type 'Class<MyProtocol>'}}
/* Assigning to a 'MyOtherClass *' variable should always generate
a warning, unless done from an 'id' or an 'id<MyProtocol>' (since
@@ -57,17 +57,17 @@ int main()
obj_cp = obj; /* Ok */
obj_cp = obj_c; // expected-error {{assigning to 'MyOtherClass *' from incompatible type 'MyClass *'}}
obj_cp = obj_p; /* Ok */
- obj_cp = obj_C; // FIXME -- should error {{assigning to 'MyOtherClass *' from incompatible type 'Class'}}
+ obj_cp = obj_C; // expected-error {{assigning to 'MyOtherClass *' from incompatible type 'Class'}}
obj_cp = obj_CP; // expected-error {{assigning to 'MyOtherClass *' from incompatible type 'Class<MyProtocol>'}}
obj_C = obj; // Ok
- obj_C = obj_p; // FIXME -- should error {{assigning to 'Class' from incompatible type 'id<MyProtocol>'}}
- obj_C = obj_c; // FIXME -- should error {{assigning to 'Class' from incompatible type 'MyClass *'}}
- obj_C = obj_cp; // FIXME -- should error {{assigning to 'Class' from incompatible type 'MyOtherClass *'}}
+ obj_C = obj_p; // expected-error {{assigning to 'Class' from incompatible type 'id<MyProtocol>'}}
+ obj_C = obj_c; // expected-error {{assigning to 'Class' from incompatible type 'MyClass *'}}
+ obj_C = obj_cp; // expected-error {{assigning to 'Class' from incompatible type 'MyOtherClass *'}}
obj_C = obj_CP; // Ok
obj_CP = obj; // Ok
- obj_CP = obj_p; // expected-warning {{incompatible pointer types assigning to 'Class<MyProtocol>' from 'id<MyProtocol>'}} FIXME -- should error {{assigning to 'Class<MyProtocol>' from incompatible type 'id<MyProtocol>'}}
+ obj_CP = obj_p; // expected-error {{assigning to 'Class<MyProtocol>' from incompatible type 'id<MyProtocol>'}}
obj_CP = obj_c; // expected-error {{assigning to 'Class<MyProtocol>' from incompatible type 'MyClass *}}
obj_CP = obj_cp; // expected-error {{assigning to 'Class<MyProtocol>' from incompatible type 'MyOtherClass *'}}
obj_CP = obj_C; // Ok
@@ -92,8 +92,8 @@ int main()
if (obj_c == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'MyOtherClass *')}}
if (obj_cp == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'MyClass *')}}
- if (obj_c == obj_C) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('MyClass *' and 'Class')}}
- if (obj_C == obj_c) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('Class' and 'MyClass *')}}
+ if (obj_c == obj_C) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'Class')}}
+ if (obj_C == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('Class' and 'MyClass *')}}
if (obj_c == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('MyClass *' and 'Class<MyProtocol>')}}
if (obj_CP == obj_c) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'MyClass *')}}
@@ -103,15 +103,15 @@ int main()
if (obj_p == obj_cp) foo(); /* Ok */
if (obj_cp == obj_p) foo(); /* Ok */
- if (obj_p == obj_C) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class')}}
- if (obj_C == obj_p) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('Class' and 'id<MyProtocol>')}}
+ if (obj_p == obj_C) foo(); // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class')}}
+ if (obj_C == obj_p) foo(); // expected-warning {{comparison of distinct pointer types ('Class' and 'id<MyProtocol>')}}
- if (obj_p == obj_CP) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class<MyProtocol>')}}
- if (obj_CP == obj_p) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('Class<MyProtocol>' and 'id<MyProtocol>')}}
+ if (obj_p == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('id<MyProtocol>' and 'Class<MyProtocol>')}}
+ if (obj_CP == obj_p) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'id<MyProtocol>')}}
/* Comparisons between MyOtherClass * and Class types is a warning */
- if (obj_cp == obj_C) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('MyOtherClass *' and 'Class')}}
- if (obj_C == obj_cp) foo(); // FIXME -- should warn {{comparison of distinct pointer types ('Class' and 'MyOtherClass *')}}
+ if (obj_cp == obj_C) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'Class')}}
+ if (obj_C == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('Class' and 'MyOtherClass *')}}
if (obj_cp == obj_CP) foo(); // expected-warning {{comparison of distinct pointer types ('MyOtherClass *' and 'Class<MyProtocol>')}}
if (obj_CP == obj_cp) foo(); // expected-warning {{comparison of distinct pointer types ('Class<MyProtocol>' and 'MyOtherClass *')}}
Modified: cfe/trunk/test/SemaObjCXX/comptypes-7.mm
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjCXX/comptypes-7.mm?rev=375125&r1=375124&r2=375125&view=diff
==============================================================================
--- cfe/trunk/test/SemaObjCXX/comptypes-7.mm (original)
+++ cfe/trunk/test/SemaObjCXX/comptypes-7.mm Thu Oct 17 08:27:04 2019
@@ -47,23 +47,23 @@ int main()
if (obj == i) foo() ; // expected-error {{comparison between pointer and integer ('id' and 'int')}}
if (i == obj) foo() ; // expected-error {{comparison between pointer and integer ('int' and 'id')}}
- if (obj == j) foo() ; // expected-error {{invalid operands to binary expression ('id' and 'int *')}}
- if (j == obj) foo() ; // expected-error {{invalid operands to binary expression ('int *' and 'id')}}
+ if (obj == j) foo() ; // expected-error {{comparison of distinct pointer types ('id' and 'int *')}}
+ if (j == obj) foo() ; // expected-error {{comparison of distinct pointer types ('int *' and 'id')}}
if (obj_c == i) foo() ; // expected-error {{comparison between pointer and integer ('MyClass *' and 'int')}}
if (i == obj_c) foo() ; // expected-error {{comparison between pointer and integer ('int' and 'MyClass *')}}
- if (obj_c == j) foo() ; // expected-error {{invalid operands to binary expression ('MyClass *' and 'int *')}}
- if (j == obj_c) foo() ; // expected-error {{invalid operands to binary expression ('int *' and 'MyClass *')}}
+ if (obj_c == j) foo() ; // expected-error {{comparison of distinct pointer types ('MyClass *' and 'int *')}}
+ if (j == obj_c) foo() ; // expected-error {{comparison of distinct pointer types ('int *' and 'MyClass *')}}
if (obj_p == i) foo() ; // expected-error {{comparison between pointer and integer ('id<MyProtocol>' and 'int')}}
if (i == obj_p) foo() ; // expected-error {{comparison between pointer and integer ('int' and 'id<MyProtocol>')}}
- if (obj_p == j) foo() ; // expected-error {{invalid operands to binary expression ('id<MyProtocol>' and 'int *')}}
- if (j == obj_p) foo() ; // expected-error {{invalid operands to binary expression ('int *' and 'id<MyProtocol>')}}
+ if (obj_p == j) foo() ; // expected-error {{comparison of distinct pointer types ('id<MyProtocol>' and 'int *')}}
+ if (j == obj_p) foo() ; // expected-error {{comparison of distinct pointer types ('int *' and 'id<MyProtocol>')}}
if (obj_C == i) foo() ; // expected-error {{comparison between pointer and integer ('Class' and 'int')}}
if (i == obj_C) foo() ; // expected-error {{comparison between pointer and integer ('int' and 'Class')}}
- if (obj_C == j) foo() ; // expected-error {{invalid operands to binary expression ('Class' and 'int *')}}
- if (j == obj_C) foo() ; // expected-error {{invalid operands to binary expression ('int *' and 'Class')}}
+ if (obj_C == j) foo() ; // expected-error {{comparison of distinct pointer types ('Class' and 'int *')}}
+ if (j == obj_C) foo() ; // expected-error {{comparison of distinct pointer types ('int *' and 'Class')}}
Class bar1 = nil;
Class <MyProtocol> bar = nil;
Modified: cfe/trunk/test/SemaObjCXX/instancetype.mm
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjCXX/instancetype.mm?rev=375125&r1=375124&r2=375125&view=diff
==============================================================================
--- cfe/trunk/test/SemaObjCXX/instancetype.mm (original)
+++ cfe/trunk/test/SemaObjCXX/instancetype.mm Thu Oct 17 08:27:04 2019
@@ -5,7 +5,7 @@
#endif
@interface Root
-+ (instancetype)alloc; // FIXME -- should note {{explicitly declared 'instancetype'}}
++ (instancetype)alloc; // expected-note {{explicitly declared 'instancetype'}}
- (instancetype)init; // expected-note{{overridden method is part of the 'init' method family}}
- (instancetype)self; // expected-note {{explicitly declared 'instancetype'}}
- (Class)class;
@@ -143,7 +143,7 @@ void test_instancetype_narrow_method_sea
@implementation Subclass4
+ (id)alloc {
- return self; // FIXME -- should error{{cannot initialize return object of type 'Subclass4 *' with an lvalue of type 'Class'}}
+ return self; // expected-error{{cannot initialize return object of type 'Subclass4 *' with an lvalue of type 'Class'}}
}
- (Subclass3 *)init { return 0; } // don't complain: we lost the related return type
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