Allow @NSManaged to be applied to methods.

Core Data synthesizes Key-Value-Coding-compliant accessors for @NSManaged
properties, but Swift won't allow them to be called without predeclaring
them.

In practice, '@NSManaged' on a method is the same as 'dynamic', except
you /can't/ provide a body and overriding it won't work. This is not the
long-term model we want (see rdar://problem/20829214), but it fixes a
short-term issue with an unfortunate workaround (go through
mutableOrderedSetValueForKey(_:) and similar methods).

rdar://problem/17583057

Swift SVN r30523

include/swift/AST/Attr.def

@@ -122,7 +122,7 @@ SIMPLE_DECL_ATTR(IBInspectable, IBInspectable,
 SIMPLE_DECL_ATTR(IBOutlet, IBOutlet,
                  OnVar, 14)
 
-SIMPLE_DECL_ATTR(NSManaged, NSManaged, OnVar, 15)
+SIMPLE_DECL_ATTR(NSManaged, NSManaged, OnVar | OnFunc, 15)
 
 SIMPLE_DECL_ATTR(lazy, Lazy, OnVar|DeclModifier, 16)
 

include/swift/AST/DiagnosticsSema.def

@@ -1302,8 +1302,8 @@ ERROR(noescape_conflicts_escaping_autoclosure,attribute_parsing,none,
 
 
 // NSManaged attribute
-ERROR(attr_NSManaged_not_property,sema_tcd,none,
-      "@NSManaged only allowed on a property in a class", ())
+ERROR(attr_NSManaged_not_instance_member,sema_tcd,none,
+      "@NSManaged only allowed on an instance property or method", ())
 ERROR(attr_NSManaged_not_stored,sema_tcd,none,
       "@NSManaged not allowed on %select{computed|observing|adressed}0 "
       "properties", (unsigned))
@@ -1313,6 +1313,8 @@ ERROR(attr_NSManaged_initial_value,sema_tcd,none,
       "@NSManaged property cannot have an initial value", ())
 ERROR(attr_NSManaged_NSCopying,sema_tcd,none,
       "@NSManaged property cannot also be marked @NSCopying", ())
+ERROR(attr_NSManaged_method_body,sema_tcd,none,
+      "@NSManaged method cannot have a body; it must be provided at runtime",())
 
 
 // NSCopying attribute

include/swift/Serialization/ModuleFormat.h

@@ -51,7 +51,7 @@ const uint16_t VERSION_MAJOR = 0;
 /// To ensure that two separate changes don't silently get merged into one
 /// in source control, you should also update the comment to briefly
 /// describe what change you made.
-const uint16_t VERSION_MINOR = 206; // Last change: add reabstraction_thunk type
+const uint16_t VERSION_MINOR = 207; // Last change: @NSManaged on methods
 
 using DeclID = Fixnum<31>;
 using DeclIDField = BCFixed<31>;

lib/IRGen/ClassMetadataLayout.h

@@ -110,12 +110,17 @@ private:
         if (VD->isFinal() && VD->getOverriddenDecl() == nullptr)
           continue;
 
+      // @NSManaged properties and methods don't have vtable entries.
+      if (member->getAttrs().hasAttribute<NSManagedAttr>())
+        continue;
+
       // Add entries for methods.
       if (auto fn = dyn_cast<FuncDecl>(member)) {
         // Ignore accessors.  These get added when their AbstractStorageDecl is
         // visited.
         if (fn->isAccessor())
           continue;
+
         addMethodEntries(fn);
       } else if (auto ctor = dyn_cast<ConstructorDecl>(member)) {
         // Stub constructors don't get an entry.
@@ -128,9 +133,6 @@ private:
         // FIXME: Stored properties should either be final or have accessors.
         if (!asd->hasAccessorFunctions()) continue;
 
-        // @NSManaged properties don't have vtable entries.
-        if (asd->getAttrs().hasAttribute<NSManagedAttr>()) continue;
-
         addMethodEntries(asd->getGetter());
         if (auto *setter = asd->getSetter())
           addMethodEntries(setter);

lib/IRGen/GenClass.cpp

@@ -1153,6 +1153,10 @@ namespace {
       // var/subscript.
       if (method->isAccessor()) return;
 
+      // Don't emit getters/setters for @NSManaged methods.
+      if (method->getAttrs().hasAttribute<NSManagedAttr>())
+        return;
+
       llvm::Constant *entry = emitObjCMethodDescriptor(IGM, method);
       // This pointer will be set if we need to store the extended method type
       // encoding.
@@ -1480,7 +1484,7 @@ namespace {
           if (llvm::Constant *prop = buildProperty(var))
             Properties.push_back(prop);
 
-        // Don't emit getter/setter descriptors for @NSManagedAttr properties.
+        // Don't emit getter/setter descriptors for @NSManaged properties.
         if (var->getAttrs().hasAttribute<NSManagedAttr>() ||
             // Don't emit descriptors for properties without accessors.
             var->getGetter() == nullptr)

lib/IRGen/GenDecl.cpp

@@ -146,6 +146,11 @@ public:
   
   void visitFuncDecl(FuncDecl *method) {
     if (!requiresObjCMethodDescriptor(method)) return;
+
+    // Don't emit getters/setters for @NSManaged methods.
+    if (method->getAttrs().hasAttribute<NSManagedAttr>())
+      return;
+
     llvm::Constant *name, *imp, *types;
     emitObjCMethodDescriptorParts(IGM, method,
                                   /*extended*/false,
@@ -203,7 +208,7 @@ public:
     // ObjC doesn't have a notion of class properties, so we'd only do this
     // for instance properties.
 
-    // Don't emit getters/setters for @NSManagedAttr properties.
+    // Don't emit getters/setters for @NSManaged properties.
     if (prop->getAttrs().hasAttribute<NSManagedAttr>())
       return;
 

lib/SILGen/SILGenType.cpp

@@ -173,12 +173,15 @@ SILValue SILGenFunction::emitDynamicMethodRef(SILLocation loc,
 
 bool SILGenModule::requiresObjCMethodEntryPoint(FuncDecl *method) {
   // Property accessors should be generated alongside the property unless
-  // the @NSManagedAttr attribute is present.
+  // the @NSManaged attribute is present.
   if (method->isGetterOrSetter()) {
     auto asd = method->getAccessorStorageDecl();
     return asd->isObjC() && !asd->getAttrs().hasAttribute<NSManagedAttr>();
   }
 
+  if (method->getAttrs().hasAttribute<NSManagedAttr>())
+    return false;
+
   return method->isObjC() || method->getAttrs().hasAttribute<IBActionAttr>();
 }
 

lib/Sema/TypeCheckAttr.cpp

@@ -333,12 +333,23 @@ void AttributeEarlyChecker::visitIBOutletAttr(IBOutletAttr *attr) {
 }
 
 void AttributeEarlyChecker::visitNSManagedAttr(NSManagedAttr *attr) {
-  // @NSManaged may only be used on properties.
-  auto *VD = cast<VarDecl>(D);
+  // @NSManaged only applies to instance methods and properties within a class.
+  if (cast<ValueDecl>(D)->isStatic() ||
+      !D->getDeclContext()->isClassOrClassExtensionContext()) {
+    return diagnoseAndRemoveAttr(attr,
+                                 diag::attr_NSManaged_not_instance_member);
+  }
 
-  // NSManaged only applies to non-class properties within a class.
-  if (VD->isStatic() || !VD->getDeclContext()->isClassOrClassExtensionContext())
-    return diagnoseAndRemoveAttr(attr, diag::attr_NSManaged_not_property);
+  if (auto *method = dyn_cast<FuncDecl>(D)) {
+    // Separate out the checks for methods.
+    if (method->hasBody())
+      return diagnoseAndRemoveAttr(attr, diag::attr_NSManaged_method_body);
+
+    return;
+  }
+
+  // Everything below deals with restrictions on @NSManaged properties.
+  auto *VD = cast<VarDecl>(D);
 
   if (VD->isLet())
     return diagnoseAndRemoveAttr(attr, diag::attr_NSManaged_let_property);

lib/Sema/TypeCheckDecl.cpp

@@ -3903,10 +3903,11 @@ public:
     if (decl->isInvalid() || decl->isImplicit() || decl->hasClangNode())
       return false;
 
-    // Functions can have asmname and semantics attributes.
+    // Functions can have asmname, semantics, and NSManaged attributes.
     if (auto func = dyn_cast<AbstractFunctionDecl>(decl)) {
       if (func->getAttrs().hasAttribute<AsmnameAttr>() ||
-          func->getAttrs().hasAttribute<SemanticsAttr>())
+          func->getAttrs().hasAttribute<SemanticsAttr>() ||
+          func->getAttrs().hasAttribute<NSManagedAttr>())
         return false;
     }
 
@@ -4158,28 +4159,7 @@ public:
     validateAttributes(TC, FD);
 
     // Member functions need some special validation logic.
-    if (auto contextType = FD->getDeclContext()->getDeclaredTypeInContext()) {
-      // If this is a class member, mark it final if the class is final.
-      if (auto cls = contextType->getClassOrBoundGenericClass()) {
-        if (cls->isFinal() && !FD->isAccessor() &&
-            !FD->isFinal() && !FD->isDynamic()) {
-          makeFinal(TC.Context, FD);
-        }
-        // static func declarations in classes are synonyms
-        // for `class final func` declarations.
-        if (FD->getStaticSpelling() == StaticSpellingKind::KeywordStatic) {
-          auto finalAttr = FD->getAttrs().getAttribute<FinalAttr>();
-          if (finalAttr) {
-            auto finalRange = finalAttr->getRange();
-            if (finalRange.isValid())
-              TC.diagnose(finalRange.Start, diag::decl_already_final)
-                .highlight(finalRange)
-                .fixItRemove(finalRange);
-          }
-          makeFinal(TC.Context, FD);
-        }
-      }
-
+    if (FD->getDeclContext()->isTypeContext()) {
       if (!checkOverrides(TC, FD)) {
         // If a method has an 'override' keyword but does not
         // override anything, complain.
@@ -4239,6 +4219,29 @@ public:
 
     TC.checkDeclAttributes(FD);
 
+    // If this is a class member, mark it final if the class is final.
+    if (auto contextType = FD->getDeclContext()->getDeclaredTypeInContext()) {
+      if (auto cls = contextType->getClassOrBoundGenericClass()) {
+        if (cls->isFinal() && !FD->isAccessor() &&
+            !FD->isFinal() && !FD->isDynamic()) {
+          makeFinal(TC.Context, FD);
+        }
+        // static func declarations in classes are synonyms
+        // for `class final func` declarations.
+        if (FD->getStaticSpelling() == StaticSpellingKind::KeywordStatic) {
+          auto finalAttr = FD->getAttrs().getAttribute<FinalAttr>();
+          if (finalAttr) {
+            auto finalRange = finalAttr->getRange();
+            if (finalRange.isValid())
+              TC.diagnose(finalRange.Start, diag::decl_already_final)
+              .highlight(finalRange)
+              .fixItRemove(finalRange);
+          }
+          makeFinal(TC.Context, FD);
+        }
+      }
+    }
+
     // Check whether we have parameters with default arguments that follow a
     // closure parameter; warn about such things, because the closure will not
     // be treated as a trailing closure.

test/ClangModules/Inputs/objc_nsmanaged_other.swift

@@ -11,4 +11,6 @@ func getMyManagedObject() -> MyManagedObject {
 
 extension MyManagedObject {
   @NSManaged var anotherManaged: String
+
+  @NSManaged func managedMethod()
 }

test/ClangModules/objc_nsmanagedobject.swift

@@ -53,3 +53,7 @@ func accessOther(om: OtherManagedObject) -> String {
 func accessMine(obj: MyManagedObject) -> String {
   return obj.anotherManaged
 }
+
+func accessMyMethod(obj: MyManagedObject) {
+  obj.managedMethod()
+}

test/IDE/complete_decl_attribute.swift

@@ -45,11 +45,12 @@ func method(@#^KEYWORD1^#) {}
 @#^KEYWORD2^#
 func method(){}
 
-// KEYWORD2:                  Begin completions, 8 items
+// KEYWORD2:                  Begin completions, 9 items
 // KEYWORD2-NEXT:             Keyword/None:                       available[#Func Attribute#]; name=available{{$}}
 // KEYWORD2-NEXT:             Keyword/None:                       objc[#Func Attribute#]; name=objc{{$}}
 // KEYWORD2-NEXT:             Keyword/None:                       noreturn[#Func Attribute#]; name=noreturn{{$}}
 // KEYWORD2-NEXT:             Keyword/None:                       IBAction[#Func Attribute#]; name=IBAction{{$}}
+// KEYWORD2-NEXT:             Keyword/None:                       NSManaged[#Func Attribute#]; name=NSManaged{{$}}
 // KEYWORD2-NEXT:             Keyword/None:                       inline[#Func Attribute#]; name=inline{{$}}
 // KEYWORD2-NEXT:             Keyword/None:                       nonobjc[#Func Attribute#]; name=nonobjc{{$}}
 // KEYWORD2-NEXT:             Keyword/None:                       warn_unused_result[#Func Attribute#]; name=warn_unused_result{{$}}

test/IRGen/objc_attr_NSManaged.sil

@@ -31,6 +31,7 @@ sil_vtable X {}
 
 @objc class SwiftGizmo : Gizmo {
   @objc @NSManaged var x: X
+  @objc @NSManaged func kvc()
 }
 sil @_TToFC19objc_attr_NSManaged1XcfMS0_FT_S0_ : $@convention(objc_method) (@owned X) -> @owned X {
 bb0(%0 : $X):

test/SILGen/objc_attr_NSManaged.swift

@@ -14,8 +14,11 @@ import gizmo
 class SwiftGizmo : Gizmo {
   @NSManaged var x: X
 
-  // CHECK-NOT: sil hidden @_TToFC19objc_attr_NSManaged10SwiftGizmog1xCS_1X : $@convention(objc_method) (SwiftGizmo) -> @autoreleased X
-  // CHECK-NOT: sil hidden @_TToFC19objc_attr_NSManaged10SwiftGizmos1xCS_1X
+  @NSManaged func kvc()
+
+  // CHECK-NOT: sil hidden @_TToFC19objc_attr_NSManaged10SwiftGizmog1x
+  // CHECK-NOT: sil hidden @_TToFC19objc_attr_NSManaged10SwiftGizmos1x
+  // CHECK-NOT: sil hidden @_TToFC19objc_attr_NSManaged10SwiftGizmo3kvc
 
   // Make sure that we're calling through the @objc entry points.
   // CHECK-LABEL: sil hidden @_TFC19objc_attr_NSManaged10SwiftGizmo7modifyX{{.*}} : $@convention(method) (@guaranteed SwiftGizmo) -> () {
@@ -28,16 +31,50 @@ class SwiftGizmo : Gizmo {
     x = x.foo()
     // CHECK: return
   }
+
+  // CHECK-LABEL: sil hidden @_TFC19objc_attr_NSManaged10SwiftGizmo8testFuncfS0_FT_T_
+  func testFunc() {
+    // CHECK: = class_method [volatile] %0 : $SwiftGizmo, #SwiftGizmo.kvc!1.foreign : SwiftGizmo -> () -> () , $@convention(objc_method) (SwiftGizmo) -> ()
+    // CHECK: return
+    kvc()
+  }
+}
+
+extension SwiftGizmo {
+  @NSManaged func extKVC()
+
+  // CHECK-LABEL: _TFC19objc_attr_NSManaged10SwiftGizmo7testExtfS0_FT_T_
+  func testExt() {
+    // CHECK: = class_method [volatile] %0 : $SwiftGizmo, #SwiftGizmo.extKVC!1.foreign : SwiftGizmo -> () -> () , $@convention(objc_method) (SwiftGizmo) -> ()
+    // CHECK: return
+    extKVC()
+  }
 }
 
 final class FinalGizmo : SwiftGizmo {
   @NSManaged var y: String
+
+  @NSManaged func kvc2()
+}
+
+extension FinalGizmo {
+  @NSManaged func extKVC2()
+
+  // CHECK-LABEL: _TFC19objc_attr_NSManaged10FinalGizmo8testExt2fS0_FT_T_
+  func testExt2() {
+    // CHECK: = class_method [volatile] %0 : $FinalGizmo, #FinalGizmo.extKVC2!1.foreign : FinalGizmo -> () -> () , $@convention(objc_method) (FinalGizmo) -> ()
+    // CHECK: return
+    extKVC2()
+  }
 }
 
 // CHECK-LABEL: sil hidden @_TF19objc_attr_NSManaged9testFinalFCS_10FinalGizmoSS : $@convention(thin) (@owned FinalGizmo) -> @owned String {
 func testFinal(obj: FinalGizmo) -> String {
+  // CHECK: class_method [volatile] %0 : $FinalGizmo, #FinalGizmo.kvc2!1.foreign : FinalGizmo -> () -> () , $@convention(objc_method) (FinalGizmo) -> ()
+  // CHECK-NOT: return
   // CHECK: class_method [volatile] %0 : $FinalGizmo, #FinalGizmo.y!getter.1.foreign : FinalGizmo -> () -> String , $@convention(objc_method) (FinalGizmo) -> @autoreleased NSString
   // CHECK: return
+  obj.kvc2()
   return obj.y
 }
 
@@ -50,13 +87,15 @@ func testFinal(obj: FinalGizmo) -> String {
 // The vtable should not contain any entry points for getters and setters.
 // CHECK-LABEL: sil_vtable SwiftGizmo {
 // CHECK-NEXT: #SwiftGizmo.modifyX!1: _TFC19objc_attr_NSManaged10SwiftGizmo7modifyXfS0_FT_T_ // objc_attr_NSManaged.SwiftGizmo.modifyX (objc_attr_NSManaged.SwiftGizmo)() -> ()
-// CHECK-NEXT:  #SwiftGizmo.deinit!deallocator:
+// CHECK-NEXT: #SwiftGizmo.testFunc!1: _TFC19objc_attr_NSManaged10SwiftGizmo8testFuncfS0_FT_T_ // objc_attr_NSManaged.SwiftGizmo.testFunc (objc_attr_NSManaged.SwiftGizmo)() -> ()
 // CHECK-NEXT:  #SwiftGizmo.init!initializer.1: _TFC19objc_attr_NSManaged10SwiftGizmocfMS0_FT_GSQS0__
 // CHECK-NEXT:   #SwiftGizmo.init!initializer.1: _TFC19objc_attr_NSManaged10SwiftGizmocfMS0_FT7bellsOnSi_GSQS0__
+// CHECK-NEXT:  #SwiftGizmo.deinit!deallocator:
 // CHECK-NEXT: }
 
 // CHECK-LABEL: sil_vtable FinalGizmo {
 // CHECK-NEXT:   #SwiftGizmo.modifyX!1: _TFC19objc_attr_NSManaged10SwiftGizmo7modifyXfS0_FT_T_
+// CHECK-NEXT: #SwiftGizmo.testFunc!1: _TFC19objc_attr_NSManaged10SwiftGizmo8testFuncfS0_FT_T_ // objc_attr_NSManaged.SwiftGizmo.testFunc (objc_attr_NSManaged.SwiftGizmo)() -> ()
 // CHECK-NEXT:   #SwiftGizmo.init!initializer.1: _TFC19objc_attr_NSManaged10FinalGizmocfMS0_FT_GSQS0__
 // CHECK-NEXT:   #SwiftGizmo.init!initializer.1: _TFC19objc_attr_NSManaged10FinalGizmocfMS0_FT7bellsOnSi_GSQS0__
 // CHECK-NEXT:   #FinalGizmo.deinit!deallocator: _TFC19objc_attr_NSManaged10FinalGizmoD

test/SILGen/objc_attr_NSManaged_multi.swift

@@ -6,14 +6,26 @@ import Foundation
 
 // CHECK-LABEL: sil hidden @_TF25objc_attr_NSManaged_multi9testMultiFCS_10SwiftGizmoPSs9AnyObject_ : $@convention(thin) (@owned SwiftGizmo) -> @owned AnyObject {
 func testMulti(obj: SwiftGizmo) -> AnyObject {
+  // CHECK: = class_method [volatile] %0 : $SwiftGizmo, #SwiftGizmo.kvc!1.foreign : SwiftGizmo -> () -> () , $@convention(objc_method) (SwiftGizmo) -> ()
+  // CHECK-NOT: return
+  // CHECK: = class_method [volatile] %0 : $SwiftGizmo, #SwiftGizmo.extKVC!1.foreign : SwiftGizmo -> () -> () , $@convention(objc_method) (SwiftGizmo) -> ()
+  // CHECK-NOT: return
   // CHECK: class_method [volatile] %0 : $SwiftGizmo, #SwiftGizmo.x!getter.1.foreign : SwiftGizmo -> () -> X , $@convention(objc_method) (SwiftGizmo) -> @autoreleased X
   // CHECK: return
+  obj.kvc()
+  obj.extKVC()
   return obj.x
 }
 
 // CHECK-LABEL: sil hidden @_TF25objc_attr_NSManaged_multi14testFinalMultiFCS_10FinalGizmoSS : $@convention(thin) (@owned FinalGizmo) -> @owned String {
 func testFinalMulti(obj: FinalGizmo) -> String {
+  // CHECK: class_method [volatile] %0 : $FinalGizmo, #FinalGizmo.kvc2!1.foreign : FinalGizmo -> () -> () , $@convention(objc_method) (FinalGizmo) -> ()
+  // CHECK-NOT: return
+  // CHECK: class_method [volatile] %0 : $FinalGizmo, #FinalGizmo.extKVC2!1.foreign : FinalGizmo -> () -> () , $@convention(objc_method) (FinalGizmo) -> ()
+  // CHECK-NOT: return
   // CHECK: class_method [volatile] %0 : $FinalGizmo, #FinalGizmo.y!getter.1.foreign : FinalGizmo -> () -> String , $@convention(objc_method) (FinalGizmo) -> @autoreleased NSString
   // CHECK: return
+  obj.kvc2()
+  obj.extKVC2()
   return obj.y
 }

test/attr/attr_NSManaged.swift

@@ -1,32 +0,0 @@
-// RUN: %target-parse-verify-swift
-
-protocol SwiftProto { }
-
-@objc class C {
-  // okay
-  @NSManaged var x: Int
-
-  // expected-error@+1{{@NSManaged property cannot have an initial value}}
-  @NSManaged var c: C = C()
-
-  // expected-error@+1{{property cannot be marked @NSManaged because its type cannot be represented in Objective-C}}
-  @NSManaged var nonobjc_var: SwiftProto?
-
-  // expected-error@+1{{@NSManaged not allowed on a 'let' property}}
-  @NSManaged let let_property: Int = 10
-
-  // expected-error@+1{{@NSManaged not allowed on computed properties}}
-  @NSManaged var computed_var: Int {
-    return 5
-  }
-
-  // expected-error@+1{{@NSManaged not allowed on observing properties}}
-  @NSManaged var observing_var: Int {
-    willSet { }
-  }
-
-  init() {
-    observing_var = 10
-  }
-}
-

test/decl/var/NSManaged_properties.swift

@@ -8,17 +8,37 @@ class X : NSObject {
   func foo() -> X { return self }
 }
 
-@NSManaged var global: Int // expected-error {{@NSManaged only allowed on a property in a class}}
+@NSManaged struct SomeStruct {} // expected-error {{@NSManaged cannot be applied to this declaration}}
 
-@NSManaged     // expected-error {{@NSManaged may only be used on 'var' declarations}}
+@NSManaged var global: Int // expected-error {{@NSManaged only allowed on an instance property or method}}
+
+@NSManaged     // expected-error {{@NSManaged only allowed on an instance property or method}}
 func managedFunction() {}
 
+protocol SwiftProto { }
+
 class SwiftGizmo : A {
   @NSManaged var a: X
   @NSManaged var b: Int
   @NSManaged let c: Int  // expected-error {{@NSManaged not allowed on a 'let' property}}
   
-  @NSManaged class var d: Int = 4  // expected-error {{@NSManaged only allowed on a property in a class}} \
+  // expected-error@+1{{@NSManaged property cannot have an initial value}}
+  @NSManaged var gizmo: SwiftGizmo = SwiftGizmo()
+  
+  // expected-error@+1{{@NSManaged not allowed on computed properties}}
+  @NSManaged var computed_var: Int {
+    return 5
+  }
+
+  // expected-error@+1{{@NSManaged not allowed on observing properties}}
+  @NSManaged var observing_var: Int {
+    willSet { }
+  }
+
+  // expected-error@+1{{property cannot be marked @NSManaged because its type cannot be represented in Objective-C}}
+  @NSManaged var nonobjc_var: SwiftProto?
+
+  @NSManaged class var d: Int = 4  // expected-error {{@NSManaged only allowed on an instance property or method}} \
             // expected-error {{class stored properties not yet supported}}
 
 
@@ -26,6 +46,10 @@ class SwiftGizmo : A {
 
   @NSCopying @NSManaged var optionalProperty : NSString?  // expected-error {{@NSManaged property cannot also be marked @NSCopying}}
 
+  @NSManaged func mutableArrayValueForA() // no-warning
+  @NSManaged func mutableArrayValueForB() {} // expected-error {{NSManaged method cannot have a body; it must be provided at runtime}}
+  @NSManaged class func mutableArrayValueForA() {} // expected-error {{@NSManaged only allowed on an instance property or method}}
+
   override init() {}
 }