diff --git a/Source/NSConcreteHashTable.m b/Source/NSConcreteHashTable.m
index bf255273b..906efdf8a 100644
--- a/Source/NSConcreteHashTable.m
+++ b/Source/NSConcreteHashTable.m
@@ -972,7 +972,8 @@ const NSHashTableCallBacks NSPointerToStructHashCallBacks =
 
 - (id) initWithCoder: (NSCoder*)aCoder
 {
-  return [self subclassResponsibility: _cmd];
+  [self subclassResponsibility: _cmd];
+  return nil;
 }
 
 - (id) initWithPointerFunctions: (NSPointerFunctions*)functions
diff --git a/Source/NSConcreteMapTable.m b/Source/NSConcreteMapTable.m
index 5bc9a373f..f9b1423a0 100644
--- a/Source/NSConcreteMapTable.m
+++ b/Source/NSConcreteMapTable.m
@@ -1232,7 +1232,8 @@ const NSMapTableValueCallBacks NSOwnedPointerMapValueCallBacks =
 
 - (id) initWithCoder: (NSCoder*)aCoder
 {
-  return [self subclassResponsibility: _cmd];
+  [self subclassResponsibility: _cmd];
+  return nil;
 }
 
 - (id) initWithKeyPointerFunctions: (NSPointerFunctions*)keyFunctions
diff --git a/Source/NSHashTable.m b/Source/NSHashTable.m
index cfab7783f..3fdac68ea 100644
--- a/Source/NSHashTable.m
+++ b/Source/NSHashTable.m
@@ -94,7 +94,8 @@ static Class	concreteClass = 0;
 - (id) initWithPointerFunctions: (NSPointerFunctions*)functions
 		capacity: (NSUInteger)initialCapacity
 {
-  return [self subclassResponsibility: _cmd];
+  [self subclassResponsibility: _cmd];
+  return nil;
 }
 
 - (void) addObject: (id)object
@@ -133,7 +134,8 @@ static Class	concreteClass = 0;
 
 - (id) copyWithZone: (NSZone*)aZone
 {
-  return [self subclassResponsibility: _cmd];
+  [self subclassResponsibility: _cmd];
+  return nil;
 }
 
 - (NSUInteger) count
@@ -160,7 +162,8 @@ static Class	concreteClass = 0;
 
 - (id) initWithCoder: (NSCoder*)aCoder
 {
-  return [self subclassResponsibility: _cmd];
+  [self subclassResponsibility: _cmd];
+  return nil;
 }
 
 - (void) intersectHashTable: (NSHashTable*)other
diff --git a/Source/NSMapTable.m b/Source/NSMapTable.m
index 83e1269a0..da7874829 100644
--- a/Source/NSMapTable.m
+++ b/Source/NSMapTable.m
@@ -123,12 +123,14 @@ static Class	concreteClass = 0;
 	     valuePointerFunctions: (NSPointerFunctions*)valueFunctions
 			  capacity: (NSUInteger)initialCapacity
 {
-  return [self subclassResponsibility: _cmd];
+  [self subclassResponsibility: _cmd];
+  return nil;
 }
 
 - (id) copyWithZone: (NSZone*)aZone
 {
-  return [self subclassResponsibility: _cmd];
+  [self subclassResponsibility: _cmd];
+  return nil;
 }
 
 - (NSUInteger) count
@@ -172,7 +174,8 @@ static Class	concreteClass = 0;
 
 - (id) initWithCoder: (NSCoder*)aCoder
 {
-  return [self subclassResponsibility: _cmd];
+  [self subclassResponsibility: _cmd];
+  return nil;
 }
 
 - (BOOL) isEqual: (id)other
diff --git a/Source/NSPointerFunctions.m b/Source/NSPointerFunctions.m
index 23fa89eee..ca976d80d 100644
--- a/Source/NSPointerFunctions.m
+++ b/Source/NSPointerFunctions.m
@@ -62,7 +62,8 @@ static Class	concreteClass = Nil;
 
 - (id) initWithOptions: (NSPointerFunctionsOptions)options
 {
-  return [self subclassResponsibility: _cmd];
+  [self subclassResponsibility: _cmd];
+  return nil;
 }
 
 - (void* (*)(const void *item,
diff --git a/Source/NSXMLNode.m b/Source/NSXMLNode.m
index ae6dadbb0..239d6a84b 100644
--- a/Source/NSXMLNode.m
+++ b/Source/NSXMLNode.m
@@ -194,7 +194,8 @@
 
 - (id) copyWithZone: (NSZone*)zone
 {
-  return [self notImplemented: _cmd];
+  [self notImplemented: _cmd];
+  return nil;
 }
 
 - (void) dealloc