minor non-breaking renaming

std/haxe/macro/Expr.hx

@@ -221,7 +221,7 @@ typedef TypeDefinition = {
 enum TypeDefKind {
 	TDEnum;
 	TDStructure;
-	TDClass( ?extend : TypePath, ?implement : Array<TypePath>, ?isInterface : Bool );
+	TDClass( ?superClass : TypePath, ?interfaces : Array<TypePath>, ?isInterface : Bool );
 	TDAlias( t : ComplexType ); // ignore TypeDefinition.fields
 }