fix bug, reformat

Parser/spec/Helpers.jadd

 aspect Helpers {
 
   public void ASTNode.checkTreeStructure() {
-        for (ASTNode child : astChildren()) {
+    for (ASTNode child : this.astChildren()) {
       if (child.getParent() != this) {
         throw new RuntimeException();
       }
@@ -10,9 +10,8 @@ aspect Helpers {
   }
 
   public void ASTNode.fixTreeStructure() {
-        for (ASTNode child : astChildren()) {
+    for (ASTNode child : this.astChildren()) {
       if (child.getParent() != this) {
-                // System.err.println("fixed parent of " + child);
         child.parent = this;
       }
       child.fixTreeStructure();