1 files changed, 7 insertions, 2 deletions
diff --git a/src/lombok/core/AST.java b/src/lombok/core/AST.java
index c1186d24..8e060f07 100644
--- a/src/lombok/core/AST.java
+++ b/src/lombok/core/AST.java
@@ -134,7 +134,7 @@ public abstract class AST<N> {
 		}
 		
 		public Collection<? extends Node> down() {
-			return children;
+			return new ArrayList<Node>(children);
 		}
 		
 		public boolean isHandled() {
@@ -154,13 +154,18 @@ public abstract class AST<N> {
 			return fileName;
 		}
 		
-		public Node add(N newChild, Kind kind) {
+		@SuppressWarnings("unchecked") public Node add(N newChild, Kind kind) {
 			Node n = buildTree(newChild, kind);
 			if ( n == null ) return null;
 			n.parent = this;
+			((List)children).add(n);
 			return n;
 		}
 		
+		public void removeChild(Node child) {
+			children.remove(child);
+		}
+		
 		public Node recursiveSetHandled() {
 			this.handled = true;
 			for ( Node child : children ) child.recursiveSetHandled();