Fine-tuning eclipse's error reporting found some minor issues and even 1 bug that would show up rarely or not at all.

src/lombok/core/AST.java

@@ -156,8 +156,8 @@ public abstract class AST<N> {
 		 * @see #isStructurallySignificant()
 		 */
 		public Node up() {
-			Node result = (Node)parent;
-			while ( result != null && !result.isStructurallySignificant ) result = (Node)result.parent;
+			Node result = parent;
+			while ( result != null && !result.isStructurallySignificant ) result = result.parent;
 			return result;
 		}
 		

src/lombok/eclipse/handlers/PKG.java

@@ -133,7 +133,7 @@ class PKG {
 		
 		if ( node.get() instanceof TypeDeclaration ) {
 			for ( AbstractMethodDeclaration def : ((TypeDeclaration)node.get()).methods ) {
-				char[] mName = ((AbstractMethodDeclaration)def).selector;
+				char[] mName = def.selector;
 				if ( mName == null ) continue;
 				if ( methodName.equals(new String(mName)) ) {
 					EclipseAST.Node existing = node.getNodeFor(def);

src/lombok/javac/JavacAST.java

@@ -269,9 +269,9 @@ public class JavacAST extends AST<JCTree> {
 				visitor.endVisitLocal(this, (JCVariableDecl)get());
 				break;
 			case STATEMENT:
-				visitor.visitStatement(this, (JCTree)get());
+				visitor.visitStatement(this, get());
 				traverseChildren(visitor, this);
-				visitor.endVisitStatement(this, (JCTree)get());
+				visitor.endVisitStatement(this, get());
 				break;
 			case ANNOTATION:
 				switch ( up().getKind() ) {

src/lombok/javac/handlers/HandleData.java

@@ -43,7 +43,7 @@ public class HandleData implements JavacAnnotationHandler<Data> {
 		Node typeNode = annotationNode.up();
 		JCClassDecl typeDecl = null;
 		if ( typeNode.get() instanceof JCClassDecl ) typeDecl = (JCClassDecl)typeNode.get();
-		long flags = typeDecl.mods.flags;
+		long flags = typeDecl == null ? 0 : typeDecl.mods.flags;
 		boolean notAClass = (flags & (Flags.INTERFACE | Flags.ENUM | Flags.ANNOTATION)) != 0;
 		
 		if ( typeDecl == null || notAClass ) {