01: package expr.tree.ast; 02: 03: public class NegExpr extends Expr { 04: public final Expr e; 05: 06: public NegExpr(Expr expr) { 07: super (); 08: this .e = expr; 09: } 10: 11: public void accept(TreeWalker walker) { 12: walker.visit(this); 13: } 14: }