Amélioration toString ConsListImpl

src/migl/util/ConsListImpl.java

@@ -78,15 +78,15 @@ public class ConsListImpl<E> extends Cons<E, ConsList<E>> implements ConsList<E>
 	
 	@Override
 	public String toString() {
-		String str = "(";
+		StringBuffer str = new StringBuffer("(");
 		for(E e : this) {
 			if(e == null) {
-				str += "null ";
+				str.append("null ");
 			} else {
-				str += e.toString() + " ";
+				str.append(e + " ");
 			}
 		}
-		return str.trim() + ")";
+		return str.toString().trim() + ")";
 	}
 	
 	@Override