some fixes to the benchmark

benchmark/benchmark.less

@@ -12,6 +12,28 @@
 @colour_positive: #ff0000;
 @colour_negative: #ff0000;
 
+.box_shadow () {
+}
+.text_shadow () {
+}
+.border_radius () {
+}
+.border_radius_top_left () {
+}
+.border_radius_top_right () {
+}
+.border_radius_bottom_right () {
+}
+.border_radius_bottom_left () {
+}
+.border_radius_top () {
+}
+.border_radius_right () {
+}
+.border_radius_bottom () {
+}
+.border_radius_left () {
+}
 div.browse {
   margin: 0 0 20px;
   &.class {

benchmark/less-benchmark.js

@@ -19,6 +19,11 @@ fs.stat(file, function (e, stats) {
             tree = less.parser.parse(data);
             end = new(Date);
 
+            if (less.parser.error) {
+                process.stdio.writeError(less.parser.error.message);
+                process.exit(3);
+            }
+
             total = end - start;
 
             sys.puts("Parsing: " +