codegen and dropped the useless walker

lib/parse.js

@@ -833,15 +833,12 @@ function parse($TEXT, exigent_mode) {
         expect(":");
         S.labels.push(label);
         var start = S.token, stat = statement();
-        if (exigent_mode && !(stat instanceof AST_LabeledStatement))
-            unexpected(start);
         S.labels.pop();
-        stat.label = label;
-        return stat;
+        return new AST_LabeledStatement({ statement: stat });
     };
 
     function simple_statement() {
-        return new AST_Statement({ body: prog1(expression, semicolon) });
+        return new AST_SimpleStatement({ body: prog1(expression, semicolon) });
     };
 
     function break_cont(type) {
@@ -1024,7 +1021,11 @@ function parse($TEXT, exigent_mode) {
             next();
             bfinally = new AST_Finally({
                 start : start,
-                body  : block_(),
+                body  : new AST_Bracketed({
+                    start : S.token,
+                    body  : block_(),
+                    end   : prev()
+                }),
                 end   : prev()
             });
         }