`arguments` outside of a function is an ordinary variable.

Fix #501

diff --git a/lib/scope.js b/lib/scope.js
index 8fc1ce0..713a2c9 100644 (file)
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -165,7 +165,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(){
                     for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope)
                         s.uses_eval = true;
                 }
-                if (name == "arguments") {
+                if (func && name == "arguments") {
                     func.uses_arguments = true;
                 }
             } else {