From 76e70c3923c13e2c21a9f24d274bdc82379b7825 Mon Sep 17 00:00:00 2001
From: David Majda <david@majda.cz>
Date: Wed, 14 Sep 2016 13:48:12 +0200
Subject: [PATCH] Don't use "objects" in
 lib/compiler/passes/report-duplicate-labels.js

The "objects" module will be removed.

See #442.
---
 lib/compiler/passes/report-duplicate-labels.js | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/lib/compiler/passes/report-duplicate-labels.js b/lib/compiler/passes/report-duplicate-labels.js
index a027bd9..7614594 100644
--- a/lib/compiler/passes/report-duplicate-labels.js
+++ b/lib/compiler/passes/report-duplicate-labels.js
@@ -1,13 +1,22 @@
 "use strict";
 
 let GrammarError = require("../../grammar-error"),
-    objects      = require("../../utils/objects"),
     visitor      = require("../visitor");
 
 /* Checks that each label is defined only once within each scope. */
 function reportDuplicateLabels(ast) {
+  function cloneEnv(env) {
+    let clone = {};
+
+    Object.keys(env).forEach(name => {
+      clone[name] = env[name];
+    });
+
+    return clone;
+  }
+
   function checkExpressionWithClonedEnv(node, env) {
-    check(node.expression, objects.clone(env));
+    check(node.expression, cloneEnv(env));
   }
 
   let check = visitor.build({
@@ -17,7 +26,7 @@ function reportDuplicateLabels(ast) {
 
     choice: function(node, env) {
       node.alternatives.forEach(alternative => {
-        check(alternative, objects.clone(env));
+        check(alternative, cloneEnv(env));
       });
     },