diff --git a/lib/6to5/transform.js b/lib/6to5/transform.js
index 77aac395c8..277333c665 100644
--- a/lib/6to5/transform.js
+++ b/lib/6to5/transform.js
@@ -49,7 +49,7 @@ transform.test = function (task, assert) {
     actualCode = result.code;
 
     var expectAst    = util.parse(expect, expectCode);
-    var expectResult = generate(expectAst);
+    var expectResult = generate(expectCode, expectAst);
     expectCode       = expectResult.code;
 
     try {
@@ -68,12 +68,11 @@ transform.test = function (task, assert) {
     var consumer = new sourceMap.SourceMapConsumer(result.map);
 
     _.each(task.sourceMappings, function (mapping, i) {
-      var generated = mapping.generated;
-      var original  = mapping.original;
+      var gen  = mapping.generated;
+      var orig = mapping.original;
 
-      var pos = consumer.originalPositionFor(generated);
-      var msg = "source mapping " + i + " - generated: " + generated.line + ":" + generated.column;
-      assert.equal(pos.line + ":" + pos.column, original.line + ":" + original.column, msg);
+      var pos = consumer.originalPositionFor(gen);
+      assert.equal(pos.line + ":" + pos.column, orig.line + ":" + orig.column);
     });
   }
 };
@@ -87,8 +86,6 @@ transform._ensureTransformerNames = function (type, keys) {
 };
 
 transform.transformers = {
-  _comments:               require("./transformers/_comments"),
-
   modules:                  require("./transformers/modules"),
   computedPropertyNames:    require("./transformers/computed-property-names"),
   propertyNameShorthand:    require("./transformers/property-name-shorthand"),
diff --git a/lib/6to5/transformers/_comments.js b/lib/6to5/transformers/_comments.js
deleted file mode 100644
index 3a008f1108..0000000000
--- a/lib/6to5/transformers/_comments.js
+++ /dev/null
@@ -1,3 +0,0 @@
-module.exports = function () {
-
-};