diff --git a/lib/6to5/register.js b/lib/6to5/register.js
index 553e62a5f9..2cd90de4b9 100644
--- a/lib/6to5/register.js
+++ b/lib/6to5/register.js
@@ -24,28 +24,28 @@ var blacklist  = [];
 
 var blacklistTest = function (transformer, code) {
   try {
-    eval(code);
+    new Function(code);
     blacklist.push(transformer);
   } catch (err) {
     if (err.name !== "SyntaxError") throw err;
   }
 };
 
-// array comprehension
+blacklistTest("arrayComprehension", "var foo = [for (foo of bar) foo * foo];");
 blacklistTest("arrowFunctions", "var foo = x => x * x;");
 blacklistTest("classes", "class Foo {}");
-// computed property names
-// constants
-// defaultParamters
-// descturing
-// forOf
-blacklistTest("generators", "function foo *() {}");
+//blacklistTest("computedPropertyNames", "");
+blacklistTest("constants", "const foo = 0;");
+blacklistTest("defaultParamaters", "var foo = function (bar = 0) {};");
+blacklistTest("destructuring", "var { x, y } = { x: 0, y: 0 };");
+blacklistTest("forOf", "for (var foo of bar) {}");
+blacklistTest("generators", "function* foo() {}");
 blacklistTest("letScoping", "let foo = 0;");
-// modules
-// propertyMethodAssignment
-// propertyNameShorthand
-// restParameters
-// spread
+//blacklistTest("modules", "");
+//blacklistTest("propertyMethodAssignment", "");
+blacklistTest("propertyNameShorthand", "var foo = { x, y };");
+//blacklistTest("restParameters", "");
+//blacklistTest("spread", "");
 blacklistTest("templateLiterals", "`foo`");
 blacklistTest("unicodeRegex", "/foo/u");