add generators support via regenerator

test/browser.html

@@ -13,6 +13,7 @@
     <script>mocha.setup("tdd");</script>
     <script src="../dist/6to5-test.js"></script>
     <script>
+      mocha.globals(["regeneratorRuntime"]);
       mocha.checkLeaks();
       mocha.run();
     </script>

test/fixtures/syntax/generators/for-of/actual.js

@@ -0,0 +1,20 @@
+function *range(max, step) {
+  var count = 0;
+  step = step || 1;
+
+  for (var i = 0; i < max; i += step) {
+    count++;
+    yield i;
+  }
+
+  return count;
+}
+
+var gen = range(20, 3);
+var values = [];
+
+for (var value of gen) {
+  values.push(value);
+}
+
+assert.deepEqual(values, [0, 3, 6, 9, 12, 15, 18]);

test/fixtures/syntax/generators/options.json

@@ -0,0 +1,3 @@
+{
+  "exec": true
+}

test/fixtures/syntax/generators/simple/actual.js

@@ -0,0 +1,19 @@
+function *range(max, step) {
+  var count = 0;
+  step = step || 1;
+
+  for (var i = 0; i < max; i += step) {
+    count++;
+    yield i;
+  }
+
+  return count;
+}
+
+var gen = range(20, 3), info;
+
+while (!(info = gen.next()).done) {
+  info.value;
+}
+
+assert(info.value, 7);

test/mocha.opts

@@ -1,3 +1,4 @@
 --reporter dot
 --ui tdd
 --check-leaks
+--globals regeneratorRuntime