add support for this in computed property names

lib/6to5/templates/function-return-obj-this.js

@@ -0,0 +1,3 @@
+(function (obj) {
+  return obj;
+}).call(this, OBJECT)

lib/6to5/transformers/block-binding.js

@@ -117,9 +117,7 @@ var buildNode = function (node) {
   var func = b.functionExpression(null, [], block, false);
 
   var templateName = "function-call";
-  if (traverse.hasType(node, "ThisExpression")) {
-    templateName = "function-call-this";
-  }
+  if (traverse.hasType(node, "ThisExpression")) templateName += "-this";
 
   //
 

lib/6to5/transformers/computed-property-names.js

@@ -1,14 +1,18 @@
-var util = require("../util");
-var _    = require("lodash");
+var traverse = require("../traverse");
+var util     = require("../util");
+var _        = require("lodash");
 
 exports.ObjectExpression = function (node) {
   var hasComputed = false;
+  var hasThis     = false;
+
   var computed = [];
 
   node.properties = node.properties.filter(function (prop) {
     if (prop.computed) {
       hasComputed = true;
       computed.unshift(prop);
+      if (!hasThis) hasThis = traverse.hasType(prop, "ThisExpression");
       return false;
     } else {
       return true;
@@ -17,12 +21,22 @@ exports.ObjectExpression = function (node) {
 
   if (!hasComputed) return;
 
-  var container = util.template("function-return-obj", {
+  var templateName = "function-return-obj";
+  if (hasThis) templateName += "-this";
+
+  var container = util.template(templateName, {
     OBJECT: node
   });
 
+  var containerBody;
+  if (templateName === "function-return-obj") {
+    containerBody = container.callee.body.body;
+  } else {
+    containerBody = container.callee.object.body.body;
+  }
+
   _.each(computed, function (prop) {
-    container.callee.body.body.unshift(util.template("obj-key-set", {
+    containerBody.unshift(util.template("obj-key-set", {
       KEY: prop.key,
       VALUE: prop.value
     }, true));