6.0.0

I'm extremely stupid and didn't commit as I go. To anyone reading this
I'm extremely sorry. A lot of these changes are very broad and I plan on
releasing Babel 6.0.0 today live on stage at Ember Camp London so I'm
afraid I couldn't wait. If you're ever in London I'll buy you a beer
(or assorted beverage!) to make up for it, also I'll kiss your feet and
give you a back massage, maybe.

packages/babel-plugin-transform-es2015-constants/package.json

@@ -1,11 +1,14 @@
 {
   "name": "babel-plugin-transform-es2015-constants",
-  "version": "1.0.0",
+  "version": "5.10.32",
   "description": "Compile ES2015 constants to ES5",
   "repository": "babel/babel",
   "license": "MIT",
   "main": "lib/index.js",
   "keywords": [
     "babel-plugin"
-  ]
-}
+  ],
+  "dependencies": {
+    "babel-runtime": "^5.10.32"
+  }
+}

packages/babel-plugin-transform-es2015-constants/src/index.js

@@ -1,19 +1,37 @@
-export default function ({ messages }) {
+export default function ({ messages, types: t }) {
+  function check(node) {
+    if (t.isVariableDeclaration(node, { kind: "const" })) {
+      node.kind = "let";
+    }
+  }
+
   return {
     visitor: {
       Scope({ scope }) {
-        for (var name in scope.bindings) {
-          var binding = scope.bindings[name];
+        for (let name in scope.bindings) {
+          let binding = scope.bindings[name];
           if (binding.kind !== "const" && binding.kind !== "module") continue;
 
-          for (var violation of (binding.constantViolations: Array)) {
+          for (let violation of (binding.constantViolations: Array)) {
             throw violation.buildCodeFrameError(messages.get("readOnly", name));
           }
         }
       },
 
       VariableDeclaration({ node }) {
-        if (node.kind === "const") node.kind = "let";
+        check(node);
+      },
+
+      ForXStatement({ node: { left } }) {
+        check(left);
+      },
+
+      ForStatement({ node: { init } }) {
+        check(init);
+      },
+
+      "BlockStatement|Program"({ node: { body } }) {
+        for (let node of body) check(node);
       }
     }
   };