fix regenerator transformer order - fixes #617

lib/6to5/transformation/transformers/es6/parameters.rest.js

@@ -58,15 +58,15 @@ exports.Function = function (node, parent, scope) {
     node.body.body.unshift(restDeclar);
   }
 
-  node.body.body.unshift(
-    util.template("rest", {
-      ARGUMENTS: argsId,
-      ARRAY_KEY: arrKey,
-      ARRAY_LEN: arrLen,
-      START: start,
-      ARRAY: rest,
-      KEY: key,
-      LEN: len,
-    })
-  );
+  var loop = util.template("rest", {
+    ARGUMENTS: argsId,
+    ARRAY_KEY: arrKey,
+    ARRAY_LEN: arrLen,
+    START: start,
+    ARRAY: rest,
+    KEY: key,
+    LEN: len,
+  });
+  loop._blockHoist = node.params.length + 1;
+  node.body.body.unshift(loop);
 };

lib/6to5/transformation/transformers/index.js

@@ -52,14 +52,13 @@ module.exports = {
   // needs to be after `es6.blockScoping` due to needing `letReferences` set on blocks
   "es6.blockScopingTDZ":                   require("./es6/block-scoping-tdz"),
 
-  // needs to be after block scoping since regenerator doesn't support it
-  regenerator:                             require("./other/regenerator"),
-
   "es6.parameters.default":                require("./es6/parameters.default"),
   "es6.parameters.rest":                   require("./es6/parameters.rest"),
 
   "es6.destructuring":                     require("./es6/destructuring"),
 
+  regenerator:                             require("./other/regenerator"),
+
   // needs to be after `regenerator` due to needing `regeneratorRuntime` references
   // needs to be after `es6.forOf` due to needing `Symbol.iterator` references
   // needs to be before `es6.modules` due to dynamic imports