remove MemberExpression from binding identifier collection

lib/6to5/transformation/transformers/es6/constants.js

@@ -10,8 +10,6 @@ exports.check = function (node) {
 var visitor = {
   enter: function (node, parent, scope, state) {
     if (t.isAssignmentExpression(node) || t.isUpdateExpression(node)) {
-      if (t.isMemberExpression(node.left || node.argument)) return;
-
       var ids = t.getBindingIdentifiers(node);
 
       for (var name in ids) {

lib/6to5/types/index.js

@@ -614,7 +614,6 @@ t.getBindingIdentifiers.keys = {
   VariableDeclarator: ["id"],
   FunctionDeclaration: ["id"],
   ClassDeclaration: ["id"],
-  MemberExpression: ["object"],
   SpreadElement: ["argument"],
   RestElement: ["argument"],
   UpdateExpression: ["argument"],