Invalid left hand side of assignment

Broken in the last six days. The following was and is okay:

var foo = function(){}
foo = function(){}

However as soon as you split the two into external modules
i.e. mod1.ts

export var foo = function(){}

mod2.ts

import mod1 = require('./mod1'); 
mod1.foo = function(){}; // Error : Invalid left hand side of assignment

that is caused by #2476. foo in import {foo} from "mod" should be immutable, but i do not think ns.foo in import * as ns from "mod" should be.

I've checked ES6 spec - all bindings that are created for imported names are immutable so all cases below should be illegal:

import * as ns, {foo} from 'foo'
import d from 'foo'

ns.a = 1;
foo = 1;
d = 1;

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