=== tests/cases/compiler/file3.ts ===
import x = require("file1");
>x : number

import "file2";
let a: x.A; // should not work
>a : x.A
>x : any

=== tests/cases/compiler/file1.d.ts ===
declare module "file1" {
>"file1" : typeof import("file1")

    var x: number;
>x : number

    export = x;
>x : number
}

=== tests/cases/compiler/file2.ts ===
/// <reference path="file1.d.ts"/>
import x = require("file1"); 
>x : number

// augmentation for 'file1'
// should error since 'file1' does not have namespace meaning
declare module "file1" {
>"file1" : any

    interface A { a }
>a : any
}