=== tests/cases/compiler/ambientModules.ts ===
declare module Foo.Bar { export var foo; };
>Foo : typeof Foo
>Bar : typeof Bar
>foo : any

Foo.Bar.foo = 5; 
>Foo.Bar.foo = 5 : number
>Foo.Bar.foo : any
>Foo.Bar : typeof Foo.Bar
>Foo : typeof Foo
>Bar : typeof Foo.Bar
>foo : any
>5 : number