=== tests/cases/compiler/contextualTyping17.ts ===
var foo: {id:number;} = {id:4}; foo = {id: 5, name:"foo"};
>foo : { id: number; }
>id : number
>{id:4} : { id: number; }
>id : number
>4 : number
>foo = {id: 5, name:"foo"} : { id: number; name: string; }
>foo : { id: number; }
>{id: 5, name:"foo"} : { id: number; name: string; }
>id : number
>5 : number
>name : string
>"foo" : string