==== tests/cases/compiler/contextualTyping21.ts (1 errors) ====
    var foo:{id:number;}[] = [{id:1}]; foo = [{id:1}, 1];
                                       ~~~
!!! Type '{}[]' is not assignable to type '{ id: number; }[]':
!!!   Type '{}' is not assignable to type '{ id: number; }':
!!!     Property 'id' is missing in type '{}'.