=== tests/cases/compiler/indexer3.ts ===
var dateMap: { [x: string]: Date; } = {}
>dateMap : { [x: string]: Date; }
>x : string
>Date : Date
>{} : { [x: string]: undefined; }

var r: Date = dateMap["hello"] // result type includes indexer using BCT
>r : Date
>Date : Date
>dateMap["hello"] : Date
>dateMap : { [x: string]: Date; }
>"hello" : string