=== tests/cases/compiler/functionOverloads21.ts ===
function foo(bar:{a:number;}[]);
>foo : { (bar: { a: number; }[]): any; (bar: { a: number; b: string; }[]): any; }
>bar : { a: number; }[]
>a : number

function foo(bar:{a:number; b:string;}[]);
>foo : { (bar: { a: number; }[]): any; (bar: { a: number; b: string; }[]): any; }
>bar : { a: number; b: string; }[]
>a : number
>b : string

function foo(bar:{a:any; b?:string;}[]) { return 0 }
>foo : { (bar: { a: number; }[]): any; (bar: { a: number; b: string; }[]): any; }
>bar : { a: any; b?: string; }[]
>a : any
>b : string
>0 : number