=== tests/cases/compiler/functionReturn.ts ===
function f0(): void { }
>f0 : () => void

function f1() {
>f1 : () => void

    var n: any = f0();
>n : any
>f0() : void
>f0 : () => void
}
function f2(): any { }
>f2 : () => any

function f3(): string { return; }
>f3 : () => string

function f4(): string {
>f4 : () => string

    return '';
>'' : string

    return;
}
function f5(): string {
>f5 : () => string

    return '';
>'' : string

    return undefined;
>undefined : undefined
}