Bad type error

[elbarzil]

The following fails to typecheck, complaining that type 'number' is not assignable to type '() => void'.

function nop(): void { return void 0; }
function foo(xs: (number | (()=>void))[]): (() => void) {
    return xs.reduce(((acc, x) => nop), nop);
}

But the code never actually looks at the contents, so it should work (and it does, if I change the argument type to something other than a function).

[RyanCavanaugh]

Duplicate of #7014