function call<P1, R>(f: (p1: P1) => R, p1: P1): R {
    return f(p1);
}

function identity<T>(o: T): T {
    return o;
}

const x = call(identity, 1);


// When the parameters are reversed, it works:

function callReversed<P1, R>(p1: P1, f: (p1: P1) => R): R {
    return f(p1);
}

const y = callReversed(1, identity);