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# Error code E0593

You tried to supply an `Fn`-based type with an incorrect number of arguments than what was expected.

Erroneous code example:

    fn foo<F: Fn()>(x: F) { }

    fn main() {
        // [E0593] closure takes 1 argument but 0 arguments are required
        foo(|y| { });
    }

You have to provide the same number of arguments as expected by the `Fn`-based type. So to fix the previous example, we need to remove the `y` argument:

    fn foo<F: Fn()>(x: F) { }

    fn main() {
        foo(|| { }); // ok!
    }