How to sort a List in Mojo?

sort() can be used on lists of integers without further ado.

But if I define my own type, which trait shall I implement on it so that lists made of it can be sorted?

@value
struct MyStruct(LessThanOrEqualComparable):
    fn __le__(self, other: Self) -> Bool:
        return True

fn main() raises:
    var my_integers = List(3,1,2)
    sort(my_integers)
    print(" ".join(my_integers))

    var my_objects = List(MyStruct())
    sort(my_objects)

error: no matching function in call to 'sort'
note: candidate not viable: failed to infer parameter #0