function example(): void {
    using $foo = 1.. if $foo->contains($y) {

    }

    using $foo = 1..10 if $foo->contains($y) {

    }

    using $foo = 1..=10 if $foo->contains($y) {

    }

    // this is a compile error, because the range does not have a start
    using $foo = ..10 if $foo->contains($y) {

    }

    // this is a compile error, because the range does not have a start
    using $foo = ..=10 if $foo->contains($y) {

    }

    // this is a compile error, because the range does not have a start
    using $foo = .. if $foo->contains($y) {

    }
}