impl Foo for Bar {
    fn foo() {
        "hi"
    }
}

pub impl Foo for Bar {
    // Comment 1
    fn foo() {
        "hi"
    }
    // Comment 2
    fn foo() {
        "hi"
    }
    // Comment 3
}

pub unsafe impl<'a, 'b, X, Y: Foo<Bar>> !Foo<'a, X> for Bar<'b, Y> where X: Foo<'a, Z>
{
    fn foo() {
        "hi"
    }
}

impl<'a, 'b, X, Y: Foo<Bar>> Foo<'a, X> for Bar<'b, Y>
    where X: Fooooooooooooooooooooooooooooo<'a, Z>
{
    fn foo() {
        "hi"
    }
}

impl<'a, 'b, X, Y: Foo<Bar>> Foo<'a, X> for Bar<'b, Y> where X: Foooooooooooooooooooooooooooo<'a, Z>
{
    fn foo() {
        "hi"
    }
}

impl Foo {
    fn foo() {}
}

impl Boo {
    // BOO
    fn boo() {}
    // FOO
}

mod a {
    impl Foo {
        // Hello!
        fn foo() {}
    }
}


mod b {
    mod a {
        impl Foo {
            fn foo() {}
        }
    }
}

impl Foo {
    add_fun!();
}

impl Blah {
    fn boop() {}
    add_fun!();
}

impl X {
    fn do_parse(mut self: X) {}
}

impl Y5000 {
    fn bar(self: X<'a, 'b>, y: Y) {}
}