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

pub impl Foo for Bar {
    // Associated Constants
    const Baz: i32 = 16;
    // Associated Types
    type FooBar = usize;
    // 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<T> Foo for Bar<T> where T: Baz {}

impl<T> Foo for Bar<T>
    where T: Baz
{
    // Comment
}

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) {}

    fn bad(&self, (x, y): CoorT) {}

    fn turbo_bad(self: X<'a, 'b>, (x, y): CoorT) {}
}

pub impl<T> Foo for Bar<T>
    where T: Foo
{
    fn foo() {
        "hi"
    }
}

pub impl<T, Z> Foo for Bar<T, Z>
    where T: Foo,
          Z: Baz
{
}