#![feature(impl_restriction)]

pub
impl(crate)
trait Foo {}

pub impl
( in
crate )
trait
Bar
{}

pub
impl ( in foo
::
bar )
trait Baz {}

pub
const
impl
(self)
trait QuxConst {}

pub 
auto impl(
super
)
trait QuxAuto {}

pub 
unsafe impl
(in crate)
trait QuxUnsafe {}

pub const 
unsafe impl
(in super
::foo)
trait QuxConstUnsafe {}