1 //! This is a fixture we use for tests that need lang items.
3 //! We want to include the minimal subset of core for each test, so this file
4 //! supports "conditional compilation". Tests use the following syntax to include minicore:
6 //! //- minicore: flag1, flag2
8 //! We then strip all the code marked with other flags.
15 //! coerce_unsized: unsize
21 #[rustc_specialization_trait]
27 pub trait Unsize<T: ?Sized> {}
32 // region:coerce_unsized
34 use crate::marker::Unsize;
36 #[lang = "coerce_unsized"]
37 pub trait CoerceUnsized<T: ?Sized> {}
39 impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a mut U> for &'a mut T {}
40 impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b mut T {}
41 impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for &'a mut T {}
42 impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*const U> for &'a mut T {}
44 impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
45 impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*const U> for &'a T {}
47 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
48 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*const U> for *mut T {}
49 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*const U> for *const T {}
51 pub use self::unsize::CoerceUnsized;
52 // endregion:coerce_unsized
58 #[lang = "deref_target"]
60 fn deref(&self) -> &Self::Target;
63 pub use self::deref::Deref;
71 pub fn len(&self) -> usize { loop {} }
78 pub use crate::marker::Sized; // :sized