diff options
Diffstat (limited to 'tests/ui/self/arbitrary_self_types_pointers_and_wrappers.rs')
| -rw-r--r-- | tests/ui/self/arbitrary_self_types_pointers_and_wrappers.rs | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/self/arbitrary_self_types_pointers_and_wrappers.rs b/tests/ui/self/arbitrary_self_types_pointers_and_wrappers.rs index 65fec3bec..91aacedfc 100644 --- a/tests/ui/self/arbitrary_self_types_pointers_and_wrappers.rs +++ b/tests/ui/self/arbitrary_self_types_pointers_and_wrappers.rs @@ -3,6 +3,7 @@ #![feature(rustc_attrs)] use std::{ + cell::Cell, ops::{Deref, CoerceUnsized, DispatchFromDyn}, marker::Unsize, }; @@ -20,6 +21,20 @@ impl<T: ?Sized> Deref for Ptr<T> { impl<T: Unsize<U> + ?Sized, U: ?Sized> CoerceUnsized<Ptr<U>> for Ptr<T> {} impl<T: Unsize<U> + ?Sized, U: ?Sized> DispatchFromDyn<Ptr<U>> for Ptr<T> {} + +struct CellPtr<'a, T: ?Sized>(Cell<&'a T>); + +impl<'a, T: ?Sized> Deref for CellPtr<'a, T> { + type Target = T; + + fn deref(&self) -> &T { + self.0.get() + } +} + +impl<'a, T: Unsize<U> + ?Sized, U: ?Sized> CoerceUnsized<CellPtr<'a, U>> for CellPtr<'a, T> {} +impl<'a, T: Unsize<U> + ?Sized, U: ?Sized> DispatchFromDyn<CellPtr<'a, U>> for CellPtr<'a, T> {} + struct Wrapper<T: ?Sized>(T); impl<T: ?Sized> Deref for Wrapper<T> { @@ -42,6 +57,7 @@ trait Trait { fn ptr_wrapper(self: Ptr<Wrapper<Self>>) -> i32; fn wrapper_ptr(self: Wrapper<Ptr<Self>>) -> i32; fn wrapper_ptr_wrapper(self: Wrapper<Ptr<Wrapper<Self>>>) -> i32; + fn cell(self: CellPtr<Self>) -> i32; } impl Trait for i32 { @@ -54,6 +70,9 @@ impl Trait for i32 { fn wrapper_ptr_wrapper(self: Wrapper<Ptr<Wrapper<Self>>>) -> i32 { ***self } + fn cell(self: CellPtr<Self>) -> i32 { + *self + } } fn main() { @@ -65,4 +84,7 @@ fn main() { let wpw = Wrapper(Ptr(Box::new(Wrapper(7)))) as Wrapper<Ptr<Wrapper<dyn Trait>>>; assert_eq!(wpw.wrapper_ptr_wrapper(), 7); + + let c = CellPtr(Cell::new(&8)) as CellPtr<dyn Trait>; + assert_eq!(c.cell(), 8); } |