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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/dynamically-sized-types/dst-coerce-rc.rs | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/test/ui/dynamically-sized-types/dst-coerce-rc.rs b/src/test/ui/dynamically-sized-types/dst-coerce-rc.rs new file mode 100644 index 000000000..683fa6850 --- /dev/null +++ b/src/test/ui/dynamically-sized-types/dst-coerce-rc.rs @@ -0,0 +1,42 @@ +// run-pass +#![allow(unused_variables)] +#![allow(stable_features)] +// Test a very simple custom DST coercion. + +#![feature(core, rc_weak)] + +use std::cell::RefCell; +use std::rc::{Rc, Weak}; + +trait Baz { + fn get(&self) -> i32; +} + +impl Baz for i32 { + fn get(&self) -> i32 { + *self + } +} + +fn main() { + let a: Rc<[i32; 3]> = Rc::new([1, 2, 3]); + let b: Rc<[i32]> = a; + assert_eq!(b[0], 1); + assert_eq!(b[1], 2); + assert_eq!(b[2], 3); + + let a: Rc<i32> = Rc::new(42); + let b: Rc<dyn Baz> = a.clone(); + assert_eq!(b.get(), 42); + + let c: Weak<i32> = Rc::downgrade(&a); + let d: Weak<dyn Baz> = c.clone(); + + let _c = b.clone(); + + let a: Rc<RefCell<i32>> = Rc::new(RefCell::new(42)); + let b: Rc<RefCell<dyn Baz>> = a.clone(); + assert_eq!(b.borrow().get(), 42); + // FIXME + let c: Weak<RefCell<dyn Baz>> = Rc::downgrade(&a) as Weak<_>; +} |