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https://github.com/rust-lang/rust
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43 lines
887 B
Rust
43 lines
887 B
Rust
//@ run-pass
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#![allow(unused_variables)]
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#![allow(stable_features)]
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// Test a very simple custom DST coercion.
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#![feature(core, rc_weak)]
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use std::cell::RefCell;
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use std::rc::{Rc, Weak};
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trait Baz {
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fn get(&self) -> i32;
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}
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impl Baz for i32 {
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fn get(&self) -> i32 {
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*self
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}
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}
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fn main() {
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let a: Rc<[i32; 3]> = Rc::new([1, 2, 3]);
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let b: Rc<[i32]> = a;
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assert_eq!(b[0], 1);
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assert_eq!(b[1], 2);
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assert_eq!(b[2], 3);
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let a: Rc<i32> = Rc::new(42);
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let b: Rc<dyn Baz> = a.clone();
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assert_eq!(b.get(), 42);
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let c: Weak<i32> = Rc::downgrade(&a);
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let d: Weak<dyn Baz> = c.clone();
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let _c = b.clone();
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let a: Rc<RefCell<i32>> = Rc::new(RefCell::new(42));
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let b: Rc<RefCell<dyn Baz>> = a.clone();
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assert_eq!(b.borrow().get(), 42);
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// FIXME
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let c: Weak<RefCell<dyn Baz>> = Rc::downgrade(&a) as Weak<_>;
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}
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