437 lines
9.3 KiB
Rust
437 lines
9.3 KiB
Rust
use super::*;
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use std::boxed::Box;
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use std::cell::RefCell;
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use std::clone::Clone;
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use std::convert::{From, TryInto};
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use std::mem::drop;
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use std::option::Option::{self, None, Some};
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use std::result::Result::{Err, Ok};
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#[test]
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fn test_clone() {
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let x = Rc::new(RefCell::new(5));
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let y = x.clone();
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*x.borrow_mut() = 20;
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assert_eq!(*y.borrow(), 20);
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}
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#[test]
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fn test_simple() {
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let x = Rc::new(5);
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assert_eq!(*x, 5);
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}
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#[test]
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fn test_simple_clone() {
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let x = Rc::new(5);
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let y = x.clone();
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assert_eq!(*x, 5);
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assert_eq!(*y, 5);
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}
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#[test]
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fn test_destructor() {
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let x: Rc<Box<_>> = Rc::new(box 5);
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assert_eq!(**x, 5);
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}
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#[test]
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fn test_live() {
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let x = Rc::new(5);
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let y = Rc::downgrade(&x);
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assert!(y.upgrade().is_some());
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}
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#[test]
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fn test_dead() {
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let x = Rc::new(5);
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let y = Rc::downgrade(&x);
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drop(x);
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assert!(y.upgrade().is_none());
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}
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#[test]
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fn weak_self_cyclic() {
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struct Cycle {
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x: RefCell<Option<Weak<Cycle>>>,
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}
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let a = Rc::new(Cycle { x: RefCell::new(None) });
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let b = Rc::downgrade(&a.clone());
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*a.x.borrow_mut() = Some(b);
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// hopefully we don't double-free (or leak)...
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}
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#[test]
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fn is_unique() {
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let x = Rc::new(3);
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assert!(Rc::is_unique(&x));
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let y = x.clone();
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assert!(!Rc::is_unique(&x));
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drop(y);
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assert!(Rc::is_unique(&x));
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let w = Rc::downgrade(&x);
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assert!(!Rc::is_unique(&x));
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drop(w);
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assert!(Rc::is_unique(&x));
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}
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#[test]
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fn test_strong_count() {
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let a = Rc::new(0);
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assert!(Rc::strong_count(&a) == 1);
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let w = Rc::downgrade(&a);
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assert!(Rc::strong_count(&a) == 1);
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let b = w.upgrade().expect("upgrade of live rc failed");
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assert!(Rc::strong_count(&b) == 2);
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assert!(Rc::strong_count(&a) == 2);
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drop(w);
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drop(a);
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assert!(Rc::strong_count(&b) == 1);
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let c = b.clone();
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assert!(Rc::strong_count(&b) == 2);
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assert!(Rc::strong_count(&c) == 2);
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}
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#[test]
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fn test_weak_count() {
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let a = Rc::new(0);
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assert!(Rc::strong_count(&a) == 1);
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assert!(Rc::weak_count(&a) == 0);
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let w = Rc::downgrade(&a);
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assert!(Rc::strong_count(&a) == 1);
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assert!(Rc::weak_count(&a) == 1);
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drop(w);
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assert!(Rc::strong_count(&a) == 1);
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assert!(Rc::weak_count(&a) == 0);
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let c = a.clone();
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assert!(Rc::strong_count(&a) == 2);
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assert!(Rc::weak_count(&a) == 0);
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drop(c);
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}
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#[test]
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fn weak_counts() {
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assert_eq!(Weak::weak_count(&Weak::<u64>::new()), 0);
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assert_eq!(Weak::strong_count(&Weak::<u64>::new()), 0);
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let a = Rc::new(0);
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let w = Rc::downgrade(&a);
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assert_eq!(Weak::strong_count(&w), 1);
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assert_eq!(Weak::weak_count(&w), 1);
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let w2 = w.clone();
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assert_eq!(Weak::strong_count(&w), 1);
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assert_eq!(Weak::weak_count(&w), 2);
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assert_eq!(Weak::strong_count(&w2), 1);
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assert_eq!(Weak::weak_count(&w2), 2);
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drop(w);
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assert_eq!(Weak::strong_count(&w2), 1);
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assert_eq!(Weak::weak_count(&w2), 1);
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let a2 = a.clone();
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assert_eq!(Weak::strong_count(&w2), 2);
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assert_eq!(Weak::weak_count(&w2), 1);
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drop(a2);
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drop(a);
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assert_eq!(Weak::strong_count(&w2), 0);
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assert_eq!(Weak::weak_count(&w2), 0);
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drop(w2);
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}
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#[test]
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fn try_unwrap() {
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let x = Rc::new(3);
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assert_eq!(Rc::try_unwrap(x), Ok(3));
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let x = Rc::new(4);
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let _y = x.clone();
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assert_eq!(Rc::try_unwrap(x), Err(Rc::new(4)));
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let x = Rc::new(5);
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let _w = Rc::downgrade(&x);
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assert_eq!(Rc::try_unwrap(x), Ok(5));
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}
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#[test]
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fn into_from_raw() {
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let x = Rc::new(box "hello");
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let y = x.clone();
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let x_ptr = Rc::into_raw(x);
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drop(y);
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unsafe {
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assert_eq!(**x_ptr, "hello");
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let x = Rc::from_raw(x_ptr);
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assert_eq!(**x, "hello");
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assert_eq!(Rc::try_unwrap(x).map(|x| *x), Ok("hello"));
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}
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}
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#[test]
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fn test_into_from_raw_unsized() {
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use std::fmt::Display;
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use std::string::ToString;
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let rc: Rc<str> = Rc::from("foo");
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let ptr = Rc::into_raw(rc.clone());
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let rc2 = unsafe { Rc::from_raw(ptr) };
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assert_eq!(unsafe { &*ptr }, "foo");
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assert_eq!(rc, rc2);
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let rc: Rc<dyn Display> = Rc::new(123);
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let ptr = Rc::into_raw(rc.clone());
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let rc2 = unsafe { Rc::from_raw(ptr) };
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assert_eq!(unsafe { &*ptr }.to_string(), "123");
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assert_eq!(rc2.to_string(), "123");
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}
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#[test]
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fn get_mut() {
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let mut x = Rc::new(3);
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*Rc::get_mut(&mut x).unwrap() = 4;
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assert_eq!(*x, 4);
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let y = x.clone();
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assert!(Rc::get_mut(&mut x).is_none());
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drop(y);
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assert!(Rc::get_mut(&mut x).is_some());
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let _w = Rc::downgrade(&x);
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assert!(Rc::get_mut(&mut x).is_none());
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}
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#[test]
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fn test_cowrc_clone_make_unique() {
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let mut cow0 = Rc::new(75);
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let mut cow1 = cow0.clone();
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let mut cow2 = cow1.clone();
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assert!(75 == *Rc::make_mut(&mut cow0));
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assert!(75 == *Rc::make_mut(&mut cow1));
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assert!(75 == *Rc::make_mut(&mut cow2));
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*Rc::make_mut(&mut cow0) += 1;
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*Rc::make_mut(&mut cow1) += 2;
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*Rc::make_mut(&mut cow2) += 3;
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assert!(76 == *cow0);
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assert!(77 == *cow1);
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assert!(78 == *cow2);
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// none should point to the same backing memory
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assert!(*cow0 != *cow1);
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assert!(*cow0 != *cow2);
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assert!(*cow1 != *cow2);
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}
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#[test]
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fn test_cowrc_clone_unique2() {
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let mut cow0 = Rc::new(75);
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let cow1 = cow0.clone();
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let cow2 = cow1.clone();
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assert!(75 == *cow0);
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assert!(75 == *cow1);
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assert!(75 == *cow2);
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*Rc::make_mut(&mut cow0) += 1;
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assert!(76 == *cow0);
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assert!(75 == *cow1);
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assert!(75 == *cow2);
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// cow1 and cow2 should share the same contents
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// cow0 should have a unique reference
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assert!(*cow0 != *cow1);
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assert!(*cow0 != *cow2);
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assert!(*cow1 == *cow2);
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}
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#[test]
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fn test_cowrc_clone_weak() {
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let mut cow0 = Rc::new(75);
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let cow1_weak = Rc::downgrade(&cow0);
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assert!(75 == *cow0);
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assert!(75 == *cow1_weak.upgrade().unwrap());
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*Rc::make_mut(&mut cow0) += 1;
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assert!(76 == *cow0);
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assert!(cow1_weak.upgrade().is_none());
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}
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#[test]
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fn test_show() {
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let foo = Rc::new(75);
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assert_eq!(format!("{:?}", foo), "75");
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}
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#[test]
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fn test_unsized() {
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let foo: Rc<[i32]> = Rc::new([1, 2, 3]);
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assert_eq!(foo, foo.clone());
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}
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#[test]
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fn test_from_owned() {
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let foo = 123;
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let foo_rc = Rc::from(foo);
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assert!(123 == *foo_rc);
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}
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#[test]
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fn test_new_weak() {
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let foo: Weak<usize> = Weak::new();
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assert!(foo.upgrade().is_none());
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}
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#[test]
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fn test_ptr_eq() {
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let five = Rc::new(5);
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let same_five = five.clone();
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let other_five = Rc::new(5);
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assert!(Rc::ptr_eq(&five, &same_five));
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assert!(!Rc::ptr_eq(&five, &other_five));
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}
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#[test]
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fn test_from_str() {
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let r: Rc<str> = Rc::from("foo");
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assert_eq!(&r[..], "foo");
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}
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#[test]
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fn test_copy_from_slice() {
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let s: &[u32] = &[1, 2, 3];
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let r: Rc<[u32]> = Rc::from(s);
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assert_eq!(&r[..], [1, 2, 3]);
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}
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#[test]
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fn test_clone_from_slice() {
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#[derive(Clone, Debug, Eq, PartialEq)]
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struct X(u32);
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let s: &[X] = &[X(1), X(2), X(3)];
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let r: Rc<[X]> = Rc::from(s);
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assert_eq!(&r[..], s);
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}
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#[test]
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#[should_panic]
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fn test_clone_from_slice_panic() {
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use std::string::{String, ToString};
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struct Fail(u32, String);
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impl Clone for Fail {
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fn clone(&self) -> Fail {
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if self.0 == 2 {
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panic!();
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}
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Fail(self.0, self.1.clone())
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}
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}
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let s: &[Fail] =
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&[Fail(0, "foo".to_string()), Fail(1, "bar".to_string()), Fail(2, "baz".to_string())];
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// Should panic, but not cause memory corruption
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let _r: Rc<[Fail]> = Rc::from(s);
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}
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#[test]
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fn test_from_box() {
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let b: Box<u32> = box 123;
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let r: Rc<u32> = Rc::from(b);
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assert_eq!(*r, 123);
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}
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#[test]
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fn test_from_box_str() {
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use std::string::String;
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let s = String::from("foo").into_boxed_str();
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let r: Rc<str> = Rc::from(s);
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assert_eq!(&r[..], "foo");
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}
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#[test]
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fn test_from_box_slice() {
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let s = vec![1, 2, 3].into_boxed_slice();
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let r: Rc<[u32]> = Rc::from(s);
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assert_eq!(&r[..], [1, 2, 3]);
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}
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#[test]
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fn test_from_box_trait() {
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use std::fmt::Display;
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use std::string::ToString;
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let b: Box<dyn Display> = box 123;
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let r: Rc<dyn Display> = Rc::from(b);
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assert_eq!(r.to_string(), "123");
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}
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#[test]
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fn test_from_box_trait_zero_sized() {
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use std::fmt::Debug;
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let b: Box<dyn Debug> = box ();
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let r: Rc<dyn Debug> = Rc::from(b);
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assert_eq!(format!("{:?}", r), "()");
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}
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#[test]
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fn test_from_vec() {
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let v = vec![1, 2, 3];
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let r: Rc<[u32]> = Rc::from(v);
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assert_eq!(&r[..], [1, 2, 3]);
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}
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#[test]
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fn test_downcast() {
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use std::any::Any;
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let r1: Rc<dyn Any> = Rc::new(i32::max_value());
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let r2: Rc<dyn Any> = Rc::new("abc");
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assert!(r1.clone().downcast::<u32>().is_err());
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let r1i32 = r1.downcast::<i32>();
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assert!(r1i32.is_ok());
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assert_eq!(r1i32.unwrap(), Rc::new(i32::max_value()));
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assert!(r2.clone().downcast::<i32>().is_err());
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let r2str = r2.downcast::<&'static str>();
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assert!(r2str.is_ok());
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assert_eq!(r2str.unwrap(), Rc::new("abc"));
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}
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#[test]
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fn test_array_from_slice() {
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let v = vec![1, 2, 3];
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let r: Rc<[u32]> = Rc::from(v);
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let a: Result<Rc<[u32; 3]>, _> = r.clone().try_into();
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assert!(a.is_ok());
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let a: Result<Rc<[u32; 2]>, _> = r.clone().try_into();
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assert!(a.is_err());
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}
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