Auto merge of #39287 - wesleywiser:move_cell, r=aturon

Extend Cell to work with non-Copy types

I'm not sure that I did this right but all of the tests pass.

I also had to move the `new()` function so that `Cell`s with non-`Copy` `T`s could be created. That wasn't in the RFC but I assume it needed to be done?

2 files changed, 32 insertions, 0 deletions

diff --git a/src/libcoretest/cell.rs b/src/libcoretest/cell.rs
index 724a312ea79..8585f2f0871 100644
--- a/src/libcoretest/cell.rs
+++ b/src/libcoretest/cell.rs
@@ -210,6 +210,37 @@ fn cell_default() {
 }
 
 #[test]
+fn cell_set() {
+    let cell = Cell::new(10);
+    cell.set(20);
+    assert_eq!(20, cell.get());
+
+    let cell = Cell::new("Hello".to_owned());
+    cell.set("World".to_owned());
+    assert_eq!("World".to_owned(), cell.into_inner());
+}
+
+#[test]
+fn cell_replace() {
+    let cell = Cell::new(10);
+    assert_eq!(10, cell.replace(20));
+    assert_eq!(20, cell.get());
+
+    let cell = Cell::new("Hello".to_owned());
+    assert_eq!("Hello".to_owned(), cell.replace("World".to_owned()));
+    assert_eq!("World".to_owned(), cell.into_inner());
+}
+
+#[test]
+fn cell_into_inner() {
+    let cell = Cell::new(10);
+    assert_eq!(10, cell.into_inner());
+
+    let cell = Cell::new("Hello world".to_owned());
+    assert_eq!("Hello world".to_owned(), cell.into_inner());
+}
+
+#[test]
 fn refcell_default() {
     let cell: RefCell<u64> = Default::default();
     assert_eq!(0, *cell.borrow());
diff --git a/src/libcoretest/lib.rs b/src/libcoretest/lib.rs
index 8e5893b5ecb..87f3afd6889 100644
--- a/src/libcoretest/lib.rs
+++ b/src/libcoretest/lib.rs
@@ -33,6 +33,7 @@
 #![feature(unique)]
 #![feature(ordering_chaining)]
 #![feature(ptr_unaligned)]
+#![feature(move_cell)]
 
 extern crate core;
 extern crate test;