Reborrow even when passing &Object to &Object, so as to permit freezing

1 files changed, 48 insertions, 0 deletions

diff --git a/src/test/run-pass/objects-coerce-freeze-borrored.rs b/src/test/run-pass/objects-coerce-freeze-borrored.rs
new file mode 100644
index 00000000000..4dda5ca556e
--- /dev/null
+++ b/src/test/run-pass/objects-coerce-freeze-borrored.rs
@@ -0,0 +1,48 @@
+// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Test that we can coerce an `@Object` to an `&Object`
+
+trait Foo {
+    fn foo(&self) -> uint;
+    fn bar(&mut self) -> uint;
+}
+
+impl Foo for uint {
+    fn foo(&self) -> uint {
+        *self
+    }
+
+    fn bar(&mut self) -> uint {
+        *self += 1;
+        *self
+    }
+}
+
+fn do_it_mut(obj: &mut Foo) {
+    let x = obj.bar();
+    let y = obj.foo();
+    assert_eq!(x, y);
+
+    do_it_imm(obj, y);
+}
+
+fn do_it_imm(obj: &Foo, v: uint) {
+    let y = obj.foo();
+    assert_eq!(v, y);
+}
+
+fn main() {
+    let mut x = 22_u;
+    let obj = &mut x as &mut Foo;
+    do_it_mut(obj);
+    do_it_imm(obj, 23u);
+    do_it_mut(obj);
+}