// with inherited mutability and with `&mut`
// pointers.
LpExtend(ref lp_base, mc::McInherited, _) |
+ LpExtend(ref lp_base, _, LpDeref(mc::OwnedPtr)) |
+ LpExtend(ref lp_base, _, LpDeref(mc::GcPtr)) |
LpExtend(ref lp_base, _, LpDeref(mc::BorrowedPtr(ty::MutBorrow, _))) => {
lp_base.clone()
}
--- /dev/null
+// Copyright 2014 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.
+
+// This tests that we can't modify Box<&mut T> contents while they
+// are borrowed.
+
+struct A { a: int }
+struct B<'a> { a: Box<&'a mut int> }
+
+fn borrow_in_var_from_var() {
+ let mut x: int = 1;
+ let y = box &mut x;
+ let p = &y;
+ let q = &***p;
+ **y = 2; //~ ERROR cannot assign to `**y` because it is borrowed
+ drop(p);
+ drop(q);
+}
+
+fn borrow_in_var_from_field() {
+ let mut x = A { a: 1 };
+ let y = box &mut x.a;
+ let p = &y;
+ let q = &***p;
+ **y = 2; //~ ERROR cannot assign to `**y` because it is borrowed
+ drop(p);
+ drop(q);
+}
+
+fn borrow_in_field_from_var() {
+ let mut x: int = 1;
+ let y = B { a: box &mut x };
+ let p = &y.a;
+ let q = &***p;
+ **y.a = 2; //~ ERROR cannot assign to `**y.a` because it is borrowed
+ drop(p);
+ drop(q);
+}
+
+fn borrow_in_field_from_field() {
+ let mut x = A { a: 1 };
+ let y = B { a: box &mut x.a };
+ let p = &y.a;
+ let q = &***p;
+ **y.a = 2; //~ ERROR cannot assign to `**y.a` because it is borrowed
+ drop(p);
+ drop(q);
+}
+
+fn main() {
+ borrow_in_var_from_var();
+ borrow_in_var_from_field();
+ borrow_in_field_from_var();
+ borrow_in_field_from_field();
+}
+