The &const Rust previously had doesn’t solve the problem, since you can’t use fn find(&const self, key: uint) -> &const X to get either a & out (if called on an & receiver) or a &mut (for a &mut receiver), you always get a &const out.
The &const Rust previously had doesn’t solve the problem, since you can’t use fn find(&const self, key: uint) -> &const X to get either a & out (if called on an & receiver) or a &mut (for a &mut receiver), you always get a &const out.