rust-lang/rust — pull request #19561 by csouth3 (2014-12-05 07:19:05+00:00)
Title: Implement BitOps for TreeSet

Implement the `BitOr`, `BitAnd`, `BitXor`, and `Sub` traits from `std::ops` for TreeSet. The behavior of these operator overloads is consistent with [RFC 235](https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#combinations).

r? @Gankro