title: Composition operator and pipe forward operator in Rust
body: <p>Do both the composition and pipe forward operators (<a href="http://blogs.msdn.com/b/chrsmith/archive/2008/06/14/function-composition.aspx">like in other languages</a>) exist in Rust? If so, what do they look like and one should one be preferred to the other? If one does not exist, why is this operator not needed?</p>