Add Result::cloned{,_err} and Result::copied{,_err}
Add Result::cloned{,_err} and Result::copied{,_err}

aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust