`simhash::hash` requires a `&str`

html.rs

extern crate simhash;
use std::sync::Future;

/// DOM Tree
pub struct Tree {
  html: String,
  pub hash: Future<u64>
}

impl Tree {
  pub fn new(html: String) -> Tree {
    Tree {
      html: html,
      hash: Future::spawn(proc() { simhash::hash(html.as_slice()) })
    }
  }
}

html.rs:13:13: 13:17 note: html moved here because it has type collections::string::String, which is non-copyable (perhaps you meant to use clone()?)