rustc disapproves. once_entry.rs:40:16: 40:61 error: mismatched types: expected `~str` but found `&str` (str storage differs: expected ~ but found &) once_entry.rs:40 adj_str = adj_str.slice_chars(1, adj_str.char_len()-1); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

once_entry.rs

  pub fn parse(munny: &Munny, day: &time::Tm, tokens: &mut ~[~str]) {
    if tokens.len() < 1 {
      fail!("Too few arguments!")
    }

    // Pop adjustment string.
    let mut set = false;
    let mut adj_str = vec::pop(tokens);
    
    // See if there's a '=' preceding it. If so, note that and slice it.
    if adj_str.starts_with("=") {
      set = true;
      adj_str = adj_str.slice_chars(1, adj_str.char_len()-1);
    }

    // Parse adjustment amount.
    match f64::from_str(adj_str) {
      Some(adj) => { fail!("FIXME"); }
      None => { fail!("Once adjustment not a proper f64!"); }
    }

    // Create Once instance and add to entries set.
    fail!(~"FIXME");
  }