gistfile1.txt

      // 1. Must only say "ClientError::IndexParseError" ONCE.
      // 2. Must return Result<usize, ClientError::IndexParseError>
      // 3. No nesting blocks
      let last_id = document.select("div.cart:nth-child(1)")
        .ok()
        .and_then(|mut x| x.next() )
        .and_then(|x| {
          x.attributes
          .borrow()
          .get("id")
          .and_then(|x: &str| Self::get_last_id(x).ok() )
        } )
        .ok_or( ClientError::IndexParseError )?;

pub fn get_last_id(t: &str) -> Result<usize,ClientError> {