Actually the last two `.iter()` aren't needed at all because of IntoIter. All three can all be removed if you use Itertools' izip! let codes: Vec<_> =

Actually the last two `.iter()` aren't needed at all because of IntoIter. All three can all be removed if you use Itertools' izip! let codes: Vec<_> = izip!(&data_table, code_lengths, code_table) .map(|(&value, length, code)| { HuffmanCode { length: length, code: code, value: value, } }) .collect(); (If HuffmanCode was a tuple type, this could even be #![feature(fn_traits)] let codes: Vec<_> = izip!(data_table.iter().cloned(), code_lengths, code_table) .map(|args| (&HuffmanCode).call(args)) .collect(); but now I'm just playing around.)