[Haskell-beginners] Fwd: Factor out parsec types

Hi Francesco. If I understand correctly the parsec interface, leaving the stream type s as a type variable allows me to specify the concrete stream type at the time of use without changing the parser, as long as that stream gives Char tokens, is that correct ? And using a concrete stream type forfeit that, does'nt it ? (So for example in Quickcheck tests in can just use a String as my stream, and in other contexts something like Text). (I have not really experimented yet with the various "string" type, so maybe this is unnecessary (but in that case, what is the point of ParsecT exposing these type parameters ?)) The main purpose of my project is to learn Haskell, so I'm trying to understand the full power of the tools I use^ .