[gnufx]

If you're doing combinator parsing, the offside combinator is a few lines. I have one in front of me as part of a demo Haskell-like syntax for Scheme as a command processor. You have to tag the lexemes with position information, but you presumably want that for error-reporting anyhow.

[As others have pointed out, you get the choice of layout in Haskell syntaxes and, as it happens, that Scheme syntax also allowed you to use sexp input.]