> Currently what I do is declare a signature for helper, and then if it
> gets a type error try to figure out how to fix it. It's usually not
> very hard, but it would be slick to have the signature filled in
> automatically.
Try ghc-mod on Hackage if you are an Emacs user.
If GHC can guess the signature of helper function, haskell-mode with
ghc-mod automatically hilights the function. Typing C-cC-t inserts the
guessed signature.
http://www.mew.org/~kazu/proj/ghc-mod/en/
--Kazu
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