the emacs lisp you use with it?
Well, to see any effect you have to select submode class (C-c % C-c).
I used CWEB submode class which shipped with mmm-mode. Defining new
submode is pretty easy - look at the documentation which comes with
mmm-mode and examples (on my machine they are in
/usr/share
Conal> ("||)" and maybe inline verbatim ("@@") as Haskell
Conal> rather than LaTeX code.
May be mmm-mode will help you, I haven't tried the combination
mmm-mode+latex-mode+haskell-mode. AFAIU it should work (I used
mmm-mode with cweb
