From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <ndokos@gmail.com>
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Date: Mon, 04 Jun 2018 14:01:40 -0400
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Roger Mason <rmason@mun.ca> writes:

> Hello,
>
> GNU Emacs 25.3.1 (i386-portbld-freebsd11.1, GTK+ Version
> 3.22.29) of 2018-04-26
>
> Org mode version 9.1.13 (release_9.1.13-784-ged7d1d @ /home/rmason/.emacs.d/org-git/lisp/)
>
> Attempting to run a haskell code block:
>
> #+begin_src haskell :exports results 
> cations=["Na","Mg","Al","Si","K","Ti","Fe"]
> atwt=[22.9897,24.305,26.9815,28.0855,39.0983,47.867,55.845]
> nanmol=[1,1,3,2,1,2,3]
> ncatmol=[2,1,2,1,2,1,2]
> anwt= replicate (length atwt) 15.9994
> #+end_src
>
> gives this message:
> executing Haskell code block...
> run-hooks: Symbol’s value as variable is void: haskell-prompt-regexp
>
> Any help in solving this will be most appreciated.
>

Try evaluating

(require 'inf-haskell)

and then try evaluating the source code block again.

Untested.
-- 
Nick

"There are only two hard problems in computer science: cache
invalidation, naming things, and off-by-one errors." -Martin Fowler