[Haskell-beginners] Latest ghci on Ubuntu 16.10?

[Lawrence Bottorff]

I'm on Ubuntu 16.10 and I've followed this
<https://docs.haskellstack.org/en/stable/install_and_upgrade/#linux>, but
now I have ghci 7.10.3, which still needs the the "let" in front of every
function for use in places like Emacs org-mode's babel. Here's an example
of what I have to do in org-mode to get it to run:

#+begin_src haskell
:set +m
let doubleSmallNumber4 x = if x > 0
                            then x
                             else x*2

doubleSmallNumber4 42
#+end_src

I've heard that an 8.+ version of ghci eliminates this issue. Is this true?
If so, how can I upgrade my "stack."

LB
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