I checked out your answer, I have meet all your said requirements. GHCi,
inf-haskell (after I installed package haskell-mode) and setting
`haskell-program-name`, I found there is no `defcustom` variable option
named `haskell-program-name` at all.

[stardiviner]           <Hack this world!>      GPG key ID: 47C32433
IRC(freeenode): stardiviner                     Twitter:  @numbchild
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Blog: http://stardiviner.github.io/

On Wed, Nov 15, 2017 at 9:17 PM, numbchild@gmail.com <numbchild@gmail.com>
wrote:

> I required `(require 'inf-haskell)` But have not found the command
> `inf-haskell` to start inferior process.
>
> [stardiviner]           <Hack this world!>      GPG key ID: 47C32433
> IRC(freeenode): stardiviner                     Twitter:  @numbchild
> Key fingerprint = 9BAA 92BC CDDD B9EF 3B36  CB99 B8C4 B8E5 47C3 2433
> Blog: http://stardiviner.github.io/
>
> On Mon, Nov 13, 2017 at 11:43 PM, Nick Dokos <ndokos@gmail.com> wrote:
>
>> stardiviner <numbchild@gmail.com> writes:
>>
>> > When I execute the following Haskell src block:
>> >
>> > ```
>> >
>> > #+BEGIN_SRC haskell :session :tangle "Data/Code/hello_world.hs"
>> > main :: IO ()
>> > main = do
>> >   putStrLn "Hello, World!"
>> > #+END_SRC
>> >
>> > ```
>> >
>> > It reports error:
>> >
>> > ```
>> >
>> > Debugger entered--Lisp error: (file-missing "Cannot open load file" "No
>> > such file or directory" "inf-haskell")
>> >   require(inf-haskell)
>>
>> See my answer to this SO question:
>>
>>   https://stackoverflow.com/questions/42081379/how-to-set-up-
>> org-babel-for-haskell-with-stack
>>
>> for some details on setting up the environment.
>>
>> --
>> Nick
>>
>>
>>
>