test_json_dir not in scope

[Abhiroop]

Hello,

Attempting to stack build this project throws the following error:

embeddedHaskellAetherling/src/Core/Aetherling/Interpretations/Backend_Execute/Test_Helpers.hs:232:27: error:

    Variable not in scope: test_json_dir :: [Char]
    |
232 |   let test_file_prelude = test_json_dir ++ test_name
    |                           ^^^^^^^^^^^^^

To finish the build I added

test_json_dir = ""

to the complaining file and the project seems to build fine. However it is not clear what is test_json_dir used for.