stack ghci does not load local module but ghci does - haskell-stack

Question

This is similar to the question at
stack ghci not loading up local modules?
but not exactly the same.
I have a directory with the files Main.hs and Shapes.hs where Main.hs has a reference to the module Shapes.
If I run
ghci Main.hs
everything works fine. This is version 7.10.
But if I run, in version 8,
stack ghci
:load Main.hs
I get the error
[1 of 1] Compiling Main ( Main.hs, interpreted )
Main.hs:3:1: error:
Failed to load interface for ‘Shapes’
It is not a module in the current program, or in any known package.
Failed, modules loaded: none.
I tried the solution on the link
:load Shapes.hs Main.hs
but it still does not work. I get the error
[1 of 2] Compiling Shapes ( Shapes.hs, interpreted )
[2 of 2] Compiling Main ( Main.hs, interpreted )
Main.hs:1:1: error:
The IO action ‘main’ is not defined in module ‘Main’
Failed, modules loaded: Shapes.
I found the following which discusses this second matter:
How to avoid "‘main’ is not defined in module ‘Main’" when using syntastic
But if I were to put in
main :: IO ()
in the Main.hs file, I still get errors. If I were to additionally add the line
main = return ()
and have these two additional lines at the end, then it would load. But after loading it just exits main and I no longer have access to the functions in main.
I don't see any reason why I need to use any IO features when I import some other module. How do I, in version 8, load a local module without using IO?

Answer 1

I fixed my own problem. There was a line in Main.hs at the top called
module Main where
that I removed. Now it works if I load in stack ghci with
:l Main.hs Shapes.hs