[Haskell-beginners] Return function

[Kim-Ee Yeoh]

> My guess is that you are running it in GHCi, which means that
> it gets coerced to the IO monad.
>

"Coercion" doesn't quite capture it. Also it happens that the haskell
research literature uses it in a technically specific context that doesn't
apply here.

What's going on in

return (Just 3)

being _executed_ in ghci to produce

Just 3

is the REPL's defaulting to IO kicking in.

p.s. In the above, I've made distinct execution from evaluation. This helps
folks navigate the beginner-hazardous terrain of overloaded English.

-- Kim-Ee
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