Interactive shell

[Mark Carroll]

People may recall that I was looking for an interactive Haskell shell at
which I could type things and experiment, as you'd expect to get with any
Lisp environment.

At people's suggestion I installed GHCi and got it working, but I seem
quite limited in what I can type at it. For instance, it balks at my
various attempts to define a new algebraic type along the lines of "data
Foo = Bar | Baz", for use in future intercourse. Is there some magical
incantation I'm missing, or does it really not let me do that, and if not
then does anything else?

Thanks.

-- Mark