[ghci] Comparison with Hugs

[Volker Stolz]

In Hugs I can throw some definitions into a file and load it
on the shell command line or using ":l" in Hugs.

ghci however will complain that "main" is missing and even won't keep
the defined functions in scope. Is there anything I can do about that?
It even doesn't invoke main if it's present.

I could hack ghci do add "main = print 1" in case main is undefined,
but that's not really something I'd like to admit afterwards...
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