Request for input on #7253: Top-level bindings in GHCI

[Alex Rozenshteyn]

I'm thinking of working on this ticket (
https://ghc.haskell.org/trac/ghc/ticket/7253), so, as per mpickering's
suggestion (https://phabricator.haskell.org/chatlog/channel/3/?at=1353572),
I'm emailing the list to solicit input.

My first instinct was to treat declarations like "a = 1" in GHCI as
equivalent to "let a = 1"; this would be a straightforward matter of
parsing. On the other hand, as thoughtpolice comments, let-bound variables
are treated subtly differently than top-level bindings, so the proper
solution may be more involved.

Comments?
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