Running ghci without any option or scripts to load, I've experienced
some inconsistencies prelude List.\\ and List.(\\) .  The former is in
scope, but the latter is not.  This seem strange.  My expectation is
that neither of them should be in scope unless we load the List module
with with the :m command.

I'm using Debian distribution of GHC 6.10.4, and here is an example run
of ghci to show this issue.

kyagrd@kyagrd:~/tmp$ ghci
GHCi, version 6.10.4: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
Prelude> [1,2,3,4] List.\\ [1,3]
[2,4]
Prelude> List.(\\) [1,2,3,4] [1,3]

<interactive>:1:0: Not in scope: data constructor `List'

<interactive>:1:5: Not in scope: `\\'
Prelude> :q
Leaving GHCi.
kyagrd@kyagrd:~/tmp$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.10.4
kyagrd@kyagrd:~/tmp$ uname -a
Linux kyagrd 2.6.30-2-686 #1 SMP Sat Sep 26 01:16:22 UTC 2009 i686 GNU/Linux

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