I want to vote, too.
I am ok with all of
case of
\case
\of
\case of
For me single arguments are enough. We already have this restriction for 'case'
and I can work around it simply by wrapping arguments in pairs temporarily (cf.
curry $ \case ...).
I vote against LambdaIf, since if-then-else is already unnecessary and can be
written by ifThenElse, and LambdaIf is just ifThenElse with different parameter
order.
I vote against MultiCaseIf since it can be simply achieved by
ifThenElse b1 a1 $
ifThenElse b2 a2 $
ifThenElse b3 a3 $
a4
http://www.haskell.org/haskellwiki/Case
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