Suggest LambdaCase

When I say

module Bug where

foo = \case True -> False
            False -> True

I get

Bug.hs:9:7: error: parse error: naked lambda expression ''

We can do far better. Setting priority to high because it's rather embarrassing to let your lambdas run around naked.

Trac metadata

Trac field	Value
Version	7.10.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler (Parser)
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