Binding ImplicitParams in lambda results in parse error

ImplicitParams currently do not play well with lambdas :(

Steps to reproduce

Create a file Foo.hs with the following content:

{-# LANGUAGE ImplicitParams #-}

import Control.Monad

foo :: (?bar :: Int) => IO ()
foo = print ?bar

main = do
  forM_ [1..3] $ \ ?bar -> foo

Expected result

$ runhaskell Foo.hs 
1
2
3

Actual result

$ runhaskell Foo.hs

Foo.hs:9:21: Parse error in pattern: ?bar

Trac metadata

Trac field	Value
Version	7.8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
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