TH mkName bug

This is accepted:

{-# LANGUAGE TemplateHaskell #-}

import Language.Haskell.TH

f :: Maybe Int -> Int
f Nothing = 3
f (Just x) = $(varE (mkName "x"))

but this fails:

{-# LANGUAGE TemplateHaskell #-}

import Language.Haskell.TH

$( do ds <- [d|
                f :: Maybe Int -> Int
                f Nothing = 3
                f (Just x) = $(varE (mkName "x"))
              |]
      runIO $ putStrLn $ pprint ds
      return ds )

with:

f :: Data.Maybe.Maybe GHC.Types.Int -> GHC.Types.Int
f (Data.Maybe.Nothing) = 3
f (Data.Maybe.Just x_0) = x

q.hs:5:4: Not in scope: `x'

I expect it to be accepted.

Trac metadata

Trac field	Value
Version	7.0.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Template Haskell
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