Do not filter the type envt after each GHCi stmt
Fixes Trac #925 A new comment in TcRnDriver in tcRnStmt reads thus: At one stage I removed any shadowed bindings from the type_env; they are inaccessible but might, I suppose, cause a space leak if we leave them there. However, with Template Haskell they aren't necessarily inaccessible. Consider this GHCi session Prelude> let f n = n * 2 :: Int Prelude> fName <- runQ [| f |] Prelude> $(return $ AppE fName (LitE (IntegerL 7))) 14 Prelude> let f n = n * 3 :: Int Prelude> $(return $ AppE fName (LitE (IntegerL 7))) In the last line we use 'fName', which resolves to the *first* 'f' in scope. If we delete it from the type env, GHCi crashes because it doesn't expect that.
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