ghc panic: ieName failed pattern match (-fwarn-missing-exported-sigs)

My custom prelude module is producing the following panic in ghc:

<no location info>:
    ghc: panic! (the 'impossible' happened)
  (GHC version 7.10.2 for x86_64-unknown-linux):
        ieName failed pattern match!

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

The module is as follows:

module Prelude
( module X
, tshow
) where

import BasePrelude as X
import Data.Text as X (Text, pack, unpack)

tshow :: Show a => a -> Text
tshow = pack . show

In my cabal file I depend on base-noprelude and base-prelude and use the above as my custom Prelude module. The panic is triggered by tshow.

Trac metadata

Trac field	Value
Version	7.10.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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