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th-build in GHCi: phase `C pre-processor' failed (exitcode = 1)

Hi, excellent package you have here. Works perfectly (with some version bumps) when I compile it with GHC 7.10. However when I attempt to use a piece of code using your package in GHCi I get this error:

$> stack repl
GHCi, version 7.10.2: http://www.haskell.org/ghc/  :? for help
unknown option: 'c'
gcc: fatal error: cannot specify -o with -c, -S or -E with multiple files
compilation terminated.
phase `C pre-processor' failed (exitcode = 1)
λ>

The code looks like:

{-# LANGUAGE TemplateHaskell #-}
module Main where

import Language.Haskell.TH
import Language.Haskell.TH.Build

mkExpr :: forall a. Ppr a => Q a -> IO String
mkExpr = (return . pprint =<<) . runQ

testVal = valD' "foo" (appE' 'not 'True) ()

main :: IO ()
main = putStrLn =<< mkExpr testVal

When I compile it, I get exactly what you would expect:

foo = GHC.Classes.not GHC.Types.True

But GHCi complains.

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