Reifying the nullary unboxed tuple is broken

Here is my code:

{-# LANGUAGE TemplateHaskell, UnboxedTuples #-}

module Bug where

import Language.Haskell.TH

$( do _ <- reify ''(##)
      return [] )

And here is GHC's response:

    Can't find interface-file declaration for type constructor or class GHC.Prim.(##)
      Probable cause: bug in .hi-boot file, or inconsistent .hi file
      Use -ddump-if-trace to get an idea of which file caused the error

Non-nullary unboxed tuples behave fine. This behavior is the same whether or not there is a space in the nullary unboxed tuple.

Believe me -- I actually was just bit by this bug. I'm happy to fix, but could someone give me a pointer as to where the problem might be? I have the feeling someone reading this will know quite quickly.

Trac metadata

Trac field	Value
Version	7.8.1-rc2
Type	Bug
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Template Haskell
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture