Core lint error after desugaring

I was investigating a "PAP object entered!" crash and found out that almost every module in my program fails to compile with -dcore-lint. I'll attach a reduced test case that reproduces the issue:

$ ghc-7.3.20110912 -fforce-recomp -dcore-lint Bug.hs
[1 of 1] Compiling Bug              ( Bug.hs, Bug.o )
*** Core Lint errors : in result of Desugar ***
{-# LINE 113 "Bug.hs #-}:
    [in body of lambda with binder temp_ahE :: Bug.HElemOf
                                                 (GHC.Types.Int
                                                  Bug.:* ([GHC.Types.Char] Bug.:* Bug.HNil))]
...

Trac metadata

Trac field	Value
Version	7.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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