Sanity checker false positive (presumably)

When trying to debug an unrelated problem, I found a Sanity Checker failure. Initially I though this was my bug, but it remained after I left the bug. I stripped the program right down to a minimal example which still causes sanity check failures.

import Graphics.Rendering.OpenGL
import Graphics.UI.GLUT

main = do
  (progName,args) <-  getArgsAndInitialize
  createWindow progName
  displayCallback $= display
  display

display = color $ Color4 1 0 0 (1::GLfloat)
  
  
{-

On my machine this reliably trips the sanity checker:

jules$ ghc -debug -fforce-recomp --make sanityminimal.hs  && ./sanityminimal +RTS -DS
[1 of 1] Compiling Main             ( sanityminimal.hs, sanityminimal.o )
Linking sanityminimal ...
sanityminimal: internal error: ASSERTION FAILED: file Sanity.c, line 241

    (GHC version 6.8.3 for i386_apple_darwin)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Abort trap

-}

I am running 6.8.3 here but I got someone to test 6.10.1 with the same result.

Trac metadata

Trac field	Value
Version	6.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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