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Regression: cabal install of numeric-prelude hangs

While trying to do cabal install species with HP 7.10.2rc2 I discovered that it hangs compiling numeric-prelude in src/Algebra/RealRing.h. It doesn't seem to be busy computing as cpu usage is 0%. It also hangs with HP 7.10.1.20150612 but works with HP 7.10.1.20150601

ghc -V
The Glorious Glasgow Haskell Compilation System, version 7.10.1.20150630
cabal install --verbose=3 numeric-prelude
...
[39 of 97] Compiling Algebra.RealRing ( src/Algebra/RealRing.hs, dist/build/Algebra/RealRing.o )
...

Result size of Float out(FOS {Lam = Just 0,
                              Consts = True,
                              OverSatApps = True})
  = {terms: 3,506, types: 3,224, coercions: 4}
*** Common sub-expression:
Result size of Common sub-expression
Edited by george.colpitts