recomp001 failing on OSX for Phab:D2853

[Luke Maurer]

Getting an odd test failure from Phab:

@@ -1,2 +0,0 @@
-
-C.hs:3:11: Module ‘B’ does not export ‘foo’
Actual stderr output differs from expected:
*** unexpected failure for recomp001(normal)

https://phabricator.haskell.org/harbormaster/build/18499/?l=0

I can't explain how my changes would break module exports *at all,* much 
less only on OSX. Found a Mac (running Mavericks and GHC 8.0.1) but 
couldn't reproduce it there. Thoughts? I'd love to nail this as soon as 
possible so I can get join points in before the feature freeze ...

- Luke Maurer
University of Oregon
maurerl at cs.uoregon.edu
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