Master recently broke on OS X

[Ben Gamari]

Hello Simon,

It looks like one of the patches that you pushed to master today may
have broken the build on OS X. According to Harbormaster something in
the range of f148513ccd93..7129861397f8 caused T5611 to fail on the OS X
build bot [1]. Could you have a look?

Cheers,

- Ben


[1] https://phabricator.haskell.org/harbormaster/build/14220/?l=100
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