Something amiss in TH instantiation?

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+### Please describe the problem.
+
+git-annex fails to build in the NixOS builder
+
+### What steps will reproduce the problem?
+
+cabal build
+
+### What version of git-annex are you using? On what operating system?
+
+5.20150812
+
+### Please provide any additional information below.
+
+[The build log](http://hydra.cryp.to/build/1099681/nixlog/1/raw) has a full transcript of the build from one of the build machines, though I have reproduced this locally.
+
+The pertinent bit of the log (which is *not* at the end, though I think that's just a capture-both-stderr-and-stdin thing, since it was at the end when I repro'd it:
+
+[[!format sh """
+Assistant/WebApp/Types.hs:39:1: ‘WebApp’ is not in scope at a reify
+"""]]
+
+If I'm reading things correctly (you can do some diffing of the inputs from [the page for the build](http://hydra.cryp.to/build/1099681)), I'm going to guess that it was the upgrade to yesod-1.4.14.
+
+I'll continue to look into it, but it would seem to touch on TH and Yesod stuff with which I am largely unfamiliar.