GHC panic when compiling Yesod app

When compiling a Yesod app, using 'yesod devel', GHC crashes with the following error:

<no location info>:
    ghc: panic! (the 'impossible' happened)
  (GHC version 7.10.1 for x86_64-apple-darwin):
	Loading temp shared object failed: dlopen(/var/folders/yb/98yhr6bj5fg3z68prq2gxs6w0000gn/T/ghc99761_0/libghc99761_51.dylib, 5): Symbol not found: _adverzuGWP0VNzzhgmvBNANratclKO_SubscriptionType_zdfPersistFieldKey_closure
  Referenced from: /var/folders/yb/98yhr6bj5fg3z68prq2gxs6w0000gn/T/ghc99761_0/libghc99761_51.dylib
  Expected in: flat namespace
 in /var/folders/yb/98yhr6bj5fg3z68prq2gxs6w0000gn/T/ghc99761_0/libghc99761_51.dylib

Specifically, I'm using Yesod's mkPersist to create a data type, and it works fine, until I make said type an instance of FromJSON, in which case the above panic occurs.

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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