Report of GHC Panic loading temp shared object

I'll just copy here the error message; I wouldn't say I have the judgement to interpret it:

''ghc: panic! (the 'impossible' happened)
  (GHC version 7.10.1 for x86_64-apple-darwin):
	Loading temp shared object failed: dlopen(/var/folders/84/5rj51n8x70g4km60lfh_ds1m0000gt/T/ghc22694_0/libghc22694_107.dylib, 5): Symbol not found: _AlexSzuELoZZpfyhWUk8IXGTl3Kiel_ModulesziDBTypes_zdfPersistFieldLinkTag_closure
  Referenced from: /var/folders/84/5rj51n8x70g4km60lfh_ds1m0000gt/T/ghc22694_0/libghc22694_107.dylib
  Expected in: flat namespace
 in /var/folders/84/5rj51n8x70g4km60lfh_ds1m0000gt/T/ghc22694_0/libghc22694_107.dylib

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug''

This occurred while interactively developing a website with "yesod devel". After the compiler crashed, I killed the program, invoked "yesod devel" again without changing anything in my source code. This next time, no error occurred.