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Panic with overloaded quotations

ghc: panic! (the 'impossible' happened)
  (GHC version 8.11.0.20200213:
	compiler/deSugar/DsMeta.hs:2126:5-46: Non-exhaustive patterns in (_, [elt_ty])


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

Program:

https://gist.github.com/mpickering/dcc9403b0348dc481e47fe28ed093305

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