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Error: expectJust checkFamInstConsistency #876

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@buggymcbugfix

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@buggymcbugfix

Since a recent upgrade I have been getting the following error in a source file:

expectJust checkFamInstConsistency
CallStack (from HasCallStack):
  error, called at compiler/utils/Maybes.hs:55:27 in ghc:Maybes
  expectJust, called at compiler/typecheck/FamInst.hs:461:30 in ghc:FamInst

I built ghcide with stack lts-13.18. Invoking stack build works fine.

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