Panic while forcing the thunk for TyThing IsFile (regression)

(Apologies in advance for the very non-minimal testcase. I have been unsuccessfully trying to reduce the testcase for a few hours now, but I am flying blind, and the bug seems to depend on the interaction of various modules. The panic is very reproducible for me, so I figured that better reporting even if I failed to obtain a simplified testcase. Maybe someone else has more luck isolating the issue.)

When compiling gi-gio-2.0.12 I consistently get the following GHC panic:

[259 of 293] Compiling GI.Gio.Interfaces.File ( GI/Gio/Interfaces/File.hs, dist/build/GI/Gio/Interfaces/File.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 8.2.0.20170507 for x86_64-unknown-linux):
	tcIfaceGlobal (local): not found
  You are in a maze of twisty little passages, all alike.
  While forcing the thunk for TyThing IsFile
  which was lazily initialized by initIfaceCheck typecheckLoop,
  I tried to tie the knot, but I couldn't find IsFile
  in the current type environment.
  If you are developing GHC, please read Note [Tying the knot]
  and Note [Type-checking inside the knot].
  Consider rebuilding GHC with profiling for a better stack trace.
  Contents of current type environment: []
  Call stack:
      CallStack (from HasCallStack):
        prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1134:58 in ghc:Outputable
        callStackDoc, called at compiler/utils/Outputable.hs:1138:37 in ghc:Outputable
        pprPanic, called at compiler/iface/TcIface.hs:1689:23 in ghc:TcIface

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

To compile this code you will need the glib2-devel package installed. To compile

$ cabal get gi-gio-2.0.12
$ cd gi-gio-2.0.12
$ cabal sandbox init
$ cabal install --dependencies-only
$ cabal build

I am running version 8.2.0.20170507, from https://copr.fedorainfracloud.org/coprs/petersen/ghc-8.2.1/ .

The same code compiles in versions 7.8.x, 7.10.x and 8.0.x.

Trac metadata

Trac field	Value
Version	8.2.1-rc2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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