I've been trying to install gi-gtk using "cabal install gi-gtk". In the process I upgraded to the most recent stable GHC and cabal. I've also installed gtk3 libraries which I thought were necessary.

...
[91 of 95] Compiling GI.Pango.Objects.Layout ( GI/Pango/Objects/Layout.hs, dist/build/GI/Pango/Objects/Layout.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 8.2.1 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 Layout
  which was lazily initialized by initIfaceCheck typecheckLoop,
  I tried to tie the knot, but I couldn't find Layout
  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:1133:58 in ghc:Outputable
        callStackDoc, called at compiler/utils/Outputable.hs:1137:37 in ghc:Outputable
        pprPanic, called at compiler/iface/TcIface.hs:1696:23 in ghc:TcIface

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

Failed to install gi-pango-1.0.15
cabal: Error: some packages failed to install:
gi-gdk-3.0.14-INozoUgbf2HFkX3VeIwKfl depends on gi-gdk-3.0.14 which failed to
install.
gi-gtk-3.0.17-1AObKz0Ppj5GXVupmEC7Yc depends on gi-gtk-3.0.17 which failed to
install.
gi-pango-1.0.15-E4HLwHGC2n62ObUIQeuwp8 failed during the building phase. The
exception was:
ExitFailure 1