Resolving dependencies...
Configuring multirec-0.7.7...
Building multirec-0.7.7...
Installed multirec-0.7.7
Configuring zipper-0.4...
Building zipper-0.4...
Failed to install zipper-0.4
Build log ( /home/builder/.cabal/logs/zipper-0.4.log ):
cabal: Entering directory '/tmp/cabal-tmp-26601/zipper-0.4'
Configuring zipper-0.4...
Building zipper-0.4...
Preprocessing library zipper-0.4...
[1 of 1] Compiling Generics.MultiRec.Zipper ( src/Generics/MultiRec/Zipper.hs, dist/build/Generics/MultiRec/Zipper.o )

src/Generics/MultiRec/Zipper.hs:70:1: error:
    • ‘Ctx’ has no constructors (EmptyDataDecls permits this)
    • In the data instance declaration for ‘Ctx’

src/Generics/MultiRec/Zipper.hs:71:1: error:
    • ‘Ctx’ has no constructors (EmptyDataDecls permits this)
    • In the data instance declaration for ‘Ctx’
cabal: Leaving directory '/tmp/cabal-tmp-26601/zipper-0.4'
cabal: Error: some packages failed to install:
zipper-0.4 failed during the building phase. The exception was:
ExitFailure 1