Incompatibility with newer versions of base-compat and monadLib

[erdeszt]

The base-compat and monadLib dependencies don't have an upper bound and ivory fails to compile with newer versions. An example build here: https://travis-ci.org/github/erdeszt/ivory-avr-atmega328p-registers/jobs/744250954
I've found this combination of bounds to work: base-compat >= 0.10.5 && < 0.11 and monadLib >= 3.7.3 && < 3.8
I'm unsure if it should be fixed by constraining the versions or fixing the code to work with newer versions but I'd be happy to give a shot at a PR in either case.

[sorki]

This is already fixed in master but this stack is not getting much attention nowadays - I do maintain https://github.com/HaskellEmbedded/ivory-tower-nix/ which is slowly turning into a fork, although most of the core repositories have just couple of patches on top of (see e.g. https://github.com/distrap/ivory/). From time to time I update everything to to most recent GHC and bump the ivory-tower-nix repo when everything builds, currently slowly porting to GHC9.

You could also just override packages in your cabal.project or stack.yaml to point to git master instead of Hackage released versions.