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This PR makes Hedgehog compile with the current GHC development branch (soon to be GHC 9). It only required two minor changes on hedgehog side:
Data.Kind.Type
instead of*
See the commit messages for a bit more details.
These changes should be enough from the hedgehog side, but even after these:
--allow-newer
flag has to be passed sinceprimitive
has an overly restrictive upper bound onbase
.QuickCheck
does not compile yet, sohedgehog-quickcheck
does not work yet.I tried to keep the changes as small as possible while maintaining the backwards compatibility, however I did only check with GHC 8.10 and GHC 9. Let me know if there is anything else I should do to get it compatible with even older GHC versions.