Support for GHC 9 in basement

[LaurentRDC]

This PR fixes #536 and fixes #548.

I could not test with ghc-9.0.1 on my machine, but at least the tests pass for GHC 8.

[LaurentRDC]

I don't understand where is the problem involving Prelude.chr

[LaurentRDC]

Allright, thank you. I guess this PR is blocked until then, unless someone else can test locally with GHC 9

[harendra-kumar]

@LaurentRDC I have tested it with GHC 9.0, built gauge with it successfully. I think we can go ahead an commit it if someone has reviewed it.

[LaurentRDC]

Great, I removed the CI test for GHC 9. It's ready to go!

[LaurentRDC]

@haskell-foundation Can someone take a look at this? Thanks!

[danwdart]

This certainly seems to compile well for me.

[WillSewell]

Great to see GHC 9 support added to basement in this PR. However support still needs to be added to foundation: #551. That might not be clear from this PR title/description.

[patrickt]

Would love to see this merged, as the fact that basement doesn’t build means gauge and thereby fused-effects can’t move to GHC 9 yet.

[EmilGedda]

Great to see GHC 9 support added to basement in this PR. However support still needs to be added to foundation: #551. That might not be clear from this PR title/description.

There is already a fix for #551 (which would be the PR #540), which is just waiting for approval and merge.

[LaurentRDC]

This PR has been superseeded by commit 3c19590 so I'm closing it.