hadrian doesn't build with ghc 9.4.1 yet

cabal fails to calculate a build plan:

$ hadrian/build --version
Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: hadrian-0.1.0.0 (user goal)
[__1] trying: hadrian:+selftest
[__2] trying: QuickCheck-2.14.2 (dependency of hadrian +selftest)
[__3] trying: splitmix-0.1.0.4 (dependency of QuickCheck)
[__4] next goal: base (dependency of hadrian)
[__4] rejecting: base-4.17.0.0/installed-4.17.0.0 (conflict: splitmix =>
base>=4.3 && <4.17)
[__4] rejecting: base-4.16.1.0, base-4.16.0.0, base-4.15.1.0, base-4.15.0.0,
base-4.14.3.0, base-4.14.2.0, base-4.14.1.0, base-4.14.0.0, base-4.13.0.0,
base-4.12.0.0, base-4.11.1.0, base-4.11.0.0, base-4.10.1.0, base-4.10.0.0,
base-4.9.1.0, base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
[__4] fail (backjumping, conflict set: base, hadrian, splitmix)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, QuickCheck, splitmix, hadrian,
hadrian:selftest

There are other bound issues with bytestring, text and hashable if you keep trying.