These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.83 s (backtrack: 6/20).

[ebuild  N     ] app-text/dos2unix-7.5.7::gentoo  USE="nls -debug -test -verify-sig" 977 KiB
[ebuild  N     ] dev-lang/ghc-9.0.2-r4:0/9.0.2::gentoo  USE="gmp (-big-endian) -binary -doc -elfutils -ghcbootstrap -ghcmakebinary (-llvm) -numa -profile -test -unregisterised" 147774 KiB
[ebuild  N     ] app-admin/haskell-updater-1.5.0.0::gentoo  45 KiB
[ebuild  N     ] dev-haskell/text-1.2.5.0-r1:0/1.2.5.0::gentoo  USE="-doc -hscolour -profile" 153 KiB
[ebuild  N     ] dev-haskell/parsec-3.1.14.0-r2:0/3.1.14.0::gentoo  USE="-doc -hscolour -profile" 40 KiB
[ebuild  N     ] dev-haskell/cabal-syntax-3.10.3.0:0/3.10.3.0::gentoo  USE="-doc -hscolour -profile" 228 KiB
[ebuild  N     ] dev-haskell/cabal-3.10.3.0:0/3.10.3.0::gentoo  USE="-doc -hscolour -profile" 389 KiB
[ebuild  N     ] dev-haskell/tagged-0.8.10:0/0.8.10::gentoo  USE="template-haskell -doc -hscolour -profile" 11 KiB
[ebuild  N     ] dev-haskell/base-orphans-0.9.3:0/0.9.3::gentoo  USE="-doc -hscolour -profile (-test)" 20 KiB
[ebuild  N     ] dev-haskell/fingertree-0.1.5.0:0/0.1.5.0::gentoo  USE="-doc -hscolour -profile -test" 21 KiB
[ebuild  N     ] dev-haskell/semigroups-0.20.1:0/0.20.1::gentoo  USE="-doc -hscolour -profile" 6 KiB
[ebuild  N     ] dev-haskell/transformers-compat-0.7.2:0/0.7.2::gentoo  USE="-doc -hscolour -profile" 46 KiB
[ebuild  N     ] dev-haskell/statevar-1.2.2-r1:0/1.2.2::gentoo  USE="-doc -hscolour -profile" 5 KiB
[ebuild  N     ] dev-haskell/th-abstraction-0.7.2.0:0/0.7.2.0::gentoo  USE="-doc -hscolour -profile -test" 45 KiB
[ebuild  N     ] dev-haskell/data-array-byte-0.1.0.2:0/0.1.0.2::gentoo  USE="-doc -hscolour -profile (-test)" 7 KiB
[ebuild  N     ] dev-haskell/hashable-1.4.2.0-r2:0/1.4.2.0::gentoo  USE="-doc -hscolour -profile -random-initial-seed -test" 29 KiB
[ebuild  N     ] dev-haskell/distributive-0.6.3:0/0.6.3::gentoo  USE="-doc -hscolour -profile -test" 8 KiB
[ebuild  N     ] dev-haskell/foldable1-classes-compat-0.1.3:0/0.1.3::gentoo  USE="tagged -doc -hscolour -profile (-test)" 14 KiB
[ebuild  N     ] dev-haskell/contravariant-1.5.5:0/1.5.5::gentoo  USE="semigroups statevar tagged -doc -hscolour -profile" 14 KiB
[ebuild  N     ] dev-haskell/assoc-1.1.1:0/1.1.1::gentoo  USE="tagged -doc -hscolour -profile" 5 KiB
[ebuild  N     ] dev-haskell/unordered-containers-0.2.21:0/0.2.21::gentoo  USE="-doc -hscolour -profile -test" 71 KiB
[ebuild  N     ] dev-haskell/indexed-traversable-0.1.4:0/0.1.4::gentoo  USE="-doc -hscolour -profile" 12 KiB
[ebuild  N     ] dev-haskell/comonad-5.0.10:0/5.0.10::gentoo  USE="indexed-traversable -doc -hscolour -profile" 15 KiB
[ebuild  N     ] dev-haskell/bifunctors-5.6.3:0/5.6.3::gentoo  USE="tagged -doc -hscolour -profile -test" 38 KiB
[ebuild  N     ] dev-haskell/semigroupoids-5.3.7-r1:0/5.3.7::gentoo  USE="-doc -hscolour -profile" 35 KiB
[ebuild  N     ] dev-haskell/reducers-3.12.3-r1:0/3.12.3::gentoo  USE="-doc -hscolour -profile" 14 KiB

Total: 26 packages (26 new), Size of downloads: 150008 KiB

WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict:

dev-lang/ghc:0

  (dev-lang/ghc-9.8.4-r1:0/9.8.4::gentoo, ebuild scheduled for merge) USE="gmp (-big-endian) -doc -elfutils -ghcbootstrap -ghcmakebinary -llvm -numa -profile -test -unregisterised -verify-sig" LLVM_SLOT="20 -17 -18 -19" conflicts with
    <dev-lang/ghc-9.1 required by (dev-haskell/reducers-3.12.3-r1:0/3.12.3::gentoo, ebuild scheduled for merge) USE="-doc -hscolour -profile"
    ^             ^^^


!!! The following update(s) have been skipped due to unsatisfied dependencies
!!! triggered by backtracking:

dev-haskell/parsec:0
dev-haskell/hashable:0