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

Calculating dependencies ... done!
Dependency resolution took 1.94 s (backtrack: 7/20).

[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/data-array-byte-0.1.0.2:0/0.1.0.2::gentoo  USE="-doc -hscolour -profile (-test)" 7 KiB
[ebuild  N     ] dev-haskell/prettyprinter-1.7.1:0/1.7.1::gentoo  USE="text -buildreadme -doc -hscolour -profile (-test)" 56 KiB
[ebuild  N     ] dev-haskell/colour-2.3.6:0/2.3.6::gentoo  USE="-doc -hscolour -profile (-test)" 21 KiB
[ebuild  N     ] dev-haskell/split-0.2.5:0/0.2.5::gentoo  USE="-doc -hscolour -profile -test" 16 KiB
[ebuild  N     ] dev-haskell/vector-stream-0.1.0.1:0/0.1.0.1::gentoo  USE="-doc -hscolour -profile" 14 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/transformers-compat-0.7.2:0/0.7.2::gentoo  USE="-doc -hscolour -profile" 46 KiB
[ebuild  N     ] dev-haskell/splitmix-0.1.3.2:0/0.1.3.2::gentoo  USE="-doc -hscolour -optimised-mixer -profile (-test)" 12 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/primitive-0.9.1.0:0/0.9.1.0::gentoo  USE="-doc -hscolour -profile (-test)" 64 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/random-1.2.1.3:0/1.2.1.3::gentoo  USE="-doc -hscolour -profile -test" 47 KiB
[ebuild  N     ] dev-haskell/ansi-terminal-types-1.1.3:0/1.1.3::gentoo  USE="-doc -hscolour -profile" 9 KiB
[ebuild  N     ] dev-haskell/ansi-terminal-1.1.5:0/1.1.5::gentoo  USE="-doc -examples -hscolour -profile" 33 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/prettyprinter-ansi-terminal-1.1.3:0/1.1.3::gentoo  USE="-doc -hscolour -profile (-test)" 9 KiB
[ebuild  N     ] dev-haskell/optparse-applicative-0.18.1.0-r1:0/0.18.1.0::gentoo  USE="-doc -hscolour -profile -test" 65 KiB
[ebuild  N     ] dev-haskell/tasty-1.5.3:0/1.5.3::gentoo  USE="-doc -hscolour -profile" 68 KiB
[ebuild  N     ] dev-haskell/vector-0.13.2.0:0/0.13.2.0::gentoo  USE="boundschecks -doc -hscolour -internalchecks -profile -test -unsafechecks" 190 KiB
[ebuild  N     ] dev-haskell/bitvec-1.1.5.0:0/1.1.5.0::gentoo  USE="simd -doc -hscolour -profile -test" 44 KiB
[ebuild  N     ] dev-haskell/vector-algorithms-0.9.1.0:0/0.9.1.0::gentoo  USE="bench boundschecks -doc -hscolour -internalchecks -profile -test -unsafechecks" 29 KiB
[ebuild  N     ] dev-haskell/mono-traversable-1.0.15.1:0/1.0.15.1::gentoo  USE="-doc -hscolour -profile -test" 40 KiB

Total: 29 packages (29 new), Size of downloads: 150495 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/mono-traversable-1.0.15.1:0/1.0.15.1::gentoo, ebuild scheduled for merge) USE="-doc -hscolour -profile -test"
    ^             ^^^


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

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