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

Calculating dependencies ... done!
Dependency resolution took 1.70 s (backtrack: 0/20).

[ebuild  N     ] app-text/dos2unix-7.5.7::gentoo  USE="nls -debug -test -verify-sig" 977 KiB
[ebuild  N     ] dev-lang/ghc-9.8.4-r1:0/9.8.4::gentoo  USE="gmp (-big-endian) -doc -elfutils -ghcbootstrap -ghcmakebinary -llvm -numa -profile -test -unregisterised -verify-sig" LLVM_SLOT="20 -17 -18 -19" 238903 KiB
[ebuild  N     ] app-admin/haskell-updater-1.5.0.0::gentoo  45 KiB
[ebuild  N     ] dev-haskell/parsec-3.1.17.0:0/3.1.17.0::gentoo  USE="-doc -hscolour -profile" 38 KiB
[ebuild  N     ] dev-haskell/text-2.1.1:0/2.1.1::gentoo  USE="simdutf -doc -hscolour -profile" 294 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/primitive-0.7.4.0:0/0.7.4.0::gentoo  USE="-doc -hscolour -profile (-test)" 59 KiB
[ebuild  N     ] dev-haskell/zlib-0.6.3.0:0/0.6.3.0::gentoo  USE="-bundled-c-zlib -doc -hscolour -non-blocking-ffi -profile -test" 367 KiB
[ebuild  N     ] dev-haskell/vector-0.12.3.1-r1:0/0.12.3.1::gentoo  USE="boundschecks -doc -hscolour -internalchecks -profile -test -unsafechecks" 156 KiB
[ebuild  N     ] dev-haskell/juicypixels-3.3.7:0/3.3.7::gentoo  USE="-doc -hscolour -mmap -profile" 130 KiB

Total: 11 packages (11 new), Size of downloads: 241581 KiB

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

dev-haskell/primitive:0

  (dev-haskell/primitive-0.9.1.0:0/0.9.1.0::gentoo, ebuild scheduled for merge) USE="-doc -hscolour -profile (-test)" conflicts with
    <dev-haskell/primitive-0.9:= required by (dev-haskell/vector-0.12.3.1-r1:0/0.12.3.1::gentoo, ebuild scheduled for merge) USE="boundschecks -doc -hscolour -internalchecks -profile -test -unsafechecks"
    ^                      ^^^