build-support/ghc90-bin/ghc.install


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pre_upgrade() {
  echo '==> Unregistering cabalized packages...'
  [[ -d /usr/share/haskell-ghc-9.0 ]] && find /usr/share/haskell-ghc-9.0 -maxdepth 2 -name 'unregister.sh' -exec {} \;
  echo '==> Done.'
}

post_upgrade() {
  echo '==> All cabalized packages need to be reinstalled now.'
  echo '==> See /usr/share/haskell-ghc-9.0/ and ghc-pkg-9.0 list --user for a tentative list of affected packages.'
}