PKGBUILDs/community/ghc/ghc.install

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pre_upgrade() {
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if [[ ${1%-*} != ${2%-*} ]]; then
[[ -d /usr/share/haskell ]] && find /usr/share/haskell -maxdepth 2 -name 'unregister.sh' -exec {} \;
fi
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}
post_upgrade() {
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if [[ ${1%-*} != ${2%-*} ]]; then
echo '==> All cabalized packages need to be reinstalled now.'
echo '==> See /usr/share/haskell/ for a tentative list of affected packages.'
fi
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}