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verlte() {
[ "$1" = "$(printf '%s\n%s\n' "$1" "$2" | sort -V | head -n1)" ]
}
mkdir -p "$build_dir/bin"
if command -v stack; then
stack_ver=$(stack --numeric-version)
else
stack_ver=0
fi
ghc_ver=$(ghc --numeric-version)
# we need at least 1.9.4 for `stack ide packages --cabal-files --stdout`
if verlte "$stack_ver" 1.9.3 &&
verlte 8.2.2 "$ghc_ver"
then
echo WARNING -- the tests need stack >= 1.9.4 please install it >&2
fi
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