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let
cmp = a: b:
let
ord1 = builtins.compareVersions a b;
ord2 = builtins.compareVersions b a;
in
assert ord1 == -ord2; ord1;
in
[
(cmp "1.2.3" "1.2.3")
(cmp "1.2.2" "1.2.3")
(cmp "1.2.3" "1.2.40")
(cmp "1.2.3" ".1.2.3")
(cmp "1.2.3" "1..2.3")
(cmp "1.2.3" "1.2.3.")
(cmp "1.2.3" "1.2")
(cmp "1.2.3" "1.2.a")
(cmp "1a.b" "1a.2")
(cmp "1" "")
(cmp "1.0" "1.0.0")
(cmp "2.3" "2.3pre")
(cmp "2.3" "2.3.0pre")
(cmp "2.3pre" "2.3.0pre")
(cmp "2.3" "2.3prepre")
(cmp "2.3pre" "2.3prepre")
(cmp "2.3prepre" "2.3prepre")
# Subset of test cases from eval-okay-versions.nix shipped by C++ Nix
(cmp "1.0" "2.3")
(cmp "2.1" "2.3")
(cmp "2.3" "2.3")
(cmp "2.5" "2.3")
(cmp "3.1" "2.3")
(cmp "2.3.1" "2.3")
(cmp "2.3.1" "2.3a")
(cmp "2.3pre1" "2.3")
(cmp "2.3pre3" "2.3pre12")
(cmp "2.3a" "2.3c")
(cmp "2.3pre1" "2.3c")
(cmp "2.3pre1" "2.3q")
]
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