guix/tests/lang/eval-okay-closure.nix

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let
closure = builtins.genericClosure {
startSet = [{key = 80;}];
operator = {key, foo ? false}:
if builtins.lessThan key 0
then []
else [{key = builtins.sub key 9;} {key = builtins.sub key 13; foo = true;}];
};
sort = (import ./lib.nix).sortBy (a: b: builtins.lessThan a.key b.key);
in sort closure