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with builtins;
let
fold = op: nul: list:
if list == [ ]
then nul
else op (head list) (fold op nul (tail list));
concat =
fold (x: y: x + y) "";
asi = name: value: { inherit name value; };
list = [ (asi "a" "A") (asi "b" "B") ];
a = builtins.listToAttrs list;
b = builtins.listToAttrs (list ++ list);
r = builtins.listToAttrs [ (asi "result" [ a b ]) (asi "throw" (throw "this should not be thrown")) ];
x = builtins.listToAttrs [ (asi "foo" "bar") (asi "foo" "bla") ];
in
concat (map (x: x.a) r.result) + x.foo
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