core/lib/tests/modules/functionTo/merging-attrs.nix

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{ lib, config, ... }:
let
inherit (lib) types;
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in
{
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options = {
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fun = lib.mkOption { type = types.functionTo (types.attrsOf types.str); };
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result = lib.mkOption {
type = types.str;
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default = toString (
lib.attrValues (
config.fun {
a = "a";
b = "b";
c = "c";
}
)
);
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};
};
config.fun = lib.mkMerge [
(input: { inherit (input) a; })
(input: { inherit (input) b; })
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(input: { b = lib.mkForce input.c; })
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];
}