nixpkgs/pkgs/lib/trivial.nix

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rec {
# Identity function.
id = x: x;
# Constant function.
const = x: y: x;
# Named versions corresponding to some builtin operators.
concat = x: y: x ++ y;
or = x: y: x || y;
and = x: y: x && y;
mergeAttrs = x: y: x // y;
# Take a function and evaluate it with its own returned value.
fix = f: let result = f result; in result;
}