let
  # Recursive factorial
  factorial = n:
    if n <= 1
    then 1
    else n * factorial (n - 1);

  # Fibonacci sequence generator
  fib = n:
    if n <= 1
    then n
    else fib (n - 1) + fib (n - 2);

  # List concatenation test
  range = start: end:
    if start >= end
    then []
    else [start] ++ range (start + 1) end;

  # Curried function application
  add = x: y: x + y;
  add5 = add 5;

  # Complex computation
  compute = x: y: let
    a = x * 2;
    b = y + 10;
    c = a * b;
  in
    c / 2;

  # Data structures
  numbers = range 1 11;

  # Nested attribute operations
  base = {
    config = {
      enable = true;
      value = 42;
    };
    data = {
      items = [1 2 3];
    };
  };

  extended =
    base
    // {
      config =
        base.config
        // {
          extra = "test";
          multiplied = base.config.value * 2;
        };
      computed = base.config.value + 100;
    };

  # Recursive attrset with selections
  recursive = rec {
    x = 10;
    y = x * 2;
    z = y + x;
    result = z * 3;
    final = result + x;
  };
in {
  fact5 = factorial 5;
  fib7 = fib 7;
  sum15 = add5 10;
  computed = compute 10 20;
  inherit numbers extended;
  deepValue = extended.config.multiplied;
  recursiveResult = recursive.result;
  recursiveFinal = recursive.final;
}