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let

  f = args@{x, y, z}: x + args.y + z;

  g = {x, y, z}@args: f args;

  h = {x ? "d", y ? x, z ? args.x}@args: x + y + z;

  j = {x, y, z, ...}: x + y + z;

in
[
  (f {x = "a"; y = "b"; z = "c";})
  (g {x = "x"; y = "y"; z = "z";})
  (h {x = "D";})
  (h {x = "D"; y = "E"; z = "F";})
  (j {x = "i"; y = "j"; z = "k"; bla = "bla"; foo = "bar";})
]