Structs provide a simple data model, especially with private members for encapsulation.

Augmenting structs is encouraged, as in:

module Plop

struct Point = { _id, x, y }

augment Plop.types.Point {

  function str = |this| -> "{id=" + this: _id() + ",x=" + this: x() + ",y=" + this: y() + "}"
}

When an augmentation on a struct is defined within the same module, then you can omit the full type name of the struct:

module Plop

struct Point = { _id, x, y }

augment Point {

  function str = |this| -> "{id=" + this: _id() + ",x=" + this: x() + ",y=" + this: y() + "}"
}

Again, it is important to note that augmentations can only access private struct members when they originate from the same module.

module Foo

struct Value = { v }

augment Foo.types.Value {

  function a = |this| -> "a"
}

# This will discard the previous augmentation...
augment Value {

  function b = |this| -> "a"
}

function check = {
  let v = Value(666)

  # Ok
  v: b()

  # Fails, the concise augmentation overrides the fully-qualifed one
  v: a()
}