struct_update.kc3

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Author : Thomas de Grivel
Date : 2026-08-08 23:12:38
Hash : d9b59ebb
Message : struct update

test/ikc3/struct_update.kc3

quote defmodule StructUpdateTest do
  defstruct [a: 1, b: 2, c: 3]
end
defmodule StructUpdateTest do
  defstruct [a: 1, b: 2, c: 3]
end

quote old = %StructUpdateTest{a: 4, b: 5, c: 6}
old = %StructUpdateTest{a: 4, b: 5, c: 6}
quote updated = %StructUpdateTest{old | a: 10, c: 20 + 10}
updated = %StructUpdateTest{old | a: 10, c: 20 + 10}
old
updated
old.a
old.b
old.c
updated.a
updated.b
updated.c

# Changes are applied in source order to the one copied struct.
%StructUpdateTest{old | a: 7, a: 8}

# Invalid source types and unknown fields fail cleanly.
%StructUpdateTest{%Time{} | a: 1}
%StructUpdateTest{old | unknown: 1}

kc3-lang/kc3/test/ikc3/struct_update.kc3

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