Pass plain lists and indexed items, letting RustQ borrow them

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## Unreleased
+
+### Changed
+
+- Generated helpers pass plain lists and indexed items and let RustQ borrow
+  them. This needs RustQ 1.0.0-rc.21.
+
 ## v0.7.0 - 2026-10-26
 
 ### Removed

README.md

@@ -110,7 +110,7 @@ in Rust what is too large or too hot for Elixir. It needs
 add it where you generate:
 
 ```elixir
-{:rustq, "~> 1.0.0-rc.19", only: [:dev, :test], runtime: false}
+{:rustq, "~> 1.0.0-rc.21", only: [:dev, :test], runtime: false}
 ```
 
 Then generate from `rustq.exs`, and let `mix rustq.gen` write the file and

codegen/kiwi_codec/rustler_generator/full/helpers.ex

@@ -55,26 +55,22 @@ if Code.ensure_loaded?(RustQ) do
           cached_struct_keys(
             env,
             ref(keys_static),
-            ref(
-              array([
-                repeat keys do
-                  key
-                end
-              ])
-            )
+            [
+              repeat keys do
+                key
+              end
+            ]
           )
 
         make_struct_from_arrays(
           env,
           keys,
-          ref(
-            array([
-              module_atom.to_term(env),
-              repeat fields do
-                field_expr.encode(env)
-              end
-            ])
-          )
+          [
+            module_atom.to_term(env),
+            repeat fields do
+              field_expr.encode(env)
+            end
+          ]
         )
       end
     end
@@ -109,13 +105,11 @@ if Code.ensure_loaded?(RustQ) do
           cached_struct_keys(
             env,
             ref(keys_static),
-            ref(
-              array([
-                repeat keys do
-                  key
-                end
-              ])
-            )
+            [
+              repeat keys do
+                key
+              end
+            ]
           )
 
         values = default_struct_values(env, module_atom, keys.len() - 1)
@@ -161,11 +155,11 @@ if Code.ensure_loaded?(RustQ) do
       field_id = decoder.read_var_uint()
 
       if field_id == 0 do
-        make_struct_from_arrays(env, keys, ref(values))
+        make_struct_from_arrays(env, keys, values)
       else
         case fields.binary_search_by_key(field_id, fn field -> field.id end) do
           {:ok, index} ->
-            field = fields.get(index).unwrap()
+            field = index(fields, index)
 
             assign!(
               index(values, field.index),

codegen/kiwi_codec/rustler_generator/skip/helpers.ex

@@ -106,7 +106,7 @@ if Code.ensure_loaded?(RustQ) do
         :ok
       else
         case fields.binary_search_by_key(field_id, fn field -> field.id end) do
-          {:ok, index} -> kiwi_skip_kind(decoder, ref(index(fields, index).kind))
+          {:ok, index} -> kiwi_skip_kind(decoder, index(fields, index).kind)
           {:error, _index} -> kiwi_unknown_field(decoder, definition_name, field_id)
         end
 

codegen/kiwi_codec/rustler_generator/sparse/helpers.ex

@@ -119,7 +119,7 @@ if Code.ensure_loaded?(RustQ) do
       else
         case fields.binary_search_by_key(field_id, fn field -> field.id end) do
           {:ok, index} ->
-            field = ref(index(fields, index))
+            field = index(fields, index)
             keys.push(kiwi_atom(env, field.name).encode(env))
             values.push(kiwi_field_value(env, decoder, field.repeated, field.decode))
 

guides/native-decoders.md

@@ -12,7 +12,7 @@ The generator needs RustQ, an optional dependency of KiwiCodec. Add it where you
 generate, usually only in development and test:
 
 ```elixir
-{:rustq, "~> 1.0.0-rc.19", only: [:dev, :test], runtime: false}
+{:rustq, "~> 1.0.0-rc.21", only: [:dev, :test], runtime: false}
 ```
 
 Generate from `rustq.exs`. `mix rustq.gen` writes the file, and

integration/generator_consumer/mix.exs

@@ -10,7 +10,7 @@ defmodule KiwiCodecGeneratorConsumer.MixProject do
   defp deps do
     [
       {:kiwi_codec, path: System.fetch_env!("KIWI_CODEC_PACKAGE_PATH")},
-      {:rustq, "~> 1.0.0-rc.19", only: [:dev, :test], runtime: false}
+      {:rustq, "~> 1.0.0-rc.21", only: [:dev, :test], runtime: false}
     ]
   end
 end

mix.exs

@@ -64,7 +64,7 @@ defmodule KiwiCodec.MixProject do
   # RUSTQ_PATH points at a local RustQ checkout, to try changes to it here.
   defp rustq_dep do
     case System.get_env("RUSTQ_PATH") do
-      nil -> {:rustq, "~> 1.0.0-rc.19", optional: true, runtime: false}
+      nil -> {:rustq, "~> 1.0.0-rc.21", optional: true, runtime: false}
       path -> {:rustq, path: path, optional: true, runtime: false, override: true}
     end
   end

mix.lock

@@ -20,8 +20,8 @@
   "nimble_parsec": {:hex, :nimble_parsec, "1.4.2", "8efba0122db06df95bfaa78f791344a89352ba04baedd3849593bfce4d0dc1c6", [:mix], [], "hexpm", "4b21398942dda052b403bbe1da991ccd03a053668d147d53fb8c4e0efe09c973"},
   "reach": {:hex, :reach, "2.8.4", "1158c2a43c7dc1a3a3531b751e97af7b4d770300b0cb2dd45500a48e63de5675", [:mix], [{:boxart, "~> 0.3.3", [hex: :boxart, repo: "hexpm", optional: true]}, {:ex_ast, "~> 0.12.0", [hex: :ex_ast, repo: "hexpm", optional: false]}, {:ex_dna, "~> 1.5", [hex: :ex_dna, repo: "hexpm", optional: true]}, {:libgraph, "~> 0.16.0", [hex: :libgraph, repo: "hexpm", optional: false]}, {:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: true]}, {:makeup_js, "~> 0.1", [hex: :makeup_js, repo: "hexpm", optional: true]}, {:quickbeam, "~> 0.10", [hex: :quickbeam, repo: "hexpm", optional: true]}], "hexpm", "06c01236ca0bec2c6a88cc1fbe240484958f76dc380418c7fea19eaffe804e44"},
   "rustler": {:hex, :rustler, "0.38.0", "7a8906998ff0d28e3021c0a73264abcda719bda344b2e58307c6805b0f87c9b4", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "704c03c1bf66be12b031c5a389347b91c81c5cb819a24b068b0de36fe4a5652a"},
-  "rustq": {:hex, :rustq, "1.0.0-rc.19", "189a1d64df08cf501bc0a056b6b330b9a228ab056ff004bf29c5e123bed9d840", [:mix], [{:json_codec, "~> 0.1", [hex: :json_codec, repo: "hexpm", optional: false]}, {:nimble_options, "~> 1.1", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:reach, "~> 2.0", [hex: :reach, repo: "hexpm", optional: false]}, {:rustler, "~> 0.37", [hex: :rustler, repo: "hexpm", optional: false]}, {:toml_elixir, "~> 3.1", [hex: :toml_elixir, repo: "hexpm", optional: false]}], "hexpm", "8bafa85947a00a9b5c7a41fbca3db6c975f21184bc67f8867a32922134386ded"},
+  "rustq": {:hex, :rustq, "1.0.0-rc.21", "ebffffc0234b60f80229c705df42d573adf329eeb89e4e86812f2e384552563b", [:mix], [{:json_codec, "~> 0.1", [hex: :json_codec, repo: "hexpm", optional: false]}, {:nimble_options, "~> 1.1", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:reach, "~> 2.0", [hex: :reach, repo: "hexpm", optional: false]}, {:rustler, "~> 0.37", [hex: :rustler, repo: "hexpm", optional: false]}, {:toml_elixir, "~> 3.1", [hex: :toml_elixir, repo: "hexpm", optional: false]}], "hexpm", "89bcaee02cc21ee361904ac7ca4525365360839ca4ac27587acd45c305d0d9b1"},
   "sourceror": {:hex, :sourceror, "1.13.0", "96bec2d8e5b183979fb70bd4d461b69db47fdc90871da599fababe76f7dae493", [:mix], [], "hexpm", "d72dd66dd2b82cc8e818b54ba0ab2ef0314c83ffcf231b1ad2ade00fa2ee3375"},
-  "toml_elixir": {:hex, :toml_elixir, "3.2.1", "3468b04dc54c0c33ffc05ec6996d5cb720a2e05192078fd0d9ec02b364ede9d8", [:mix], [], "hexpm", "64a723f91bb618dc53d11aff2167b4e55fbfdc3d8ff3b5030ecf52f345441629"},
+  "toml_elixir": {:hex, :toml_elixir, "3.3.0", "146cb7acca1e3a4f708da89a6f873035c1621d95a63e0ae532030e2bf8005c29", [:mix], [], "hexpm", "121a9e9f95e3c29b067abae64d303ec0649ad0998c71232b5651bd5600d4e093"},
   "varint": {:hex, :varint, "1.6.0", "7bced828599b2eb84491a9f067f8a5a67fc35a946d3b7582278083c7fd434b00", [:mix], [], "hexpm", "2b4f4a20650aeebe993a70b03bb99571bcbddc27c361322c28b586d8a772ce4e"},
 }

test/kiwi_codec/rustler_generator_test.exs

@@ -105,7 +105,6 @@ defmodule KiwiCodec.RustlerGenerator.NativeTest do
   @moduletag timeout: 600_000
 
   @prefix "KiwiCodec.NativeTest.Schema"
-  @runtime KiwiCodec.RustlerGenerator.Decoder.source()
 
   @schema """
   enum Kind {