inko: 0.18.1 -> 0.19.1

rustPlatform.buildRustPackage (finalAttrs: {

  pname = "inko";

  version = "0.18.1";

  version = "0.19.1";

  src = fetchFromGitHub {

    owner = "inko-lang";

    repo = "inko";

    tag = "v${finalAttrs.version}";

    hash = "sha256-jVfAfR02R2RaTtzFSBoLuq/wdPaaI/eochrZaRVdmHY=";

    hash = "sha256-ZHVOwYvNRL2ObZt2PvayoqvS64MumN4oXQOgeCWbEUM=";

  };

  cargoHash = "sha256-IOMhwcZHB5jVYDM65zifxCjVHWl1EBbxNA3WVmarWcs=";

  cargoHash = "sha256-BHrbqPMQnhw8pjN8e0/qW1rPe/fMhs2iUbRVPt5ATrg=";

  buildInputs = [

    libffi

let

  source =

    # https://docs.inko-lang.org/manual/v0.19.1/getting-started/hello-concurrency/#channels

    writeText "hello.inko" # inko

      ''

        import std.process (sleep)

        import std.stdio (STDOUT)

        import std.stdio (Stdout)

        import std.sync (Channel)

        import std.time (Duration)

        class async Printer {

          fn async print(message: String, channel: Channel[Nil]) {

            let _ = STDOUT.new.print(message)

        type async Printer {

          fn async print(message: String, channel: uni Channel[Nil]) {

            let _ = Stdout.new.print(message)

            channel.send(nil)

          }

        }

        class async Main {

        type async Main {

          fn async main {

            let channel = Channel.new(size: 2)

            let channel = Channel.new

            Printer().print('Hello', channel)

            Printer().print('world', channel)

            Printer().print('Hello', recover channel.clone)

            Printer().print('world', recover channel.clone)

            sleep(Duration.from_millis(500))

            channel.receive

            channel.receive