Codegen generating void?

[thunderstorm010]

Describe the bug

Rust type:
pub async fn set_motor(&self, idx: u8, pct: f32, rev: bool) -> Option<()>
Dart type:
Future<void?> setMotor({required int idx , required double pct , required bool rev });

Solution: Convert rust Option<()> to dart bool, where true represents Ok(()) and false represents None.

Steps to reproduce

Create functions like in the description.

Logs

line 136, column 16 of lib/src/rust/frb_generated.io.dart: Operator declarations must be preceded by the keyword 'operator'.
    ╷
136 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw);
    │                ^
    ╵
line 136, column 16 of lib/src/rust/frb_generated.io.dart: The string '?' isn't a user-definable operator.
    ╷
136 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw);
    │                ^
    ╵
line 136, column 16 of lib/src/rust/frb_generated.io.dart: Methods must have an explicit list of parameters.
    ╷
136 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw);
    │                ^
    ╵
line 136, column 18 of lib/src/rust/frb_generated.io.dart: A function body must be provided.
    ╷
136 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw);
    │                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ╵
line 246, column 16 of lib/src/rust/frb_generated.io.dart: Operator declarations must be preceded by the keyword 'operator'.
    ╷
246 │ @protected void? sse_decode_opt_box_autoadd_unit(SseDeserializer deserializer);
    │                ^
    ╵
line 246, column 16 of lib/src/rust/frb_generated.io.dart: The string '?' isn't a user-definable operator.
    ╷
246 │ @protected void? sse_decode_opt_box_autoadd_unit(SseDeserializer deserializer);
    │                ^
    ╵
line 246, column 16 of lib/src/rust/frb_generated.io.dart: Methods must have an explicit list of parameters.
    ╷
246 │ @protected void? sse_decode_opt_box_autoadd_unit(SseDeserializer deserializer);
    │                ^
    ╵
line 246, column 18 of lib/src/rust/frb_generated.io.dart: A function body must be provided.
    ╷
246 │ @protected void? sse_decode_opt_box_autoadd_unit(SseDeserializer deserializer);
    │                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ╵
line 358, column 53 of lib/src/rust/frb_generated.io.dart: Expected an identifier.
    ╷
358 │ @protected void sse_encode_opt_box_autoadd_unit(void? self, SseSerializer serializer);
    │                                                     ^
    ╵
line 358, column 55 of lib/src/rust/frb_generated.io.dart: Expected to find ')'.
    ╷
358 │ @protected void sse_encode_opt_box_autoadd_unit(void? self, SseSerializer serializer);
    │                                                       ^^^^
    ╵
Could not format because the source could not be parsed:

line 20, column 29 of lib/src/rust/api/vehicle/motor_testing.dart: Expected to find '>'.
   ╷
20 │                      Future<void?>  close();
   │                             ^^^^
   ╵
line 23, column 9 of lib/src/rust/api/vehicle/motor_testing.dart: Expected to find '>'.
   ╷
23 │  Future<void?>  setMotor({required int idx , required double pct , required bool rev });
   │         ^^^^
   ╵
Could not format because the source could not be parsed:

line 112, column 8 of lib/src/rust/frb_generated.dart: Expected to find '>'.
    ╷
112 │ Future<void?> crateApiVehicleMotorTestingMotorTestManagerClose({required MotorTestManager that });
    │        ^^^^
    ╵
line 114, column 8 of lib/src/rust/frb_generated.dart: Expected to find '>'.
    ╷
114 │ Future<void?> crateApiVehicleMotorTestingMotorTestManagerSetMotor({required MotorTestManager that , required int idx , required double pct , required bool rev });
    │        ^^^^
    ╵
line 544, column 18 of lib/src/rust/frb_generated.dart: Expected to find '>'.
    ╷
544 │ @override Future<void?> crateApiVehicleMotorTestingMotorTestManagerClose({required MotorTestManager that })  { return handler.executeNormal(NormalTask(
    │                  ^^^^
    ╵
line 569, column 18 of lib/src/rust/frb_generated.dart: Expected to find '>'.
    ╷
569 │ @override Future<void?> crateApiVehicleMotorTestingMotorTestManagerSetMotor({required MotorTestManager that , required int idx , required double pct , required bool rev })  { return handler.executeNormal(NormalTask(
    │                  ^^^^
    ╵
line 1310, column 15 of lib/src/rust/frb_generated.dart: Expected a type name.
     ╷
1310 │ return raw as void; }
     │               ^^^^
     ╵
line 1361, column 16 of lib/src/rust/frb_generated.dart: Operator declarations must be preceded by the keyword 'operator'.
     ╷
1361 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw){ // Codec=Dco (DartCObject based), see doc to use other codecs
     │                ^
     ╵
line 1361, column 16 of lib/src/rust/frb_generated.dart: The string '?' isn't a user-definable operator.
     ╷
1361 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw){ // Codec=Dco (DartCObject based), see doc to use other codecs
     │                ^
     ╵
line 1361, column 16 of lib/src/rust/frb_generated.dart: Methods must have an explicit list of parameters.
     ╷
1361 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw){ // Codec=Dco (DartCObject based), see doc to use other codecs
     │                ^
     ╵
line 1361, column 18 of lib/src/rust/frb_generated.dart: A function body must be provided.
     ╷
1361 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw){ // Codec=Dco (DartCObject based), see doc to use other codecs
     │                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     ╵
line 1586, column 16 of lib/src/rust/frb_generated.dart: Operator declarations must be preceded by the keyword 'operator'.
     ╷
1586 │ @protected void? sse_decode_opt_box_autoadd_unit(SseDeserializer deserializer){ // Codec=Sse (Serialization based), see doc to use other codecs
     │                ^
     ╵
(7 more errors...)
Could not format because the source could not be parsed:

line 139, column 16 of lib/src/rust/frb_generated.web.dart: Operator declarations must be preceded by the keyword 'operator'.
    ╷
139 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw);
    │                ^
    ╵
line 139, column 16 of lib/src/rust/frb_generated.web.dart: The string '?' isn't a user-definable operator.
    ╷
139 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw);
    │                ^
    ╵
line 139, column 16 of lib/src/rust/frb_generated.web.dart: Methods must have an explicit list of parameters.
    ╷
139 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw);
    │                ^
    ╵
line 139, column 18 of lib/src/rust/frb_generated.web.dart: A function body must be provided.
    ╷
139 │ @protected void? dco_decode_opt_box_autoadd_unit(dynamic raw);
    │                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ╵
line 249, column 16 of lib/src/rust/frb_generated.web.dart: Operator declarations must be preceded by the keyword 'operator'.
    ╷
249 │ @protected void? sse_decode_opt_box_autoadd_unit(SseDeserializer deserializer);
    │                ^
    ╵
line 249, column 16 of lib/src/rust/frb_generated.web.dart: The string '?' isn't a user-definable operator.
    ╷
249 │ @protected void? sse_decode_opt_box_autoadd_unit(SseDeserializer deserializer);
    │                ^
    ╵
line 249, column 16 of lib/src/rust/frb_generated.web.dart: Methods must have an explicit list of parameters.
    ╷
249 │ @protected void? sse_decode_opt_box_autoadd_unit(SseDeserializer deserializer);
    │                ^
    ╵
line 249, column 18 of lib/src/rust/frb_generated.web.dart: A function body must be provided.
    ╷
249 │ @protected void? sse_decode_opt_box_autoadd_unit(SseDeserializer deserializer);
    │                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ╵
line 361, column 53 of lib/src/rust/frb_generated.web.dart: Expected an identifier.
    ╷
361 │ @protected void sse_encode_opt_box_autoadd_unit(void? self, SseSerializer serializer);
    │                                                     ^
    ╵
line 361, column 55 of lib/src/rust/frb_generated.web.dart: Expected to find ')'.
    ╷
361 │ @protected void sse_encode_opt_box_autoadd_unit(void? self, SseSerializer serializer);
    │                                                       ^^^^
    ╵
)

Expected behavior

Option<()> -> bool

Generated binding code

No response

OS

No response

Version of flutter_rust_bridge_codegen

No response

Flutter info

No response

Version of clang++

No response

Additional context

No response

[fzyzcjy]

Hmm, is it possible to make the return type bool (instead of Option<()>)?