errors.txt

error[E0412]: cannot find type `F` in this scope
  --> derive/tests/derive_generics.rs:15:53
   |
15 |     fn get<F>(&mut self, _: &mut (), msg: GetTarget<F>) -> u32
   |                                                     ^ help: a trait with a similar name exists: `Fn`

error[E0412]: cannot find type `F` in this scope
  --> derive/tests/derive_generics.rs:15:53
   |
15 |     fn get<F>(&mut self, _: &mut (), msg: GetTarget<F>) -> u32
   |                                                     ^ help: a type parameter with a similar name exists: `A`

expand-input.rs

#[derive(Clone, Default, Debug, Deserialize, Serialize, TransferOwnership)]
pub struct RoomTargets;

#[process(process_type = ::ProcessType)]
impl RoomTargets {
    #[sync_msg]
    fn get<F>(&mut self, _: &mut (), msg: GetTarget<F>) -> u32
    where
        F: FnOnce(u32) -> u32 + Message,
    {
        (msg.get)(5)
    }
}

#[derive(Clone, Default, Debug, Deserialize, Serialize, TransferOwnership)]
pub struct GetTarget<F: FnOnce(u32) -> u32> {
    get: F,
}

expand-output.rs

impl<F> ::tungsten::SyncMessageReceiver<GetTarget<F>> for RoomTargets
where
    F: FnOnce(u32) -> u32 + Message,
{
    type Result = u32;
    fn recv(&mut self, _: &mut (), msg: GetTarget<F>) -> u32 {
        (msg.get)(5)
    }
}