Macro doesn't actually derive any trait

[Ddystopia]

Hello, this code:

#[derive(Functor)]
struct Identity<T>(std::marker::PhantomData<T>);

Expands into this:

struct Identity<T>(std::marker::PhantomData<T>);
#[allow(absolute_paths_not_starting_with_crate)]
#[allow(bare_trait_objects)]
#[allow(deprecated)]
#[allow(drop_bounds)]
#[allow(dyn_drop)]
#[allow(non_camel_case_types)]
#[allow(trivial_bounds)]
#[allow(unused_qualifications)]
#[allow(clippy::allow)]
#[automatically_derived]
impl<T> Identity<T> {
    pub fn fmap<__B>(self, __f: impl Fn(T) -> __B) -> Identity<__B>
    where
        T: Sized,
    {
        use ::functor_derive::*;
        self.__fmap_0_ref(&__f)
    }
    pub fn try_fmap<__B, __E>(
        self,
        __f: impl Fn(T) -> Result<__B, __E>,
    ) -> Result<Identity<__B>, __E>
    where
        T: Sized,
    {
        use ::functor_derive::*;
        self.__try_fmap_0_ref(&__f)
    }
}
#[allow(absolute_paths_not_starting_with_crate)]
#[allow(bare_trait_objects)]
#[allow(deprecated)]
#[allow(drop_bounds)]
#[allow(dyn_drop)]
#[allow(non_camel_case_types)]
#[allow(trivial_bounds)]
#[allow(unused_qualifications)]
#[allow(clippy::allow)]
#[automatically_derived]
impl<T> Identity<T> {
    pub fn __fmap_0_ref<__B>(self, __f: &impl Fn(T) -> __B) -> Identity<__B>
    where
        T: Sized,
    {
        use ::functor_derive::*;
        Identity(self.0.__fmap_0_ref(__f))
    }
    pub fn __try_fmap_0_ref<__B, __E>(
        self,
        __f: &impl Fn(T) -> Result<__B, __E>,
    ) -> Result<Identity<__B>, __E>
    where
        T: Sized,
    {
        use ::functor_derive::*;
        Ok(Identity(self.0.__try_fmap_0_ref(__f)?))
    }
}

But there is no implementation of ::functor_derive::Functor trait. So it can't be used generically. You can only call those methods, but you can't accept a generic functor.

[JonathanBrouwer]

Yeah you're right, it seems like this broke at some point.
I currently don't have the energy to fix this, though I'm happy to review & accept a contribution to fix this :)