bug: cannot export individual pallet calls

[liamaharon]

This does not work:

	#[pallet::call]
	impl<T: Config> Pallet<T> {
		#[pallet::call_index(0)]
		#[docify::export(set_value)]
		pub fn set_value(origin: OriginFor<T>, value: u32) -> DispatchResult {
			ensure_signed(origin)?;

			let previous = Value::<T>::get().map(|v| v.current);
			let new_struct = CurrentAndPreviousValue { current: value, previous };
			<Value<T>>::put(new_struct);

			Ok(())
		}
	}

When I try to use #![doc = docify::embed!("src/lib.rs", set_value)] in my docs, I get a compile error:

error: Could not find docify export item 'set_value' in '...'.
  --> substrate/frame/examples/storage-migrations/src/lib.rs:56:39
   |
56 | #![doc = docify::embed!("src/lib.rs", set_value)]
   |                                       ^^^^^^^^^

However, I am able to export all calls:

        #[docify::export(pallet_calls)]
	#[pallet::call]
	impl<T: Config> Pallet<T> {
		#[pallet::call_index(0)]
		pub fn set_value(origin: OriginFor<T>, value: u32) -> DispatchResult {
			ensure_signed(origin)?;

			let previous = Value::<T>::get().map(|v| v.current);
			let new_struct = CurrentAndPreviousValue { current: value, previous };
			<Value<T>>::put(new_struct);

			Ok(())
		}
	}

#![doc = docify::embed!("src/lib.rs", pallet_calls)] works

[sam0x17]

It's all impl fns it looks like, this reproduces it:

trait SomeTrait {
    fn trait_impl_method();
}

pub struct Liam9;

impl SomeTrait for Liam9 {
    #[docify::export]
    fn trait_impl_method() {
        println!("foo!");
    }
}

error: Could not find docify export item 'trait_impl_method' in '/home/sam/workspace/docify/examples/samples.rs'.
  --> examples/integration.rs:66:47
   |
66 | #[doc = docify::embed!("examples/samples.rs", trait_impl_method)]

[sam0x17]

Yes indeed, the visitor pattern right now only visits syn::Items, not syn::ImplItems, so will add that. Will do TraitItem as well