Macro agnes::field_map_fn

macro_rules! field_map_fn {
    ($map_fn_ty:ty, Output = $output:ty; $($rest:tt)*) => { ... };
    ($(#[$meta_attr:meta])* $map_fn_ty:ident {
        type Output = $output:ty;
        $($attr:ident: $attr_ty:ty),*
    } $($rest:tt)*) => { ... };
    ($(#[$meta_attr:meta])* $map_fn_ty:ident<($($generics:tt)*)> {
        type Output = $output:ty;
        $($attr:ident: $attr_ty:ty),*
    } $($rest:tt)*) => { ... };
    ($(#[$meta_attr:meta])* $map_fn_ty:ident<($($generics:tt)*)> where ($($bounds:tt)*) {
        type Output = $output:ty;
        $($attr:ident: $attr_ty:ty),*
    } $($rest:tt)*) => { ... };
    ($(#[$meta_attr:meta])* pub $map_fn_ty:ident {
        type Output = $output:ty;
        $($attr:ident: $attr_ty:ty),*
    } $($rest:tt)*) => { ... };
    ($(#[$meta_attr:meta])* pub $map_fn_ty:ident<($($generics:tt)*)> {
        type Output = $output:ty;
        $($attr:ident: $attr_ty:ty),*
    } $($rest:tt)*) => { ... };
    ($(#[$meta_attr:meta])* pub $map_fn_ty:ident<($($generics:tt)*)> where ($($bounds:tt)*) {
        type Output = $output:ty;
        $($attr:ident: $attr_ty:ty),*
    } $($rest:tt)*) => { ... };
}