plutus_data_derive 0.0.1

you probably want to reference the plutus_data crate and not this one
Documentation 
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#![feature(proc_macro_diagnostic)]
use quote::*;
use proc_macro::{TokenStream};
use syn::{parse_macro_input, DeriveInput, Data, DataStruct, Fields,FieldsNamed,FieldsUnnamed};

#[macro_use] extern crate quote;
extern crate syn;

#[allow(dead_code)]
pub (crate) fn emit_msg(ident_span:&syn::Ident,x:&str,lvl:proc_macro::Level) {
    proc_macro::Diagnostic::spanned(
        syn::spanned::Spanned::span(ident_span).unwrap(), 
        lvl, 
        x                 
    ).emit();
}

#[allow(dead_code)]
pub (crate) fn info(ident_span:&syn::Ident,x:&str) {
    emit_msg(ident_span,x,proc_macro::Level::Note);
}

#[allow(dead_code)]
pub (crate) fn err(ident_span:&syn::Ident,x:&str) {
    emit_msg(ident_span,x,proc_macro::Level::Error);
}

#[allow(dead_code)]
pub (crate) fn warn(ident_span:&syn::Ident,x:&str) {
    emit_msg(ident_span,x,proc_macro::Level::Warning);
}

pub (crate) fn type_to_str(x:&syn::Type) -> String {
    match x.clone() {
        syn::Type::Path(type_path) => type_path.clone().into_token_stream().to_string().replace(" ", ""),
        syn::Type::Array(a) => {
            let eltype = type_to_str(&a.elem).replace(" ", "");
            format!("Vec<{}>",eltype)
        },
        _ => unimplemented!(),
    }
}

mod encoding;
mod decoding;

use encoding::*;
use decoding::*;


#[proc_macro_derive(ToPlutusDataDerive,attributes(base_16,force_variant))]
pub fn to_plutus_data_macro(input: TokenStream) -> TokenStream {

    let input = parse_macro_input!(input as DeriveInput);
    let name = input.ident;
    
    match input.data {

        syn::Data::Union(_) => {
            err(&name,&format!("Cannot use union types with the plutus_data crate macros."));
            let hmm = quote! {};
            return TokenStream::from(hmm);
        }

        Data::Struct(DataStruct { fields: Fields::Unit, .. }) => {
            err(&name,&format!("Cannot contain fields of type unit."));
            let hmm = quote! {};
            return TokenStream::from(hmm);
        },

        Data::Struct(DataStruct {fields: Fields::Unnamed(FieldsUnnamed { 
            unnamed: unnamed_fields,..
        }),..}) => handle_struct_encoding(unnamed_fields,name),
        
        Data::Struct(DataStruct {fields: Fields::Named(FieldsNamed { 
            named:named_fields, .. 
        }), .. }) => handle_struct_encoding(named_fields,name),

        syn::Data::Enum(ve) => 
            data_enum_encoding_handling(ve,name)
    }
}




#[proc_macro_derive(FromPlutusDataDerive)]
pub fn from_plutus_data_macro(input: TokenStream) -> TokenStream {

    let input = parse_macro_input!(input as DeriveInput);
    let name = input.ident;
    
    match input.data {

        syn::Data::Union(_) => {
            err(&name,&format!("Cannot use union types with the plutus_data crate macros."));
            return TokenStream::from(quote! {});
        }

        Data::Struct(DataStruct { fields: Fields::Unit, .. }) => {
            err(&name,&format!("Cannot contain fields of type unit."));
            return TokenStream::from(quote! {});
        },

        Data::Struct(DataStruct {fields: Fields::Unnamed(FieldsUnnamed { 
            unnamed: unnamed_fields,..
        }),..}) => handle_struct_decoding(unnamed_fields,name),
        
        Data::Struct(DataStruct {fields: Fields::Named(FieldsNamed { 
            named:named_fields, .. 
        }), .. }) => handle_struct_decoding(named_fields,name),

        syn::Data::Enum(vf) => 
            data_enum_decoding_handling(vf,name)
    }
}