auto_enums_derive 0.3.2

This library provides an attribute macro like a wrapper of `#[derive]`, implementing the supported traits and passing unsupported traits to `#[derive]`.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

use proc_macro2::TokenStream;
use quote::quote;

use crate::utils::*;

pub(crate) const NAME: &[&str] = &["TrustedLen"];

pub(crate) fn derive(data: &Data) -> Result<TokenStream> {
    let root = std_root();
    let iter = quote!(#root::iter);

    derive_trait!(
        data,
        Some(ident_call_site("Item")),
        parse_quote!(#iter::TrustedLen)?,
        parse_quote! {
            unsafe trait TrustedLen: #iter::Iterator {}
        }?,
    )
}