errore_impl/
lib.rs

1#![allow(
2    clippy::blocks_in_conditions,
3    clippy::cast_lossless,
4    clippy::cast_possible_truncation,
5    clippy::manual_find,
6    clippy::manual_let_else,
7    clippy::manual_map,
8    clippy::map_unwrap_or,
9    clippy::module_name_repetitions,
10    clippy::needless_pass_by_value,
11    clippy::range_plus_one,
12    clippy::single_match_else,
13    clippy::struct_field_names,
14    clippy::too_many_lines,
15    clippy::wrong_self_convention
16)]
17
18extern crate proc_macro;
19
20mod ast;
21mod attr;
22mod expand;
23mod fmt;
24mod generics;
25mod prop;
26mod span;
27mod util;
28mod valid;
29
30use proc_macro::TokenStream;
31use syn::{parse_macro_input, DeriveInput};
32
33#[proc_macro_derive(Error, attributes(backtrace, error, from, source))]
34pub fn derive_error(input: TokenStream) -> TokenStream {
35    let input = parse_macro_input!(input as DeriveInput);
36    expand::error::derive(&input).into()
37}
38
39/// The `display` derive macro implements only a simple [`Display`](std::fmt::Display)
40/// trait with an empty [`Error`](std::error::Error) trait.
41#[proc_macro_derive(Display, attributes(display))]
42pub fn derive_display(input: TokenStream) -> TokenStream {
43    let input = parse_macro_input!(input as DeriveInput);
44    expand::display::derive(&input).into()
45}