therror_impl/
lib.rs

1#![allow(
2    clippy::blocks_in_if_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::needless_pass_by_value,
10    clippy::option_if_let_else,
11    clippy::range_plus_one,
12    clippy::single_match_else,
13    clippy::too_many_lines,
14    clippy::wrong_self_convention
15)]
16
17extern crate proc_macro;
18
19mod ast;
20mod attr;
21mod expand;
22mod fmt;
23mod generics;
24mod prop;
25mod valid;
26
27use proc_macro::TokenStream;
28use syn::{parse_macro_input, DeriveInput};
29
30#[proc_macro_derive(Error, attributes(backtrace, error, from, source))]
31pub fn derive_error(input: TokenStream) -> TokenStream {
32    let input = parse_macro_input!(input as DeriveInput);
33    expand::derive(&input)
34        .unwrap_or_else(|err| err.to_compile_error())
35        .into()
36}