proc-macro-error 1.0.4

Almost drop-in replacement to panics in proc-macros
Documentation 
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extern crate test_crate;
use test_crate::*;

abort_from!(one, two);
abort_to_string!(one, two);
abort_format!(one, two);
direct_abort!(one, two);
abort_notes!(one, two);
abort_call_site_test!(one, two);

fn main() {}