proc-macro-error 0.4.8

Almost drop-in replacement to panics in proc-macros
Documentation 
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extern crate rustversion;
extern crate trybuild;

#[rustversion::attr(any(before(1.39), not(stable)), ignore)]
#[test]
fn ui() {
    let t = trybuild::TestCases::new();
    t.compile_fail("tests/ui/*.rs");
}