proc-macro-error 1.0.4

Almost drop-in replacement to panics in proc-macros
Documentation 
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use proc_macro_error::*;

#[test]
#[should_panic = "proc-macro-error API cannot be used outside of"]
fn missing_attr_emit() {
    emit_call_site_error!("You won't see me");
}

#[test]
#[should_panic = "proc-macro-error API cannot be used outside of"]
fn missing_attr_abort() {
    abort_call_site!("You won't see me");
}