compile_msg 0.1.5

A plugin for emitting errors, warnings and notes to the developer at compile time. 
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#![feature(plugin)]

#[plugin] extern crate compile_msg;

#[cfg(rare)]
compile_note!("only emitted with --cfg rate");

fn main() {
    compile_note!("useful information: ", 1, " instance");

    compile_warning!("x");

    compile_error!("y");

    // compilation stops here
    compile_fatal!("z");

    compile_note!("not emitted")
}