exit_safely 0.3.3

exit safely with custom exit codes while still calling `Drop` as needed. Aims for minimal magic and maximum flexibilty.
Documentation 
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use trybuild::TestCases;

#[cfg(has_proc_macro_diagnostic)]
static PATH: &str = "./examples/nightly/examples/fail_*.rs";
#[cfg(not(has_proc_macro_diagnostic))]
static PATH: &str = "./examples/stable/examples/fail_*.rs";

#[test]
fn failures() {
    let t = TestCases::new();
    t.compile_fail(PATH);
}