Function backtrace

crates/core/tests/tests.rs:215–246

()

#[test]
#[cfg(feature = "backtrace")]
fn backtrace() {
    // Backtrace on OOM.
    let e = Error::from(OutOfMemory::new(5));
    assert_eq!(e.backtrace().status(), BacktraceStatus::Disabled);

    let backtraces_enabled =
        match std::env::var("RUST_LIB_BACKTRACE").or_else(|_| std::env::var("RUST_BACKTRACE")) {
            Err(_) => false,
            Ok(s) if s == "0" => false,
            Ok(_) => true,
        };

    let assert_backtrace = |e: Error| {
        if backtraces_enabled {
            assert!(matches!(
                e.backtrace().status(),
                BacktraceStatus::Unsupported | BacktraceStatus::Captured
            ));
        } else {
            assert_eq!(e.backtrace().status(), BacktraceStatus::Disabled);
        }
    };

    // Backtrace on `Error::msg`.
    assert_backtrace(Error::msg("whoops"));

    // Backtrace on `Error::new`.
    assert_backtrace(Error::new(TestError(42)));

    // Backtrace on context chain.
    assert_backtrace(Error::new(TestError(42)).context("yikes"));
}

#[test]
fn format_err_macro_string_literal() {