Quelle  macros.rs

macro_rules! test_println {
    ($($arg:tt)*) => {
        if cfg!(test) && cfg!(slab_print) {
            if std::thread::panicking() {
                // getting the thread ID while panicking doesn't seem to play super nicely with loom's
                // mock lazy_static...
                println!("[PANIC {:>17}:{:<3}] {}", file!(), line!(), format_args!($($arg)*))
            } else {
                println!("[{:?} {:>17}:{:<3}] {}", crate::Tid::<crate::DefaultConfig>::current(), file!(), line!(), format_args!($($arg)*))
            }
        }
    }
}

#[cfg(all(test, loom))]
macro_rules! test_dbg {
    ($e:expr) => {
        match $e {
            e => {
                test_println!("{} = {:?}", stringify!($e), &e);
                e
            }
        }
    };
}

macro_rules! panic_in_drop {
    ($($arg:tt)*) => {
        if !std::thread::panicking() {
            panic!($($arg)*)
        } else {
            let thread = std::thread::current();
            eprintln!(
                "thread '{thread}' attempted to panic at '{msg}', {file}:{line}:{col}\n\
                note: we were already unwinding due to a previous panic.",
                thread = thread.name().unwrap_or("<unnamed>"),
                msg = format_args!($($arg)*),
                file = file!(),
                line = line!(),
                col = column!(),
            );
        }
    }
}

macro_rules! debug_assert_eq_in_drop {
    ($this:expr, $that:expr) => {
        debug_assert_eq_in_drop!(@inner $this, $that, "")
    };
    ($this:expr, $that:expr, $($arg:tt)+) => {
        debug_assert_eq_in_drop!(@inner $this, $that, format_args!(": {}", format_args!($($arg)+)))
    };
    (@inner $this:expr, $that:expr, $msg:expr) => {
        if cfg!(debug_assertions) {
            if $this != $that {
                panic_in_drop!(
                    "assertion failed ({} == {})\n  left: `{:?}`,\n right: `{:?}`{}",
                    stringify!($this),
                    stringify!($that),
                    $this,
                    $that,
                    $msg,
                )
            }
        }
    }
}