Macro notify 

macro_rules! notify {
    (@level error) => { ... };
    (@level warn) => { ... };
    (@level info) => { ... };
    (@level success) => { ... };
    (@level debug) => { ... };
    ($level:ident, location = $loc:ident, stack = $stack:ident ($($sk:expr),+), $msg:expr $(, $arg:expr)* $(,)?) => { ... };
    ($level:ident, location = $loc:ident, lifecycle = $lc:ident, $msg:expr $(, $arg:expr)* $(,)?) => { ... };
    ($level:ident, location = $loc:ident, $msg:expr $(, $arg:expr)* $(,)?) => { ... };
    ($level:ident, target: $target:expr, $msg:expr $(, $arg:expr)* $(,)?) => { ... };
    ($level:ident, $msg:expr $(, $arg:expr)* $(,)?) => { ... };
    ($msg:expr $(, $arg:expr)* $(,)?) => { ... };
}

Emit a notification through the global notifier.

Syntax

notify!(level, "message {}", arg);
notify!(level, location = Toast, "message");
notify!(level, location = Status, stack = replace("key"), "message");
notify!(debug, target: "auto_snapshot", "snapshot {}", name);