Macro slog::slog_crit

macro_rules! slog_crit {
    ($l:expr, #$tag:expr, $($args:tt)+) => { ... };
    ($l:expr, $($args:tt)+) => { ... };
}

Log critical level record (alias)

Prefer shorter version, unless it clashes with existing log crate macro.

See slog_log for documentation.