Macro slog_scope::slog_trace

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

Log trace level record (alias)

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

See slog_log for documentation.