Macro `trace`

macro_rules! trace {
    (logger: $logger:expr, target: $target:expr, $($arg:tt)+) => { ... };
    (logger: $logger:expr, $($arg:tt)+) => { ... };
    (target: $target:expr, $($arg:tt)+) => { ... };
    ($($arg:tt)+) => { ... };
}

Logs a message at the trace level.

Examples

use log::trace;

# let my_logger = log::__private_api::GlobalLogger;
# struct Position { x: f32, y: f32 }
let pos = Position { x: 3.234, y: -1.223 };

trace!("Position is: x: {}, y: {}", pos.x, pos.y);
trace!(target: "app_events", "x is {} and y is {}",
       if pos.x >= 0.0 { "positive" } else { "negative" },
       if pos.y >= 0.0 { "positive" } else { "negative" });
trace!(logger: my_logger, "x is {} and y is {}",
       if pos.x >= 0.0 { "positive" } else { "negative" },
       if pos.y >= 0.0 { "positive" } else { "negative" });