Macro TraceStep 

macro_rules! TraceStep {
    ($($arg:tt)*) => { ... };
}

Logs a checkpoint message at TRACE level (for “every step” tracing).

This macro provides a low-intrusion way to trace execution flow through the application startup and shutdown sequences. It expands to a single dev_log!(“lifecycle”, ) call which incurs zero overhead when TRACE logging is disabled.

Example

TraceStep!("[Boot] [Runtime] Building Tokio runtime...");
TraceStep!("[Boot] [Setup] Configuration loaded: {}", ConfigPath);