Macro debug_fn 

macro_rules! debug_fn {
    ($fmt:literal $(, $arg:expr)* $(,)?) => { ... };
}

Dynamic debug macro. When dynamic_debug feature is enabled, uses per-callsite static key for runtime control via /proc/dynamic_debug/control, and also prints the function name of the callsite. Otherwise falls back to log::debug!.

Note

This macro depends on the derive macro #[ddebug::named] to work, which will set the function name for the debug site.