Macro fail 

macro_rules! fail {
    ($($argument: tt),+ $(,)?) => { ... };
}

When enabled, will log an error and pause execution

Will only break once per program run

arguments are processed by Tracing’s error! macro (Tracing required)

When disabled, will log an error

Will log once per program run

Platforms other than x86, x86_64, and ARM64 Require Nightly Rust and the core_intrinsics feature

Examples

unbug::fail!("failed to do something");
unbug::fail!("failed to do something: {:?}", some_var);