You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: transition_coverage.rs
    path of file: ./repos/sdk-core/core/src/worker/workflow/machines
    
    the code of the file until where you have to start completion: //! Look, I'm not happy about the code in here, and you shouldn't be either. This is all an awful,
//! dirty hack to work around the fact that there's
    
pub fn add_coverage(machine_name: String, from_state: String, to_state: String, event: String) {
    let ct = CoveredTransition {
        from_state,
        to_state,
        event,
    };
    let _ = COVERAGE_SENDER.send((machine_name, ct));
}