CandleClock.ErrorLogger.log_message_and_error

You're seeing just the macro log_message_and_error, go back to CandleClock.ErrorLogger module for more information.
Link to this macro

log_message_and_error(message, error, log_level \\ :error, metadata \\ [])

View Source (macro)

Like log_error/3, but also puts the givenmessage before the formatted error.