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proc ::ruff::app::log_error {msg} {

    # Stub function to log Ruff! errors.
    # msg - the message to be logged
    #
    # When Ruff! encounters errors, it calls this command to
    # notify the user. By default, the command writes $msg
    # to stderr output. An application using the ruff package
    # can redefine this command after loading ruff.
    puts stderr "$msg"
}