****** Fatal Error: Cannot use an uppercase letter inside such an identifier. Yes, this rule is strict, but it is better for all of us to be able to distinguish at a glance a CLASS_NAME from another name. Furthermore, it would be really too bad for example to use `IsEmpty' or `isEmpty' at one place while all other places are using `is_empty'. Finally, this strict constraint will help us to improve error messages of the compiler. Line 7 column 8 in BAD_NAME3 (/home/cadrian/Workspace/Dev/Liberty/test/language/error_warning_msg/bad_name3.e): thisIsWrong ^ ------