Can you add constants to an enum without breaking existing code?

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2. #breaking
3. #cannot
4. #switch
5. #compiler
6. #constants
7. #assign
8. #something
9. #inside
10. #without
11. #variable
12. #existing
13. #error
14. #other
15. #predefined
16. #assigning
17. #statement
18. #anything