What happens when you invoke a method on a nil pointer?

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1. #function
2. #every
3. #method
4. #filled
5. #defined
6. #harryfeng
7. #happens
8. #returned
9. #structure
10. #pointer
11. #types
12. #returns
13. #message
14. #invoke
15. #guide
16. #struct
17. #zeros
18. #registers
19. #other
20. #field