struct

1. Create simple struct
2. Change attributes of a mutable struct
3. Implement a method for a struct
4. Struct method to modify fields
5. Struct inheritance
6. Struct composition: Circle
7. Struct composition: Line
8. Struct and type alias - Polygon
9. Struct with vector of structs - Polygon
10. Struct duplicate
11. Printing struct fails
12. Print struct
13. Debug struct
14. Derive Debug for struct
15. Print struct (Point)
16. Debug struct (Point)
17. Struct with vector and optional value
18. Printing and debug-printing simple struct
19. Use a tuple as a struct to represent color
20. Add method to tuple-based struct
21. Struct with method
22. Structs and circural references
23. Multiple referene to a struct
24. new method with default values for struct
25. The new method has no special feature
26. Default values
27. Default for composite struct
28. Compare structs for Equality
29. Compare structs for Equality - manual implementation
30. Compare structs for partial equality - PartialEq
31. Compare structs for ordering (sorting) - Ord
32. Compare structs for partial ordering (sorting) - PartialOrd
33. Manually implement ordering