Key Points:

• All four methods here use a different method receiver.
  • You can point out how that changes what the function can do with the variable values and if/how it can be used again in main.
  • You can showcase the error that appears when trying to call finish twice.
• Note that although the method receivers are different, the non-static functions are called the same way in the main body. Rust enables automatic referencing and dereferencing when calling methods. Rust automatically adds in the &, *, muts so that that object matches the method signature.
• You might point out that print_laps is using a vector that is iterated over. We describe vectors in more detail in the afternoon.