implement: src/lifetimes -- borrowed player refs, lifetime annotations

[BryanChasko]

topic: lifetimes

lifetimes are rust-only -- no python equivalent. they let the compiler verify
that borrowed references don't outlive the data they point to.

concepts to demonstrate

• lifetime annotation syntax: fn longest<'a>(x: &'a str, y: &'a str) -> &'a str
• struct fields with lifetime parameters
• the borrow checker: why rust catches use-after-free at compile time
• 'static lifetime

patriots theme

ScoutReport<'a> struct holding a reference to a Player from the roster vec.
function returning the player with the longer career that borrows from two slices.

file

src/lifetimes/scout_report.rs

note

this module has no python equivalent. use it to show what rust gives you that python can't.