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When to use `ref` in #Rust?
Probably only in `match` and `if let` if the borrow checker shouts at you. These are the same:
let ref x = y;
let x = &y;
`ref` is the way of saying you want to make a reference when you can only write the left side (the pattern) of the assignment.
In patterns `&` means you *expect* to see a reference, but it doesn't *make* one. These are the same:
let x = y;
let &x = &y;
Try it: https://is.gd/DIMRXy
