let and irrefutable pattern matching

[jonathanpallant]

We should note that let can do irrefutable pattern matching. This is how tuple and struct destructuring works. It does not work with enum.

struct Point(i32, i32);

let p = (1, 2);
let (x,y) = p;
let p = Point(1, 2);
let Point(x, y) = p;