let x = 1;
// Flow In
let = arr;
// ^ defined: 1
// have to use assignment patterns here to get flow in
// Flow Out
let = arr;
/**/ z;
// ^ defined: 12
// Flow Around
/**/ x;
// ^ defined: 1
// Flow In From RHS
let = x++;
// ^ defined: 1, 25
// have to use assignment patterns here to get flow out
// Flow Into Subsequent Patterns From Earlier Patterns
let = arr;
// ^ defined: 31