struct RangeIteratorThe shared integer iterator for half-open and closed ranges.
inclusive_upper controls whether equality with upper yields one final value. done records exhaustion explicitly so Int.max can be a closed endpoint without incrementing to an unrepresentable sentinel.
Properties
let lower: Int
The inclusive lower bound.
let upper: Int
The terminal bound shared by half-open and inclusive iteration.
let inclusive_upper: Bool
Whether equality with upper still yields one final value.
let current: Int
The current value.
let done: Bool
Explicit exhaustion: a closed range ending at Int's maximum has no out-of-range sentinel to advance to (incrementing would wrap).