pub const List = struct head: OptionalIndextail: OptionalIndex541
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549 pub const List = struct {
head: OptionalIndex,
tail: OptionalIndex,
pub const empty: List = .{ .head = .none, .tail = .none };
pub const SingleNode = struct { next: OptionalIndex };
pub const DoubleNode = struct { prev: OptionalIndex, next: OptionalIndex };
}