↰ base.iter.IterScanner[E,R,S]

• base.iter.Iter/1
• base.iter.IterFolder/2
• base.iter.IterForEacher/1
• base.iter.IterMapper/2
• base.iter.IterPredicate/1
• base.iter.IterScanner/3
• base.iter.Sum/0

mut #(state: mut base.Var[S], e: E): S,