↰ base.iter.IterFolder[E:imm,mut,read,R:imm,mut,read]
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 #(acc: R, e: E): R,