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Various types of iterators are often provided via a container's interface.
Alternative implementations of stream include data-driven languages, such as AWK and sed.Note that this rule, like all other rules, is an “as if” rule.As long as the resulting semantics match what the rules dictate, the actual implementation can be anything. It does not matter if an index was obtained from the collection instance, or derived from input or unrelated data. Using an invalid index to designate elements of an array or an array slice is guaranteed to perform a trap.(Possibilities include trapping, performing the operation on an arbitrary element of this or any other collection etc.) Concrete collection types can specify behavior; implementations are advised to perform a trap.An arbitrary index instance is not valid for an arbitrary collection instance.