Bug 23453 – Generic iota should be a forward range

As of Phobos v2.100.2, the generic version of std.range.iota used for non-numeric types is not a forward range, because it does not implement the `save` method: --- import std.range; void main() { auto r1 = iota('a', 'z'); auto r2 = r1.save; // Error } --- However, iota stores all of its state internally, and copies of it can be iterated independently: --- import std.range; void main() { auto r1 = iota('a', 'z'); auto r2 = r1; r1.popFront; assert(r2.front == 'a'); // OK } --- Since it is already effectively a forward range in practice, iota should implement `save` and make this functionality available to generic algorithms.

@pbackus created dlang/phobos pull request #8619 "Fix 23453 - Generic iota should be a forward range" fixing this issue: - Fix 23453 - Generic iota should be a forward range https://github.com/dlang/phobos/pull/8619

dlang/phobos pull request #8619 "Fix 23453 - Generic iota should be a forward range" was merged into master: - be1dad3480b652f125c4d59fa5b3fb3bce4c5ec4 by Paul Backus: Fix 23453 - Generic iota should be a forward range https://github.com/dlang/phobos/pull/8619