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add next_index to Enumerate Proposal: https://github.com/rust-lang/libs-team/issues/435 Tracking Issue: #130711 This basically just reopens #130682 but squashed and with the new function and the feature gate renamed to `next_index.` There are two questions I have already: - Shouldn't we add test coverage for that? I'm happy to provide some, but I might need a pointer to where these test would be. - Maybe I could actually also add a doctest? - For now, I just renamed the feature name in the unstable attribute to `next_index`, as well, so it matches the new name of the function. Is that okay? And can I just do that and use any string, or is there a sealed list of features defined somewhere where I also need to change the name?