On Tuesday, 24 August 2021 at 09:15:23 UTC, bauss wrote:
A range should be a struct always and thus its state is copied when the foreach loop is created.
That's quite a strong assumption, because its state might be a reference type, or it might not _have_ state in a meaningful sense -- consider an input range that wraps reading from a socket, or that just reads from `/dev/urandom`, for two examples.
Deterministic copying per foreach loop is only guaranteed for forward ranges.
