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Stuart Cook
eb101bb2f1
Add overview documentation for `std::mem`. I heard that `std::mem` sounds scary to some people, and how it’s described — “Basic functions for dealing with memory” — sounds even to me like something that should be avoided, not even because it would be unsafe, but because it is too low-level. Let’s fix that by telling people about what they can actually find in the module, without having to read all the individual item descriptions. The exact contents of the list are, of course, highly debatable, and I chose not to include any of the unstable or deprecated items, nor to include `Discriminant` as well as `discriminant`. I’m also not particularly happy with the wording of the introductory paragraph.