[Issue 14001] Optionally @nogc std.random.randomCover

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14001

--- Comment #1 from bearophile_hugs at eml.cc ---
In many use cases you don't need allocations, if you reserve a size_t inside
the RandomCover struct, and you use such size_t as a bit array, you can manage
the cases where the input 'r' is up to 32 or 64 items long without need of any
array buf.

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