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It contains the re-exports that are in `std::prelude::v1`
but not in `core::prelude::v1`.
Calling it prelude is somewhat of a misnomer since (unlike those modules
in `std` or `core`) its contents are never implicitly imported in modules.
Rather it is intended to be used with an explicit glob import like
`use alloc::prelude::*;`.
However there is precedent for the same misnomer with `std::io::prelude`,
for example.
This new module is unstable with the same feature name as the `alloc` care.
They are proposed for stabilization together in RFC
rust-lang/rfcs#2480
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