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Update std.md

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Addition a mention of existence of `core` Standard Library.
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Igor Petruk 2023-01-21 22:09:53 +00:00 committed by Andrew Walbran
parent 66509f2f3e
commit 567a570d59
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src/std.md
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@ -19,3 +19,12 @@ The common vocabulary types include:
* [`Box`](std/box.md): an owned pointer for heap-allocated data.
* [`Rc`](std/rc.md): a shared reference-counted pointer for heap-allocated data.
<details>
* In fact, Rust contains two layers of the Standard Library: `core` and `std`.
* `core` includes the most basic types and functions that don't depend on `libc`, allocator or
even a presense of the operating system.
* Embedded Rust applications often only use `core`.
</details>