Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+% Release Channels
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> The Rust project uses a concept called ‘release channels’ to manage releases.
+> New nightly releases are created once a day.
+> Every six weeks, the latest nightly release is promoted to ‘Beta’.
+> At that point, it will only receive patches to fix serious errors.
+> Six weeks later, the beta is promoted to ‘Stable’.
+
+---
+
+This chapter does not exist yet in [the second edition][2].
+You can check out other resources that describe release channels.
+
+* **[In the Rustup documentation: Keeping Rust Up-to-date][4]**
+* [On the website: Install Rust][5]
+* [In the Rust RFCs: RFC 507 — Release Channels][3]
+* [in the current edition: How Rust is Made and “Nightly Rust”][2]
+* <small>[In the first edition: Ch 4.11 — Release Channels][1]</small>
+
+
+[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/release-channels.html
+[2]: appendix-07-nightly-rust.html
+[3]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
+[4]: https://github.com/rust-lang-nursery/rustup.rs/blob/master/README.md#keeping-rust-up-to-date
+[5]: https://www.rust-lang.org/en-US/tools/install
+