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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+% Ownership
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Ownership is Rust’s most unique feature, and it enables Rust to make memory safety guarantees without needing a garbage collector.
+>
+> 1. Each value in Rust has a variable that’s called its _owner_.
+> 2. There can only be one owner at a time.
+> 3. When the owner goes out of scope, the value will be dropped.
+
+---
+
+Here are the relevant sections in the new and old books:
+
+* **[in the current edition: Ch 4.00 — Understanding Ownership][2]**
+* <small>[In the first edition: Ch 3.8 — Ownership][1]</small>
+
+
+[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/ownership.html
+[2]: ch04-00-understanding-ownership.html