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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+% Procedural Macros (and custom Derive)
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Procedural macros allow for all sorts of advanced metaprogramming in Rust.
+
+---
+
+This chapter does not exist yet in [the second edition][2].
+You can check out other resources that describe macros.
+
+* **[In the current edition: Ch 19.06 Macros][2]**
+* [In the Rust Reference: Ch 3.2 — Procedural Macros][4]
+* [The `proc_macro` crate documentation][3]
+* <small>[In the first edition: Ch 4.13 — Procedural Macros (and custom Derive)][1]</small>
+
+
+[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/procedural-macros.html
+[2]: ch19-06-macros.html
+[3]: ../proc_macro/index.html
+[4]: ../reference/procedural-macros.html