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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diff --git a/src/doc/book/redirects/const-and-static.md b/src/doc/book/redirects/const-and-static.md
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+% `const` and `static`
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Constants are _always_ immutable, and may only be set to a constant expression, not the result of a function call or any other value that could only be computed at runtime.
+>
+> Global variables are called `static` in Rust.
+
+```rust
+const MAX_POINTS: u32 = 100_000;
+static HELLO_WORLD: &str = "Hello, world!";
+```
+
+---
+
+You can find the latest version about constants
+[here](ch03-01-variables-and-mutability.html#constants),
+and about statics
+[here](ch19-01-unsafe-rust.html#accessing-or-modifying-a-mutable-static-variable).
+
+