From: W. Trevor King <wking@tremily.us>
Date: Mon, 8 Jan 2018 21:56:54 +0000 (-0800)
Subject: doc/guide/dependencies: Add a 'rust' language marker
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doc/guide/dependencies: Add a 'rust' language marker

This had been added to the non-book docs in 2ad45a56 ([doc] Sync back
doc/book changes into old docs, 2017-08-31, #4455), despite the fact
that the book didn't actually have that marker:

  $ git cat-file -p 2ad45a56:src/doc/book/src/guide/dependencies.md | grep -A2 'You can now use the'
  You can now use the `regex` library using `extern crate` in `main.rs`.

  ```
---

diff --git a/src/doc/src/guide/dependencies.md b/src/doc/src/guide/dependencies.md
index e199487f2..fc16eb614 100644
--- a/src/doc/src/guide/dependencies.md
+++ b/src/doc/src/guide/dependencies.md
@@ -70,7 +70,7 @@ we choose to `cargo update`.
 
 You can now use the `regex` library using `extern crate` in `main.rs`.
 
-```
+```rust
 extern crate regex;
 
 use regex::Regex;