Small cleanups extracted from the bigger pr i'm working on

.travis.yml

@@ -13,6 +13,6 @@ addons:
       - aspell
       - aspell-en
 before_script:
-  - (cargo install mdbook --vers 0.2.3 --force || true)
+  - (cargo install mdbook --vers 0.3.5 --force || true)
 script:
   - bash ci/build.sh

Cargo.toml

@@ -9,6 +9,10 @@ edition = "2018"
 name = "concat_chapters"
 path = "tools/src/bin/concat_chapters.rs"
 
+[[bin]]
+name = "convert_quotes"
+path = "tools/src/bin/convert_quotes.rs"
+
 [[bin]]
 name = "lfp"
 path = "tools/src/bin/lfp.rs"
@@ -25,10 +29,6 @@ path = "tools/src/bin/remove_links.rs"
 name = "remove_markup"
 path = "tools/src/bin/remove_markup.rs"
 
-[[bin]]
-name = "convert_quotes"
-path = "tools/src/bin/convert_quotes.rs"
-
 [dependencies]
 walkdir = "0.1.5"
 docopt = "0.6.82"

README.md

@@ -4,7 +4,7 @@
 
 This repository contains the source of "The Rust Programming Language" book.
 
-[The book is available in dead-tree form from No Starch Press][nostarch]
+[The book is available in dead-tree form from No Starch Press][nostarch].
 
 [nostarch]: https://nostarch.com/rust
 
@@ -17,6 +17,10 @@ releases are updated less frequently.
 [beta]: https://doc.rust-lang.org/beta/book/
 [nightly]: https://doc.rust-lang.org/nightly/book/
 
+See the [releases] to download just the code of all the code listings that appear in the book.
+
+[releases]: https://github.com/rust-lang/book/releases
+
 ## Requirements
 
 Building the book requires [mdBook], ideally the same 0.3.x version that

src/ch04-02-references-and-borrowing.md

@@ -234,11 +234,7 @@ through the last time that reference is used. For instance, this code will
 compile because the last usage of the immutable references occurs before the
 mutable reference is introduced:
 
-<!-- This example is being ignored because there's a bug in rustdoc making the
-edition2018 not work. The bug is currently fixed in nightly, so when we update
-the book to >= 1.35, `ignore` can be removed from this example. -->
-
-```rust,edition2018,ignore
+```rust,edition2018
 let mut s = String::from("hello");
 
 let r1 = &s; // no problem

tools/src/bin/remove_markup.rs

@@ -28,15 +28,8 @@ fn remove_markup(input: String) -> String {
     let regexen = vec![filename_regex, caption_start_regex, caption_end_regex];
 
     let lines: Vec<_> = input.lines().flat_map(|line| {
-        // Remove our figure and caption markup.
-        if line == "<figure>" ||
-            line == "<figcaption>" ||
-            line == "</figcaption>" ||
-            line == "</figure>"
-        {
-            None
         // Remove our syntax highlighting and rustdoc markers.
-        } else if line.starts_with("```") {
+        if line.starts_with("```") {
             Some(String::from("```"))
         // Remove the span around filenames and captions.
         } else {