Auto merge of #69115 - ehuss:update-books, r=Dylan-DPC

Update books.

This required some changes in how the books are tested due to some changes in rust-lang/book.  It uses new syntax that is not compatible with bare `rustdoc --test`.  This changes it so that it uses rustbook to run the tests, which is essentially the same as `mdbook test`.

## reference

7 commits in 11e893fc1357bc688418ddf1087c2b7aa25d154d..64239df6d173562b9deb4f012e4c3e6e960c4754
2020-01-18 21:24:08 +0100 to 2020-02-10 19:05:13 +0100
- Update for nested receivers. (rust-lang-nursery/reference#724)
- clarify note re. leading `::` in 2018 (rust-lang-nursery/reference#752)
- Update macro-ambiguity.md (rust-lang-nursery/reference#754)
- typo fix: add missing `by` (rust-lang-nursery/reference#753)
- fix `TypeParamBounds` link on trait objects (rust-lang-nursery/reference#749)
- reorganize docs on references (rust-lang-nursery/reference#745)
- add MacroRepOp usage for ? (rust-lang-nursery/reference#744)

## book

49 commits in 87dd6843678575f8dda962f239d14ef4be14b352..6fb3705e5230311b096d47f7e2c91f9ce24393d0
2020-01-20 15:20:40 -0500 to 2020-02-12 13:48:57 -0500
- Fix nomicon links. (rust-lang/book#2253)
- Update to Rust 1.41.0 (rust-lang/book#2244)
- Listing 19-6: use ptr.add instead of ptr.offset (rust-lang/book#2201)
- Remove unneeded mutable reference
- Clarify deref coercion explanation
- Fix typo in link to 1.30 book
- Acknowledge Murphy's Law
- Clarify that buffer overread is UB in C
- Change from "must" to "idiomatic" about comments
- Fancy quotes
- Make HashMap types match previous example; add fwd ref to ch 13
- Tweak wording to array clarification
- Merge remote-tracking branch 'origin/pr/2236'
- Update all our crates (rust-lang/book#2235)
- Reword git caveat
- Merge remote-tracking branch 'origin/pr/2234'
- Merge remote-tracking branch 'origin/pr/2230'
- println! is a macro (rust-lang/book#2224)
- Update a translated version link (rust-lang/book#2221)
- move `Macro invocation` from section on tuple to section on mac… (rust-lang/book#2206)
- Do not limit `Self` usage in trait implementation (rust-lang/book#2197)
- Merge remote-tracking branch 'origin/pr/2191'
- Fix wrapping
- Merge remote-tracking branch 'origin/pr/2187'
- Updated appendix 07 to reflect deprecation of rustup install (rust-lang/book#2181)
- Make links to the Nomicon consistent
- Merge remote-tracking branch 'origin/pr/2180'
- Merge remote-tracking branch 'origin/pr/2175'
- Merge remote-tracking branch 'origin/pr/2171'
- Merge remote-tracking branch 'origin/pr/2170'
- Clarify and make consistent the explanation of unions
- Merge remote-tracking branch 'origin/pr/2166'
- Handle dev or test in the Finished output line
- Link to macros by example rather than macros (rust-lang/book#2164)
- Merge remote-tracking branch 'origin/pr/2147'
- Fix parens (rust-lang/book#2132)
- Clarify type inference with closures requires calling the closures
- Update link to French translation (rust-lang/book#2119)
- Merge remote-tracking branch 'origin/pr/2108'
- Add an explicit cross reference to data type
- Merge remote-tracking branch 'origin/pr/2105'
- ch15-02-deref: Improve explanation on immut-to-mut (rust-lang/book#2030)
- Remove unnecessary quotes
- Make markdown link identifier match
- Remove extra newline
- Merge remote-tracking branch 'origin/pr/2004'
- Extract code and output; script formatting and updating them (rust-lang/book#2231)
- Switch "Finally" to "Next" to reflect new chapters having been… (rust-lang/book#2098)
- ch19-06 added curly braces to macro output (rust-lang/book#2050)

## rust-by-example

2 commits in 1c2bd024d13f8011307e13386cf1fea2180352b5..32facd5522ddbbf37baf01e4e4b6562bc55c071a
2020-01-20 12:18:36 -0300 to 2020-02-11 09:25:06 -0300
- Add missing `dyn` in code sample (rust-lang/rust-by-example#1306)
- Improve grammar in a few sections (rust-lang/rust-by-example#1305)

## edition-guide

1 commits in 1a2390247ad6d08160e0dd74f40a01a9578659c2..37f9e6848411188a1062ead1bd8ebe4b8aa16899
2019-12-29 10:40:55 -0800 to 2020-02-10 14:36:14 +0100
- Fixed typo (rust-lang-nursery/edition-guide#196)

## embedded-book

4 commits in 4d78994915af1bde9a95c04a8c27d8dca066232a..b2e1092bf67bd4d7686c4553f186edbb7f5f92db
2020-01-14 08:25:25 +0000 to 2020-01-30 08:45:46 +0000
- Make typestate initialization notes correct  (rust-embedded/book#224)
- Mention discovery book more prominently  (rust-embedded/book#219)
- Replace nursery links with rust-lang links  (rust-embedded/book#222)
- Add a Glossary appendix page  (rust-embedded/book#223)

1 files changed, 27 insertions, 7 deletions

diff --git a/src/tools/rustbook/src/main.rs b/src/tools/rustbook/src/main.rs
index 226779ad0c0..01f324f0c5a 100644
--- a/src/tools/rustbook/src/main.rs
+++ b/src/tools/rustbook/src/main.rs
@@ -26,6 +26,11 @@ fn main() {
                 .arg_from_usage(dir_message),
         )
         .subcommand(
+            SubCommand::with_name("test")
+                .about("Tests that a book's Rust code samples compile")
+                .arg_from_usage(dir_message),
+        )
+        .subcommand(
             SubCommand::with_name("linkcheck")
                 .about("Run linkcheck with mdBook 3")
                 .arg_from_usage(dir_message),
@@ -36,13 +41,12 @@ fn main() {
     match matches.subcommand() {
         ("build", Some(sub_matches)) => {
             if let Err(e) = build(sub_matches) {
-                eprintln!("Error: {}", e);
-
-                for cause in e.iter().skip(1) {
-                    eprintln!("\tCaused By: {}", cause);
-                }
-
-                ::std::process::exit(101);
+                handle_error(e);
+            }
+        }
+        ("test", Some(sub_matches)) => {
+            if let Err(e) = test(sub_matches) {
+                handle_error(e);
             }
         }
         ("linkcheck", Some(sub_matches)) => {
@@ -148,6 +152,12 @@ pub fn build(args: &ArgMatches<'_>) -> Result3<()> {
     Ok(())
 }
 
+fn test(args: &ArgMatches<'_>) -> Result3<()> {
+    let book_dir = get_book_dir(args);
+    let mut book = MDBook::load(&book_dir)?;
+    book.test(vec![])
+}
+
 fn get_book_dir(args: &ArgMatches<'_>) -> PathBuf {
     if let Some(dir) = args.value_of("dir") {
         // Check if path is relative from current dir, or absolute...
@@ -157,3 +167,13 @@ fn get_book_dir(args: &ArgMatches<'_>) -> PathBuf {
         env::current_dir().unwrap()
     }
 }
+
+fn handle_error(error: mdbook::errors::Error) -> ! {
+    eprintln!("Error: {}", error);
+
+    for cause in error.iter().skip(1) {
+        eprintln!("\tCaused By: {}", cause);
+    }
+
+    ::std::process::exit(101);
+}