Check for deadlinks from the summary during book generation

Previously, any deadlinks from a book's SUMMARY.md wouldn't
cause any errors or warnings or similar but mdbook would simply
create a page with blank content.

This has kept bug #47394 hidden. It should have been detected
back in the PR when those wrongly named files got added to the
book.

PR #47414 was one component of the solution. This change
is a second line of defense for the unstable book and a first
line of defense for any other book.

We also update mdbook to the most recent version.

3 files changed, 11 insertions, 9 deletions

diff --git a/src/Cargo.lock b/src/Cargo.lock
index 8fbf3535264..249fabea411 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -1114,7 +1114,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "mdbook"
-version = "0.0.26"
+version = "0.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "clap 2.29.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1697,7 +1697,7 @@ name = "rustbook"
 version = "0.1.0"
 dependencies = [
  "clap 2.29.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "mdbook 0.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mdbook 0.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2882,7 +2882,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum mac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 "checksum markup5ever 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "047150a0e03b57e638fc45af33a0b63a0362305d5b9f92ecef81df472a4cceb0"
 "checksum matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "100aabe6b8ff4e4a7e32c1c13523379802df0772b82466207ac25b013f193376"
-"checksum mdbook 0.0.26 (registry+https://github.com/rust-lang/crates.io-index)" = "8a1ac668292d1e5c7b1c6fd64f70d3a85105b8069a89558a0d67bdb2ff298ca1"
+"checksum mdbook 0.0.28 (registry+https://github.com/rust-lang/crates.io-index)" = "1ee8ba20c002000546681dc78d7f7e91fd35832058b1e2fdd492ca842bb6e9be"
 "checksum memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
 "checksum memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "148fab2e51b4f1cfc66da2a7c32981d1d3c083a803978268bb11fe4b86925e7a"
 "checksum memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "796fba70e76612589ed2ce7f45282f5af869e0fdd7cc6199fa1aa1f1d591ba9d"
diff --git a/src/tools/rustbook/Cargo.toml b/src/tools/rustbook/Cargo.toml
index 4aa096246bc..bc35cbe9fbb 100644
--- a/src/tools/rustbook/Cargo.toml
+++ b/src/tools/rustbook/Cargo.toml
@@ -8,5 +8,5 @@ license = "MIT/Apache-2.0"
 clap = "2.25.0"
 
 [dependencies.mdbook]
-version = "0.0.26"
+version = "0.0.28"
 default-features = false
diff --git a/src/tools/rustbook/src/main.rs b/src/tools/rustbook/src/main.rs
index a0c3e811a7a..50f4364e448 100644
--- a/src/tools/rustbook/src/main.rs
+++ b/src/tools/rustbook/src/main.rs
@@ -52,12 +52,14 @@ fn main() {
 // Build command implementation
 pub fn build(args: &ArgMatches) -> Result<()> {
     let book_dir = get_book_dir(args);
-    let book = MDBook::new(&book_dir).read_config()?;
+    let mut book = MDBook::new(&book_dir).read_config()?;
 
-    let mut book = match args.value_of("dest-dir") {
-        Some(dest_dir) => book.with_destination(dest_dir),
-        None => book,
-    };
+    // Set this to allow us to catch bugs in advance.
+    book.config.build.create_missing = false;
+
+    if let Some(dest_dir) = args.value_of("dest-dir") {
+        book.config.build.build_dir = PathBuf::from(dest_dir);
+    }
 
     book.build()?;