style: rustfmt everything

This is why I was so intent on clearing the PR queue. This will
effectively invalidate all existing patches, so I wanted to start from a
clean slate.

We do make one little tweak: we put the default type definitions in
their own file and tell rustfmt to keep its grubby mits off of it. We
also sort it lexicographically and hopefully will enforce that from here
on.

tests/util.rs

@@ -72,19 +72,13 @@ impl Dir {
             .parent()
             .expect("executable's directory")
             .to_path_buf();
-        let dir = env::temp_dir()
-            .join(TEST_DIR)
-            .join(name)
-            .join(&format!("{}", id));
+        let dir =
+            env::temp_dir().join(TEST_DIR).join(name).join(&format!("{}", id));
         if dir.exists() {
             nice_err(&dir, fs::remove_dir_all(&dir));
         }
         nice_err(&dir, repeat(|| fs::create_dir_all(&dir)));
-        Dir {
-            root: root,
-            dir: dir,
-            pcre2: false,
-        }
+        Dir { root: root, dir: dir, pcre2: false }
     }
 
     /// Use PCRE2 for this test.
@@ -262,12 +256,10 @@ impl TestCommand {
     }
 
     /// Add any number of arguments to the command.
-    pub fn args<I, A>(
-        &mut self,
-        args: I,
-    ) -> &mut TestCommand
-    where I: IntoIterator<Item=A>,
-          A: AsRef<OsStr>
+    pub fn args<I, A>(&mut self, args: I) -> &mut TestCommand
+    where
+        I: IntoIterator<Item = A>,
+        A: AsRef<OsStr>,
     {
         self.cmd.args(args);
         self
@@ -292,8 +284,7 @@ impl TestCommand {
             Err(err) => {
                 panic!(
                     "could not convert from string: {:?}\n\n{}",
-                    err,
-                    stdout
+                    err, stdout
                 );
             }
         }
@@ -311,9 +302,7 @@ impl TestCommand {
         // risk of deadlock between parent and child process.
         let mut stdin = child.stdin.take().expect("expected standard input");
         let input = input.to_owned();
-        let worker = thread::spawn(move || {
-            stdin.write_all(&input)
-        });
+        let worker = thread::spawn(move || stdin.write_all(&input));
 
         let output = self.expect_success(child.wait_with_output().unwrap());
         worker.join().unwrap().unwrap();
@@ -324,8 +313,7 @@ impl TestCommand {
             Err(err) => {
                 panic!(
                     "could not convert from string: {:?}\n\n{}",
-                    err,
-                    stdout
+                    err, stdout
                 );
             }
         }
@@ -368,9 +356,7 @@ impl TestCommand {
              \n\nexpected: {}\
              \n\nfound: {}\
              \n\n=====\n",
-            self.cmd,
-            expected_code,
-            code
+            self.cmd, expected_code, code
         );
     }
 
@@ -396,14 +382,14 @@ impl TestCommand {
 
     fn expect_success(&self, o: process::Output) -> process::Output {
         if !o.status.success() {
-            let suggest =
-                if o.stderr.is_empty() {
-                    "\n\nDid your search end up with no results?".to_string()
-                } else {
-                    "".to_string()
-                };
+            let suggest = if o.stderr.is_empty() {
+                "\n\nDid your search end up with no results?".to_string()
+            } else {
+                "".to_string()
+            };
 
-            panic!("\n\n==========\n\
+            panic!(
+                "\n\n==========\n\
                     command failed but expected success!\
                     {}\
                     \n\ncommand: {:?}\
@@ -412,18 +398,19 @@ impl TestCommand {
                     \n\nstdout: {}\
                     \n\nstderr: {}\
                     \n\n==========\n",
-                   suggest, self.cmd, self.dir.dir.display(), o.status,
-                   String::from_utf8_lossy(&o.stdout),
-                   String::from_utf8_lossy(&o.stderr));
+                suggest,
+                self.cmd,
+                self.dir.dir.display(),
+                o.status,
+                String::from_utf8_lossy(&o.stdout),
+                String::from_utf8_lossy(&o.stderr)
+            );
         }
         o
     }
 }
 
-fn nice_err<T, E: error::Error>(
-    path: &Path,
-    res: Result<T, E>,
-) -> T {
+fn nice_err<T, E: error::Error>(path: &Path, res: Result<T, E>) -> T {
     match res {
         Ok(t) => t,
         Err(err) => panic!("{}: {:?}", path.display(), err),