Utilize Result::unwrap_err in more places.

src/libcollectionstest/string.rs

@@ -52,7 +52,7 @@ fn test_from_utf8() {
                String::from("ศไทย中华Việt Nam"));
 
     let xs = b"hello\xFF".to_vec();
-    let err = String::from_utf8(xs).err().unwrap();
+    let err = String::from_utf8(xs).unwrap_err();
     assert_eq!(err.into_bytes(), b"hello\xff".to_vec());
 }
 

src/libserialize/json.rs

@@ -3948,7 +3948,7 @@ mod tests {
         let mut mem_buf = string::String::new();
         let mut encoder = Encoder::new(&mut mem_buf);
         let result = hm.encode(&mut encoder);
-        match result.err().unwrap() {
+        match result.unwrap_err() {
             EncoderError::BadHashmapKey => (),
             _ => panic!("expected bad hash map key")
         }

src/libstd/fs.rs

@@ -1772,7 +1772,7 @@ mod tests {
         let tmpdir = tmpdir();
         let dir = &tmpdir.join("mkdir_error_twice");
         check!(fs::create_dir(dir));
-        let e = fs::create_dir(dir).err().unwrap();
+        let e = fs::create_dir(dir).unwrap_err();
         assert_eq!(e.kind(), ErrorKind::AlreadyExists);
     }
 

src/libstd/io/buffered.rs

@@ -1127,7 +1127,7 @@ mod tests {
             let mut writer = BufWriter::new(PanicWriter);
             let _ = writer.write(b"hello world");
             let _ = writer.flush();
-        }).join().err().unwrap();
+        }).join().unwrap_err();
 
         assert_eq!(WRITES.load(Ordering::SeqCst), 1);
     }

src/libstd/sync/mpsc/mod.rs

@@ -535,7 +535,7 @@ impl<T> Sender<T> {
     ///
     /// // This send will fail because the receiver is gone
     /// drop(rx);
-    /// assert_eq!(tx.send(1).err().unwrap().0, 1);
+    /// assert_eq!(tx.send(1).unwrap_err().0, 1);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn send(&self, t: T) -> Result<(), SendError<T>> {

src/libterm/terminfo/parm.rs

@@ -594,7 +594,7 @@ mod test {
             assert!(res.is_ok(),
                     "Op {} failed with 1 stack entry: {}",
                     cap,
-                    res.err().unwrap());
+                    res.unwrap_err());
         }
         let caps = ["%+", "%-", "%*", "%/", "%m", "%&", "%|", "%A", "%O"];
         for &cap in caps.iter() {
@@ -610,7 +610,7 @@ mod test {
             assert!(res.is_ok(),
                     "Binop {} failed with 2 stack entries: {}",
                     cap,
-                    res.err().unwrap());
+                    res.unwrap_err());
         }
     }
 
@@ -625,15 +625,15 @@ mod test {
         for &(op, bs) in v.iter() {
             let s = format!("%{{1}}%{{2}}%{}%d", op);
             let res = expand(s.as_bytes(), &[], &mut Variables::new());
-            assert!(res.is_ok(), res.err().unwrap());
+            assert!(res.is_ok(), res.unwrap_err());
             assert_eq!(res.unwrap(), vec![b'0' + bs[0]]);
             let s = format!("%{{1}}%{{1}}%{}%d", op);
             let res = expand(s.as_bytes(), &[], &mut Variables::new());
-            assert!(res.is_ok(), res.err().unwrap());
+            assert!(res.is_ok(), res.unwrap_err());
             assert_eq!(res.unwrap(), vec![b'0' + bs[1]]);
             let s = format!("%{{2}}%{{1}}%{}%d", op);
             let res = expand(s.as_bytes(), &[], &mut Variables::new());
-            assert!(res.is_ok(), res.err().unwrap());
+            assert!(res.is_ok(), res.unwrap_err());
             assert_eq!(res.unwrap(), vec![b'0' + bs[2]]);
         }
     }
@@ -643,13 +643,13 @@ mod test {
         let mut vars = Variables::new();
         let s = b"\\E[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38;5;%p1%d%;m";
         let res = expand(s, &[Number(1)], &mut vars);
-        assert!(res.is_ok(), res.err().unwrap());
+        assert!(res.is_ok(), res.unwrap_err());
         assert_eq!(res.unwrap(), "\\E[31m".bytes().collect::<Vec<_>>());
         let res = expand(s, &[Number(8)], &mut vars);
-        assert!(res.is_ok(), res.err().unwrap());
+        assert!(res.is_ok(), res.unwrap_err());
         assert_eq!(res.unwrap(), "\\E[90m".bytes().collect::<Vec<_>>());
         let res = expand(s, &[Number(42)], &mut vars);
-        assert!(res.is_ok(), res.err().unwrap());
+        assert!(res.is_ok(), res.unwrap_err());
         assert_eq!(res.unwrap(), "\\E[38;5;42m".bytes().collect::<Vec<_>>());
     }
 

src/test/run-make/static-unwinding/main.rs

@@ -25,7 +25,7 @@ fn main() {
     thread::spawn(move|| {
         let _a = A;
         lib::callback(|| panic!());
-    }).join().err().unwrap();
+    }).join().unwrap_err();
 
     unsafe {
         assert_eq!(lib::statik, 1);

src/test/run-pass/command-before-exec.rs

@@ -62,7 +62,7 @@ fn main() {
 
     let output = Command::new(&me).arg("bad").before_exec(|| {
         Err(Error::from_raw_os_error(102))
-    }).output().err().unwrap();
+    }).output().unwrap_err();
     assert_eq!(output.raw_os_error(), Some(102));
 
     let pid = unsafe { libc::getpid() };

src/test/run-pass/no-landing-pads.rs

@@ -27,6 +27,6 @@ fn main() {
     thread::spawn(move|| -> () {
         let _a = A;
         panic!();
-    }).join().err().unwrap();
+    }).join().unwrap_err();
     assert!(unsafe { !HIT });
 }

src/test/run-pass/panic-recover-propagate.rs

@@ -28,10 +28,10 @@ fn main() {
             panic!("hi there");
         });
 
-        panic::propagate(result.err().unwrap());
+        panic::propagate(result.unwrap_err());
     }).join();
 
-    let msg = *result.err().unwrap().downcast::<&'static str>().unwrap();
+    let msg = *result.unwrap_err().downcast::<&'static str>().unwrap();
     assert_eq!("hi there", msg);
     assert_eq!(1, A.load(Ordering::SeqCst));
 }

src/test/run-pass/sepcomp-unwind.rs

@@ -39,5 +39,5 @@ mod b {
 }
 
 fn main() {
-    thread::spawn(move|| { ::b::g() }).join().err().unwrap();
+    thread::spawn(move|| { ::b::g() }).join().unwrap_err();
 }

src/test/run-pass/terminate-in-initializer.rs

@@ -24,13 +24,13 @@ fn test_ret() { let _x: Box<isize> = return; }
 
 fn test_panic() {
     fn f() { let _x: Box<isize> = panic!(); }
-    thread::spawn(move|| f() ).join().err().unwrap();
+    thread::spawn(move|| f() ).join().unwrap_err();
 }
 
 fn test_panic_indirect() {
     fn f() -> ! { panic!(); }
     fn g() { let _x: Box<isize> = f(); }
-    thread::spawn(move|| g() ).join().err().unwrap();
+    thread::spawn(move|| g() ).join().unwrap_err();
 }
 
 pub fn main() {

src/test/run-pass/unit-like-struct-drop-run.rs

@@ -30,6 +30,6 @@ pub fn main() {
         let _b = Foo;
     }).join();
 
-    let s = x.err().unwrap().downcast::<&'static str>().unwrap();
+    let s = x.unwrap_err().downcast::<&'static str>().unwrap();
     assert_eq!(&**s, "This panic should happen.");
 }