Use assert_ne in hash tests

The hash tests were written before the assert_ne macro was added to the standard library. The assert_ne macro provides better output in case of a failure.

src/libcore/tests/hash/sip.rs

@@ -238,7 +238,7 @@ fn test_siphash_2_4() {
 #[cfg(target_pointer_width = "32")]
 fn test_hash_usize() {
     let val = 0xdeadbeef_deadbeef_u64;
-    assert!(hash(&(val as u64)) != hash(&(val as usize)));
+    assert_ne!(hash(&(val as u64)), hash(&(val as usize)));
     assert_eq!(hash(&(val as u32)), hash(&(val as usize)));
 }
 
@@ -247,7 +247,7 @@ fn test_hash_usize() {
 fn test_hash_usize() {
     let val = 0xdeadbeef_deadbeef_u64;
     assert_eq!(hash(&(val as u64)), hash(&(val as usize)));
-    assert!(hash(&(val as u32)) != hash(&(val as usize)));
+    assert_ne!(hash(&(val as u32)), hash(&(val as usize)));
 }
 
 #[test]
@@ -262,14 +262,14 @@ fn test_hash_idempotent() {
 fn test_hash_no_bytes_dropped_64() {
     let val = 0xdeadbeef_deadbeef_u64;
 
-    assert!(hash(&val) != hash(&zero_byte(val, 0)));
-    assert!(hash(&val) != hash(&zero_byte(val, 1)));
-    assert!(hash(&val) != hash(&zero_byte(val, 2)));
-    assert!(hash(&val) != hash(&zero_byte(val, 3)));
-    assert!(hash(&val) != hash(&zero_byte(val, 4)));
-    assert!(hash(&val) != hash(&zero_byte(val, 5)));
-    assert!(hash(&val) != hash(&zero_byte(val, 6)));
-    assert!(hash(&val) != hash(&zero_byte(val, 7)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 0)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 1)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 2)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 3)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 4)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 5)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 6)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 7)));
 
     fn zero_byte(val: u64, byte: usize) -> u64 {
         assert!(byte < 8);
@@ -281,10 +281,10 @@ fn test_hash_no_bytes_dropped_64() {
 fn test_hash_no_bytes_dropped_32() {
     let val = 0xdeadbeef_u32;
 
-    assert!(hash(&val) != hash(&zero_byte(val, 0)));
-    assert!(hash(&val) != hash(&zero_byte(val, 1)));
-    assert!(hash(&val) != hash(&zero_byte(val, 2)));
-    assert!(hash(&val) != hash(&zero_byte(val, 3)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 0)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 1)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 2)));
+    assert_ne!(hash(&val), hash(&zero_byte(val, 3)));
 
     fn zero_byte(val: u32, byte: usize) -> u32 {
         assert!(byte < 4);
@@ -299,14 +299,17 @@ fn test_hash_no_concat_alias() {
     let u = ("a", "abb");
 
     assert!(s != t && t != u);
-    assert!(hash(&s) != hash(&t) && hash(&s) != hash(&u));
+    assert_ne!(s, t);
+    assert_ne!(t, u);
+    assert_ne!(hash(&s), hash(&t));
+    assert_ne!(hash(&s), hash(&u));
 
     let u = [1, 0, 0, 0];
     let v = (&u[..1], &u[1..3], &u[3..]);
     let w = (&u[..], &u[4..4], &u[4..4]);
 
-    assert!(v != w);
-    assert!(hash(&v) != hash(&w));
+    assert_ne!(v, w);
+    assert_ne!(hash(&v), hash(&w));
 }
 
 #[test]