test_is_multiple_of: call is_multiple_of from trait

is_multiple_of was just stabilized for unsigned integer types[0], so this
fails to compile on recent nightlies without this fix.

0: rust-lang/rust#137383

Author: durin42

src/lib.rs

@@ -1018,14 +1018,14 @@ macro_rules! impl_integer_for_usize {
 
             #[test]
             fn test_is_multiple_of() {
-                assert!((0 as $T).is_multiple_of(&(0 as $T)));
-                assert!((6 as $T).is_multiple_of(&(6 as $T)));
-                assert!((6 as $T).is_multiple_of(&(3 as $T)));
-                assert!((6 as $T).is_multiple_of(&(1 as $T)));
-
-                assert!(!(42 as $T).is_multiple_of(&(5 as $T)));
-                assert!(!(5 as $T).is_multiple_of(&(3 as $T)));
-                assert!(!(42 as $T).is_multiple_of(&(0 as $T)));
+                assert!(<$T as Integer>::is_multiple_of(&(0 as $T), &(0 as $T)));
+                assert!(<$T as Integer>::is_multiple_of(&(6 as $T), &(6 as $T)));
+                assert!(<$T as Integer>::is_multiple_of(&(6 as $T), &(3 as $T)));
+                assert!(<$T as Integer>::is_multiple_of(&(6 as $T), &(1 as $T)));
+
+                assert!(!<$T as Integer>::is_multiple_of(&(42 as $T), &(5 as $T)));
+                assert!(!<$T as Integer>::is_multiple_of(&(5 as $T), &(3 as $T)));
+                assert!(!<$T as Integer>::is_multiple_of(&(42 as $T), &(0 as $T)));
             }
 
             #[test]