libtest: remove unnecessary as_slice() calls

Author: Jorge Aparicio

src/libtest/lib.rs

@@ -471,7 +471,7 @@ pub fn opt_shard(maybestr: Option<String>) -> Option<(uint,uint)> {
     match maybestr {
         None => None,
         Some(s) => {
-            let mut it = s.as_slice().split('.');
+            let mut it = s.split('.');
             match (it.next().and_then(from_str::<uint>), it.next().and_then(from_str::<uint>),
                    it.next()) {
                 (Some(a), Some(b), None) => {
@@ -934,8 +934,8 @@ fn should_sort_failures_before_printing_them() {
         Pretty(_) => unreachable!()
     };
 
-    let apos = s.as_slice().find_str("a").unwrap();
-    let bpos = s.as_slice().find_str("b").unwrap();
+    let apos = s.find_str("a").unwrap();
+    let bpos = s.find_str("b").unwrap();
     assert!(apos < bpos);
 }
 

src/libtest/stats.rs

@@ -250,7 +250,7 @@ impl<T: FloatMath + FromPrimitive> Stats<T> for [T] {
         // This constant is derived by smarter statistics brains than me, but it is
         // consistent with how R and other packages treat the MAD.
         let number = FromPrimitive::from_f64(1.4826).unwrap();
-        abs_devs.as_slice().median() * number
+        abs_devs.median() * number
     }
 
     fn median_abs_dev_pct(&self) -> T {