De-~[] Mem{Reader,Writer}

src/test/bench/shootout-k-nucleotide-pipes.rs

@@ -154,7 +154,7 @@ fn main() {
 
     let rdr = if os::getenv("RUST_BENCH").is_some() {
         let foo = include_bin!("shootout-k-nucleotide.data");
-        ~MemReader::new(foo.to_owned()) as ~Reader
+        ~MemReader::new(Vec::from_slice(foo)) as ~Reader
     } else {
         ~stdio::stdin() as ~Reader
     };

src/test/run-pass/ifmt.rs

@@ -174,7 +174,7 @@ fn test_write() {
         writeln!(w, "{foo}", foo="bar");
     }
 
-    let s = str::from_utf8_owned(buf.unwrap()).unwrap();
+    let s = str::from_utf8(buf.unwrap().as_slice()).unwrap().to_owned();
     t!(s, "34helloline\nbar\n");
 }
 
@@ -198,7 +198,7 @@ fn test_format_args() {
         format_args!(|args| { fmt::write(w, args); }, "test");
         format_args!(|args| { fmt::write(w, args); }, "{test}", test=3);
     }
-    let s = str::from_utf8_owned(buf.unwrap()).unwrap();
+    let s = str::from_utf8(buf.unwrap().as_slice()).unwrap().to_owned();
     t!(s, "1test3");
 
     let s = format_args!(fmt::format, "hello {}", "world");