Remove unnecessary to_string calls

This commit removes superfluous to_string calls from various places

2 files changed, 2 insertions, 2 deletions

diff --git a/src/test/bench/core-std.rs b/src/test/bench/core-std.rs
index 4db8cfa6565..fd3c4daebdb 100644
--- a/src/test/bench/core-std.rs
+++ b/src/test/bench/core-std.rs
@@ -24,7 +24,7 @@ use std::vec;
 use std::io::File;
 
 fn main() {
-    let argv = os::args().move_iter().map(|x| x.to_string()).collect::<Vec<String>>();
+    let argv = os::args();
     let _tests = argv.slice(1, argv.len());
 
     macro_rules! bench (
diff --git a/src/test/run-pass/issue-5666.rs b/src/test/run-pass/issue-5666.rs
index 3e6ef1d2163..222e1d54a5d 100644
--- a/src/test/run-pass/issue-5666.rs
+++ b/src/test/run-pass/issue-5666.rs
@@ -19,7 +19,7 @@ trait Barks {
 
 impl Barks for Dog {
     fn bark(&self) -> String {
-        return format!("woof! (I'm {})", self.name).to_string();
+        return format!("woof! (I'm {})", self.name);
     }
 }