libstd: remove unnecessary `to_string()` calls

5 files changed, 19 insertions, 19 deletions

diff --git a/src/libstd/io/mem.rs b/src/libstd/io/mem.rs
index c48f487c95c..078daf8feca 100644
--- a/src/libstd/io/mem.rs
+++ b/src/libstd/io/mem.rs
@@ -592,7 +592,7 @@ mod test {
         writer.write_line("testing").unwrap();
         writer.write_str("testing").unwrap();
         let mut r = BufReader::new(writer.get_ref());
-        assert_eq!(r.read_to_string().unwrap(), "testingtesting\ntesting".to_string());
+        assert_eq!(r.read_to_string().unwrap(), "testingtesting\ntesting");
     }
 
     #[test]
@@ -602,7 +602,7 @@ mod test {
         writer.write_char('\n').unwrap();
         writer.write_char('ệ').unwrap();
         let mut r = BufReader::new(writer.get_ref());
-        assert_eq!(r.read_to_string().unwrap(), "a\nệ".to_string());
+        assert_eq!(r.read_to_string().unwrap(), "a\nệ");
     }
 
     #[test]
diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 5a56636ffa4..a9e653e267a 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -2005,14 +2005,14 @@ mod tests {
     fn test_show() {
         use super::*;
 
-        assert_eq!(format!("{}", USER_READ), "0400".to_string());
-        assert_eq!(format!("{}", USER_FILE), "0644".to_string());
-        assert_eq!(format!("{}", USER_EXEC), "0755".to_string());
-        assert_eq!(format!("{}", USER_RWX),  "0700".to_string());
-        assert_eq!(format!("{}", GROUP_RWX), "0070".to_string());
-        assert_eq!(format!("{}", OTHER_RWX), "0007".to_string());
-        assert_eq!(format!("{}", ALL_PERMISSIONS), "0777".to_string());
-        assert_eq!(format!("{}", USER_READ | USER_WRITE | OTHER_WRITE), "0602".to_string());
+        assert_eq!(format!("{}", USER_READ), "0400");
+        assert_eq!(format!("{}", USER_FILE), "0644");
+        assert_eq!(format!("{}", USER_EXEC), "0755");
+        assert_eq!(format!("{}", USER_RWX),  "0700");
+        assert_eq!(format!("{}", GROUP_RWX), "0070");
+        assert_eq!(format!("{}", OTHER_RWX), "0007");
+        assert_eq!(format!("{}", ALL_PERMISSIONS), "0777");
+        assert_eq!(format!("{}", USER_READ | USER_WRITE | OTHER_WRITE), "0602");
     }
 
     fn _ensure_buffer_is_object_safe<T: Buffer>(x: &T) -> &Buffer {
diff --git a/src/libstd/io/net/ip.rs b/src/libstd/io/net/ip.rs
index 4812e911cc4..20e2753392c 100644
--- a/src/libstd/io/net/ip.rs
+++ b/src/libstd/io/net/ip.rs
@@ -640,10 +640,10 @@ mod test {
     #[test]
     fn ipv6_addr_to_string() {
         let a1 = Ipv6Addr(0, 0, 0, 0, 0, 0xffff, 0xc000, 0x280);
-        assert!(a1.to_string() == "::ffff:192.0.2.128".to_string() ||
-                a1.to_string() == "::FFFF:192.0.2.128".to_string());
+        assert!(a1.to_string() == "::ffff:192.0.2.128" ||
+                a1.to_string() == "::FFFF:192.0.2.128");
         assert_eq!(Ipv6Addr(8, 9, 10, 11, 12, 13, 14, 15).to_string(),
-                   "8:9:a:b:c:d:e:f".to_string());
+                   "8:9:a:b:c:d:e:f");
     }
 
     #[test]
diff --git a/src/libstd/io/process.rs b/src/libstd/io/process.rs
index 53c672b4302..a4ca77e92fa 100644
--- a/src/libstd/io/process.rs
+++ b/src/libstd/io/process.rs
@@ -810,7 +810,7 @@ mod tests {
     fn stdout_works() {
         let mut cmd = Command::new("echo");
         cmd.arg("foobar").stdout(CreatePipe(false, true));
-        assert_eq!(run_output(cmd), "foobar\n".to_string());
+        assert_eq!(run_output(cmd), "foobar\n");
     }
 
     #[cfg(all(unix, not(target_os="android")))]
@@ -820,7 +820,7 @@ mod tests {
         cmd.arg("-c").arg("pwd")
            .cwd(&Path::new("/"))
            .stdout(CreatePipe(false, true));
-        assert_eq!(run_output(cmd), "/\n".to_string());
+        assert_eq!(run_output(cmd), "/\n");
     }
 
     #[cfg(all(unix, not(target_os="android")))]
@@ -835,7 +835,7 @@ mod tests {
         drop(p.stdin.take());
         let out = read_all(p.stdout.as_mut().unwrap() as &mut Reader);
         assert!(p.wait().unwrap().success());
-        assert_eq!(out, "foobar\n".to_string());
+        assert_eq!(out, "foobar\n");
     }
 
     #[cfg(not(target_os="android"))]
@@ -900,7 +900,7 @@ mod tests {
         let output_str = str::from_utf8(output.as_slice()).unwrap();
 
         assert!(status.success());
-        assert_eq!(output_str.trim().to_string(), "hello".to_string());
+        assert_eq!(output_str.trim().to_string(), "hello");
         // FIXME #7224
         if !running_on_valgrind() {
             assert_eq!(error, Vec::new());
@@ -941,7 +941,7 @@ mod tests {
         let output_str = str::from_utf8(output.as_slice()).unwrap();
 
         assert!(status.success());
-        assert_eq!(output_str.trim().to_string(), "hello".to_string());
+        assert_eq!(output_str.trim().to_string(), "hello");
         // FIXME #7224
         if !running_on_valgrind() {
             assert_eq!(error, Vec::new());
diff --git a/src/libstd/io/stdio.rs b/src/libstd/io/stdio.rs
index 89d5b7a8acd..fce1ee7e9b4 100644
--- a/src/libstd/io/stdio.rs
+++ b/src/libstd/io/stdio.rs
@@ -527,7 +527,7 @@ mod tests {
             set_stdout(box w);
             println!("hello!");
         });
-        assert_eq!(r.read_to_string().unwrap(), "hello!\n".to_string());
+        assert_eq!(r.read_to_string().unwrap(), "hello!\n");
     }
 
     #[test]