remove some compiler warnings

4 files changed, 6 insertions, 8 deletions

diff --git a/src/libstd/ffi/c_str.rs b/src/libstd/ffi/c_str.rs
index 69bcc82f682..c94edb9d2a1 100644
--- a/src/libstd/ffi/c_str.rs
+++ b/src/libstd/ffi/c_str.rs
@@ -422,15 +422,14 @@ mod tests {
     use prelude::v1::*;
     use super::*;
     use libc;
-    use mem;
 
     #[test]
     fn c_to_rust() {
         let data = b"123\0";
         let ptr = data.as_ptr() as *const libc::c_char;
         unsafe {
-            assert_eq!(c_str_to_bytes(&ptr), b"123");
-            assert_eq!(c_str_to_bytes_with_nul(&ptr), b"123\0");
+            assert_eq!(CStr::from_ptr(ptr).to_bytes(), b"123");
+            assert_eq!(CStr::from_ptr(ptr).to_bytes_with_nul(), b"123\0");
         }
     }
 
diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 3b4e15953c4..cf4eb09c19b 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -970,7 +970,7 @@ mod tests {
         struct R;
 
         impl Read for R {
-            fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+            fn read(&mut self, _: &mut [u8]) -> io::Result<usize> {
                 Err(io::Error::new(io::ErrorKind::Other, "", None))
             }
         }
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index b5bdeb7f181..de02b6af642 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -124,7 +124,7 @@
 #![feature(macro_reexport)]
 #![feature(hash)]
 #![feature(unique)]
-#![cfg_attr(test, feature(test, rustc_private, env))]
+#![cfg_attr(test, feature(test, rustc_private))]
 
 // Don't link to std. We are std.
 #![feature(no_std)]
diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index c24b08deec2..3ed7daf4a0a 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -761,14 +761,13 @@ mod tests {
     #[cfg(not(target_os="android"))]
     #[test]
     fn test_inherit_env() {
-        use os;
+        use std::env;
         if running_on_valgrind() { return; }
 
         let result = env_cmd().output().unwrap();
         let output = String::from_utf8(result.stdout).unwrap();
 
-        let r = os::env();
-        for &(ref k, ref v) in &r {
+        for (ref k, ref v) in env::vars() {
             // don't check windows magical empty-named variables
             assert!(k.is_empty() ||
                     output.contains(format!("{}={}", *k, *v).as_slice()),