std: silence warnings when compiling test.

src/libstd/io/native/file.rs

@@ -907,22 +907,14 @@ pub fn utime(p: &CString, atime: u64, mtime: u64) -> IoResult<()> {
 #[cfg(test)]
 mod tests {
     use io::native::file::{CFile, FileDesc};
-    use io::fs;
     use io;
     use libc;
     use os;
-    use path::Path;
-    use rand;
     use result::Ok;
     use rt::rtio::RtioFileStream;
 
-    fn tmpdir() -> Path {
-        let ret = os::tmpdir().join(format!("rust-{}", rand::random::<u32>()));
-        fs::mkdir(&ret, io::UserRWX);
-        ret
-    }
-
     #[ignore(cfg(target_os = "freebsd"))] // hmm, maybe pipes have a tiny buffer
+    #[test]
     fn test_file_desc() {
         // Run this test with some pipes so we don't have to mess around with
         // opening or closing files.
@@ -949,6 +941,7 @@ mod tests {
     }
 
     #[ignore(cfg(windows))] // apparently windows doesn't like tmpfile
+    #[test]
     fn test_cfile() {
         unsafe {
             let f = libc::tmpfile();

src/libstd/io/util.rs

@@ -220,7 +220,7 @@ mod test {
     #[test]
     fn test_null_writer() {
         let mut s = NullWriter;
-        let mut buf = ~[0, 0, 0];
+        let buf = ~[0, 0, 0];
         s.write(buf);
         s.flush();
     }
@@ -248,7 +248,7 @@ mod test {
 
         struct TestWriter;
         impl Writer for TestWriter {
-            fn write(&mut self, buf: &[u8]) {
+            fn write(&mut self, _buf: &[u8]) {
                 unsafe { writes += 1 }
             }