Clean up unused imports

src/libextra/fileinput.rs

@@ -420,7 +420,6 @@ mod test {
     use std::rt::io;
     use std::rt::io::Writer;
     use std::rt::io::file;
-    use std::uint;
     use std::vec;
 
     fn make_file(path : &Path, contents: &[~str]) {

src/libextra/future.rs

@@ -25,8 +25,6 @@
 
 #[allow(missing_doc)];
 
-
-use std::cast;
 use std::cell::Cell;
 use std::comm::{PortOne, oneshot};
 use std::task;

src/libextra/glob.rs

@@ -512,10 +512,8 @@ impl MatchOptions {
 
 #[cfg(test)]
 mod test {
-    use std::{io, os, unstable};
-    use std::unstable::finally::Finally;
+    use std::os;
     use super::*;
-    use tempfile;
 
     #[test]
     fn test_absolute_pattern() {