Remove unused imports

src/nice/nice.rs

@@ -16,7 +16,6 @@ extern crate libc;
 use std::ffi::CString;
 use std::io::IoError;
 use std::os;
-use std::ptr;
 use libc::{c_char, c_int, execvp};
 
 const NAME: &'static str = "nice";

src/sort/sort.rs

@@ -15,7 +15,6 @@
 extern crate getopts;
 
 use std::cmp::Ordering;
-use std::fmt::Show;
 use std::io::{print, File, BufferedReader};
 use std::io::stdio::stdin_raw;
 use std::str::Chars;

test/mv.rs

@@ -5,7 +5,6 @@ extern crate time;
 use std::io::{process, fs, FilePermission};
 use std::io::process::Command;
 use std::io::fs::PathExtensions;
-use std::io::pipe::PipeStream;
 use std::str::from_utf8;
 use std::borrow::ToOwned;