Minor unused imports etc.

src/libstd/path.rs

@@ -143,7 +143,6 @@ mod platform {
     use super::Prefix;
     use core::prelude::*;
     use ffi::OsStr;
-    use std::marker::PhantomData;
 
     #[inline]
     pub fn is_sep_byte(b: u8) -> bool {

src/libstd/thread.rs

@@ -153,7 +153,7 @@ use any::Any;
 use cell::UnsafeCell;
 use fmt;
 use io;
-use marker::{PhantomData, Send, Sync};
+use marker::PhantomData;
 use old_io::stdio;
 use rt::{self, unwind};
 use sync::{Mutex, Condvar, Arc};

src/libterm/lib.rs

@@ -50,7 +50,6 @@
        html_playground_url = "http://play.rust-lang.org/")]
 #![deny(missing_docs)]
 
-#![feature(core)]
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(int_uint)]