clean-up unused import warnings

src/libextra/arc.rs

@@ -46,7 +46,6 @@
 
 use core::cast;
 use core::unstable::sync::UnsafeAtomicRcBox;
-use core::ptr;
 use core::task;
 use core::borrow;
 

src/libextra/rope.rs

@@ -38,7 +38,6 @@
 use core::prelude::*;
 
 use core::iterator::IteratorUtil;
-use core::str;
 use core::uint;
 use core::vec;
 

src/librustc/middle/astencode.rs

@@ -26,7 +26,6 @@
 use util::ppaux::ty_to_str;
 
 use core::at_vec;
-use core::str;
 use core::uint;
 use extra::ebml::reader;
 use extra::ebml;

src/librustc/middle/borrowck/mod.rs

@@ -25,7 +25,6 @@
 use core::io;
 use core::ops::{BitOr, BitAnd};
 use core::result::{Result};
-use core::str;
 use syntax::ast;
 use syntax::ast_map;
 use syntax::visit;

src/librustc/middle/dataflow.rs

@@ -21,7 +21,6 @@
 use core::iterator::IteratorUtil;
 use core::cast;
 use core::io;
-use core::str;
 use core::uint;
 use core::vec;
 use syntax::ast;

src/librustc/middle/freevars.rs

@@ -17,7 +17,6 @@
 use middle::ty;
 
 use core::hashmap::HashMap;
-use core::vec;
 use syntax::codemap::span;
 use syntax::{ast, ast_util, visit};
 

src/librustc/middle/trans/common.rs

@@ -44,7 +44,6 @@
 use core::hash;
 use core::hashmap::{HashMap, HashSet};
 use core::libc::{c_uint, c_longlong, c_ulonglong};
-use core::ptr;
 use core::str;
 use core::to_bytes;
 use core::vec::raw::to_ptr;

src/libstd/str.rs

@@ -32,7 +32,6 @@
 use old_iter::{BaseIter, EqIter};
 use ptr;
 use ptr::RawPtr;
-use str;
 use to_str::ToStr;
 use uint;
 use vec;

src/libsyntax/parse/lexer.rs

@@ -22,7 +22,6 @@
 use core::iterator::IteratorUtil;
 use core::char;
 use core::either;
-use core::str;
 use core::u64;
 
 pub use ext::tt::transcribe::{TtReader, new_tt_reader};
@@ -548,7 +547,7 @@ fn ident_continue(c: char) -> bool {
 // EFFECT: advances the input past that token
 // EFFECT: updates the interner
 fn next_token_inner(rdr: @mut StringReader) -> token::Token {
-    let mut c = rdr.curr;
+    let c = rdr.curr;
     if ident_start(c) {
         let start = rdr.last_pos;
         while ident_continue(rdr.curr) {

src/libsyntax/print/pprust.rs

@@ -34,7 +34,6 @@
 use core::str;
 use core::u64;
 use core::uint;
-use core::vec;
 
 // The @ps is stored here to prevent recursive type.
 pub enum ann_node<'self> {