Fix build breakage

src/compiletest/errors.rs

 import common::config;
+import io::ReaderUtil;
 
 export load_errors;
 export expected_error;

src/compiletest/header.rs

@@ -2,6 +2,7 @@
 import str;
 
 import common::config;
+import io::ReaderUtil;
 
 export test_props;
 export load_props;

src/compiletest/procsrv.rs

 import run::spawn_process;
-import io::WriterUtil;
+import io::{ReaderUtil, WriterUtil};
 import libc::{c_int, pid_t};
-
 import pipes::chan;
 
 export run;

src/test/bench/core-std.rs

@@ -6,7 +6,7 @@
 import std::map;
 import std::map::{map, hashmap};
 
-import io::Reader;
+import io::{Reader, ReaderUtil};
 
 fn main(argv: ~[~str]) {
     #macro[

src/test/bench/shootout-k-nucleotide-pipes.rs

@@ -6,7 +6,7 @@
 import std::map;
 import std::map::hashmap;
 import std::sort;
-
+import io::ReaderUtil;
 import pipes::{stream, port, chan};
 
 // given a map, print a sorted version of it

src/test/bench/shootout-k-nucleotide.rs

@@ -6,6 +6,7 @@
 import std::map;
 import std::map::hashmap;
 import std::sort;
+import io::ReaderUtil;
 
 // given a map, print a sorted version of it
 fn sort_and_fmt(mm: hashmap<~[u8], uint>, total: uint) -> ~str { 

src/test/bench/sudoku.rs

 use std;
 
 import std::bitv;
-import io::WriterUtil;
+import io::{ReaderUtil, WriterUtil};
 
 // Computes a single solution to a given 9x9 sudoku
 //