unused imports

src/rustbook/build.rs

@@ -10,7 +10,6 @@
 
 //! Implementation of the `build` subcommand, used to compile a book.
 
-use std::os;
 use std::env;
 use std::old_io;
 use std::old_io::{fs, File, BufferedWriter, TempDir, IoResult};

src/rustbook/test.rs

@@ -17,7 +17,6 @@ use error::Error;
 use term::Term;
 use book;
 use std::old_io::{Command, File};
-use std::os;
 use std::env;
 
 struct Test;