Missed a feature flag...

src/column.rs

 use std::iter::repeat;
+use unicode::str::UnicodeStr;
 
 use ansi_term::Style;
 

src/file.rs

@@ -10,6 +10,7 @@ use std::old_path::GenericPath;
 use std::old_path::posix::Path;
 use std::ascii::AsciiExt;
 use std::os::getcwd;
+use unicode::str::UnicodeStr;
 
 use ansi_term::{ANSIString, ANSIStrings, Colour, Style};
 use ansi_term::Style::Plain;

src/main.rs

-#![feature(collections, core, exit_status, io, libc, old_fs, old_io, old_path, os, std_misc)]
+#![feature(collections, core, exit_status, io, libc, old_fs, old_io, old_path, os, std_misc, unicode)]
 #![allow(deprecated)]
 
 // Other platforms than macos don't need std_misc but you can't
@@ -12,6 +12,7 @@ extern crate locale;
 extern crate natord;
 extern crate number_prefix;
 extern crate pad;
+extern crate unicode;
 extern crate users;
 
 #[cfg(feature="git")]