Fix some missing imports

diff --git a/Doc/lib/libcontextlib.tex b/Doc/lib/libcontextlib.tex
index 5f12af833cb9def6301c3b8eace6e28d365cbd0a..842c95492b0839a8944d8e012bb4a703e248319f 100644 (file)
--- a/Doc/lib/libcontextlib.tex
+++ b/Doc/lib/libcontextlib.tex
@@ -121,7 +121,9 @@ def closing(thing):
 
 And lets you write code like this:
 \begin{verbatim}
+from __future__ import with_statement
 from contextlib import closing
+import codecs
 
 with closing(codecs.open("foo", encoding="utf8")) as f:
     for line in f: