--- a/Lib/email/utils.py	Fri May 04 23:17:03 2012 +0200
+++ b/Lib/email/utils.py	Sat May 05 12:41:33 2012 -0400
@@ -57,6 +57,10 @@
 specialsre = re.compile(r'[][\\()<>@,:;".]')
 escapesre = re.compile(r'[\\"]')
 
+# How to figure out if we are processing strings that come from a byte
+# source with undecodable characters.
+_has_surrogates = re.compile(
+    '([^\ud800-\udbff]|\A)[\udc00-\udfff]([^\udc00-\udfff]|\Z)').search
 
 
 # Helpers