#17431: Fix missing import of BytesFeedParser in email.parser.

Initial patch contributed by Edmond Burnett.
diff --git a/Lib/email/parser.py b/Lib/email/parser.py
index 1c931ea..4e96732 100644
--- a/Lib/email/parser.py
+++ b/Lib/email/parser.py
@@ -9,7 +9,7 @@
 import warnings
 from io import StringIO, TextIOWrapper
 
-from email.feedparser import FeedParser
+from email.feedparser import FeedParser, BytesFeedParser
 from email.message import Message
 
 
diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index a1ceb7f..6fddd2b 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -38,6 +38,10 @@
 from test.support import findfile, run_unittest, unlink
 from email.test import __file__ as landmark
 
+# These imports are documented to work, but we are testing them using a
+# different path, so we import them here just to make sure they are importable.
+from email.parser import FeedParser, BytesFeedParser
+
 
 NL = '\n'
 EMPTYSTRING = ''