diff -up bleach-3.1.4/bleach/html5lib_shim.py.html5lib-prerel-compat bleach-3.1.4/bleach/html5lib_shim.py
--- bleach-3.1.4/bleach/html5lib_shim.py.html5lib-prerel-compat	2020-04-22 15:11:04.269007528 +0200
+++ bleach-3.1.4/bleach/html5lib_shim.py	2020-04-22 15:12:52.086153050 +0200
@@ -20,7 +20,10 @@ from html5lib.constants import (
     namespaces,
     prefixes,
 )
-from bleach._vendor.html5lib.constants import _ReparseException as ReparseException
+try:
+    from bleach._vendor.html5lib.constants import _ReparseException as ReparseException
+except ImportError:
+    from bleach._vendor.html5lib.constants import ReparseException
 from bleach._vendor.html5lib.filters.base import Filter
 from bleach._vendor.html5lib.filters.sanitizer import allowed_protocols
 from bleach._vendor.html5lib.filters.sanitizer import Filter as SanitizerFilter