diff options
| -rw-r--r-- | sphinx/environment/__init__.py | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sphinx/environment/__init__.py b/sphinx/environment/__init__.py index d5479d46f..e0110bdda 100644 --- a/sphinx/environment/__init__.py +++ b/sphinx/environment/__init__.py @@ -22,7 +22,7 @@ from os import path from docutils.frontend import OptionParser from docutils.utils import Reporter, get_source_line from six import BytesIO, itervalues, class_types, next -from six.moves import cPickle as pickle, reduce +from six.moves import cPickle as pickle from sphinx import addnodes, versioning from sphinx.deprecation import RemovedInSphinx20Warning @@ -914,7 +914,7 @@ class BuildEnvironment(object): def check_consistency(self): # type: () -> None """Do consistency checks.""" - included = reduce(lambda x, y: x | y, self.included.values(), set()) # type: Set[unicode] # NOQA + included = set().union(*self.included.values()) # type: ignore for docname in sorted(self.all_docs): if docname not in self.files_to_rebuild: if docname == self.config.master_doc: |