diff -r 3ccaf995f549 -r 0a9c0d3480b2 mercurial/thirdparty/concurrent/futures/__init__.py
--- a/mercurial/thirdparty/concurrent/futures/__init__.py	Mon Apr 09 12:22:31 2018 -0700
+++ b/mercurial/thirdparty/concurrent/futures/__init__.py	Mon Apr 09 12:23:48 2018 -0700
@@ -3,21 +3,25 @@
 
 """Execute computations asynchronously using threads or processes."""
 
+from __future__ import absolute_import
+
 __author__ = 'Brian Quinlan (brian@sweetapp.com)'
 
-from concurrent.futures._base import (FIRST_COMPLETED,
-                                      FIRST_EXCEPTION,
-                                      ALL_COMPLETED,
-                                      CancelledError,
-                                      TimeoutError,
-                                      Future,
-                                      Executor,
-                                      wait,
-                                      as_completed)
-from concurrent.futures.thread import ThreadPoolExecutor
+from ._base import (
+    FIRST_COMPLETED,
+    FIRST_EXCEPTION,
+    ALL_COMPLETED,
+    CancelledError,
+    TimeoutError,
+    Future,
+    Executor,
+    wait,
+    as_completed,
+)
+from .thread import ThreadPoolExecutor
 
 try:
-    from concurrent.futures.process import ProcessPoolExecutor
+    from .process import ProcessPoolExecutor
 except ImportError:
     # some platforms don't have multiprocessing
     pass