pycompat: export queue module instead of symbols in module (API) Previously, pycompat and util re-exported individual symbols from the queue module. This had the side-effect of forcing the loading of the queue module whenever pycompat/util was imported. These symbols aren't used very often. So importing the module to get a handle on the symbols is wasteful. This commit changes pycompat so it no longer exports the individual symbols in the queue module. Instead, we make the imported module a "public" symbol. We drop the individual symbol aliases from the util module. All consumers are updated to use pycompat.queue.* instead. This change makes 300 invocations of `hg log -r. -T '{rev}\n'` a little faster: before: 18.44s after: 17.87s Differential Revision: https://phab.mercurial-scm.org/D3441

--- a/mercurial/pycompat.py	Sat May 05 18:41:51 2018 -0700
+++ b/mercurial/pycompat.py	Sat May 05 18:35:16 2018 -0700
@@ -23,7 +23,7 @@
     import cookielib
     import cPickle as pickle
     import httplib
-    import Queue as _queue
+    import Queue as queue
     import SocketServer as socketserver
     import xmlrpclib
 
@@ -36,16 +36,13 @@
     import http.cookiejar as cookielib
     import http.client as httplib
     import pickle
-    import queue as _queue
+    import queue as queue
     import socketserver
     import xmlrpc.client as xmlrpclib
 
     def future_set_exception_info(f, exc_info):
         f.set_exception(exc_info[0])
 
-empty = _queue.Empty
-queue = _queue.Queue
-
 def identity(a):
     return a