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/contrib/check-code.py	Sat May 05 18:41:51 2018 -0700
+++ b/contrib/check-code.py	Sat May 05 18:35:16 2018 -0700
@@ -340,7 +340,8 @@
     (r'\butil\.Abort\b', "directly use error.Abort"),
     (r'^@(\w*\.)?cachefunc', "module-level @cachefunc is risky, please avoid"),
     (r'^import atexit', "don't use atexit, use ui.atexit"),
-    (r'^import Queue', "don't use Queue, use util.queue + util.empty"),
+    (r'^import Queue', "don't use Queue, use pycompat.queue.Queue + "
+                       "pycompat.queue.Empty"),
     (r'^import cStringIO', "don't use cStringIO.StringIO, use util.stringio"),
     (r'^import urllib', "don't use urllib, use util.urlreq/util.urlerr"),
     (r'^import SocketServer', "don't use SockerServer, use util.socketserver"),