# HG changeset patch
# User Boris Feld <boris.feld@octobus.net>
# Date 2018-10-18 22:53:18
# Node ID c7618901584db5c477199c95793b7d5b8edd5dbc
# Parent  4fe63b573791e198b9243046aac1bf9816aacb6f

obsutil: prefetch method in allpredecessors loop

We don't expect a massive speedup from this, but the change was laying around
in my repository and it cannot hurt.

diff --git a/mercurial/obsutil.py b/mercurial/obsutil.py
--- a/mercurial/obsutil.py
+++ b/mercurial/obsutil.py
@@ -148,10 +148,11 @@ def allpredecessors(obsstore, nodes, ign
 
     remaining = set(nodes)
     seen = set(remaining)
+    prec = obsstore.predecessors.get
     while remaining:
         current = remaining.pop()
         yield current
-        for mark in obsstore.predecessors.get(current, ()):
+        for mark in prec(current, ()):
             # ignore marker flagged with specified flag
             if mark[2] & ignoreflags:
                 continue