merge: directly get destination from destutil
There is no real value in using the revset over the function.
The revset have no remaining users and will be taken care of in a later
changesets.
--- a/mercurial/commands.py Thu Oct 15 01:11:00 2015 +0100
+++ b/mercurial/commands.py Thu Oct 15 01:19:32 2015 +0100
@@ -4901,7 +4901,7 @@
node = scmutil.revsingle(repo, node).node()
if not node:
- node = scmutil.revsingle(repo, '_mergedefaultdest()').node()
+ node = repo[destutil.destmerge(repo)].node()
if opts.get('preview'):
# find nodes that are ancestors of p2 but not of p1