phases: fix verify with secret csets

Verify uses repo.cancopy() to detect whether a repo is a plain old
local repo, so it was giving a confusing error message when secret
changesets were present.

mercurial/hg.py

@@ -289,7 +289,7 b' def clone(ui, peeropts, source, dest=Non'
             dircleanup = DirCleanup(dest)
 
         copy = False
-        if srcrepo.cancopy() and islocal(dest):
+        if srcrepo.cancopy() and islocal(dest) and not srcrepo.revs("secret()"):
             copy = not pull and not rev
 
         if copy:

mercurial/localrepo.py

@@ -637,10 +637,6 b' class localrepository(repo.repository):'
     def local(self):
         return self
 
-    def cancopy(self):
-        return (repo.repository.cancopy(self)
-                and not self._phaseroots[phases.secret])
-
     def join(self, f):
         return os.path.join(self.path, f)