mercurial/revset.py

--- a/mercurial/revset.py	Sat Aug 25 15:33:15 2018 +0900
+++ b/mercurial/revset.py	Sat Aug 25 20:16:28 2018 +0900
@@ -454,6 +454,8 @@
         kind, pattern, matcher = stringutil.stringmatcher(bm)
         bms = set()
         if kind == 'literal':
+            if bm == pattern:
+                pattern = repo._bookmarks.expandname(pattern)
             bmrev = repo._bookmarks.get(pattern, None)
             if not bmrev:
                 raise error.RepoLookupError(_("bookmark '%s' does not exist")