--- a/mercurial/revset.py	Thu Mar 19 16:06:24 2020 +0100
+++ b/mercurial/revset.py	Sat Mar 21 13:27:47 2020 +0900
@@ -2108,7 +2108,8 @@
     except (TypeError, ValueError):
         # i18n: "rev" is a keyword
         raise error.ParseError(_(b"rev expects a number"))
-    repo.changelog.node(l)  # check that the rev exists
+    if l not in _virtualrevs:
+        repo.changelog.node(l)  # check that the rev exists
     return subset & baseset([l])