directaccess: do not abort by 'ff...' hash

Since the 'ff...' hash should never be hidden, we can just ignore it.

mercurial/scmutil.py

@@ -1419,7 +1419,7 b' def _getrevsfromsymbols(repo, symbols):'
 
         try:
             s = pmatch(s)
-        except error.LookupError:
+        except (error.LookupError, error.WdirUnsupported):
             s = None
 
         if s is not None:

tests/test-directaccess.t

@@ -179,6 +179,19 b' This should not throw error'
    foo
   -bar
 
+Test special hash/rev
+
+  $ hg log -qr 'null:wdir() & 000000000000'
+  -1:000000000000
+  $ hg log -qr 'null:wdir() & ffffffffffff'
+  2147483647:ffffffffffff
+  $ hg log -qr 'null:wdir() & rev(-1)'
+  -1:000000000000
+  $ hg log -qr 'null:wdir() & rev(2147483647)'
+  2147483647:ffffffffffff
+  $ hg log -qr 'null:wdir() & 2147483647'
+  2147483647:ffffffffffff
+
 Commands with undefined cmdtype should not work right now
 
   $ hg phase -r 28ad74