fileset: add hint for list error to use or

mercurial/fileset.py

@@ -128,7 +128,8 b' def minusset(mctx, x, y):'
     return [f for f in xl if f not in yl]
 
 def listset(mctx, a, b):
-    raise error.ParseError(_("can't use a list in this context"))
+    raise error.ParseError(_("can't use a list in this context"),
+                           hint=_('see hg help "filesets.x or y"'))
 
 # symbols are callable like:
 #  fun(mctx, x)

tests/test-fileset.t

@@ -135,6 +135,10 b' Test files properties'
   $ fileset 'size("bar")'
   hg: parse error: couldn't parse size: bar
   [255]
+  $ fileset '(1k, 2k)'
+  hg: parse error: can't use a list in this context
+  (see hg help "filesets.x or y")
+  [255]
   $ fileset 'size(1k)'
   1k
   $ fileset '(1k or 2k) and size("< 2k")'