rust: add comment about lack of wdirrev handling
If hg is compiled with rust support, 'only(wdir())' crashed as
"rustext.GraphError: ('ParentOutOfRange',
2147483647)", which should instead
say "abort: working directory revision cannot be specified."
--- a/mercurial/revlog.py Sun Jan 20 11:51:21 2019 +0900
+++ b/mercurial/revlog.py Sun Jan 20 11:57:36 2019 +0900
@@ -896,6 +896,8 @@
common = [nullrev]
if rustext is not None:
+ # TODO: WdirUnsupported should be raised instead of GraphError
+ # if common includes wdirrev
return rustext.ancestor.MissingAncestors(self.index, common)
return ancestor.incrementalmissingancestors(self.parentrevs, common)