# HG changeset patch
# User Pulkit Goyal <7895pulkit@gmail.com>
# Date 1495201326 -19800
# Node ID a28c76e1cea98c3f7ac227dbd9853844132e6165
# Parent  c8e10565a113f994271c2d0d18355340f7db5ef6
revlog: raise WdirUnsupported when wdirrev is passed

revlog.parentrevs() is called while evaluating ^ operator in revsets. When wdir
is passed, it raises IndexError. This patch raises WdirUnsupported if wdir is
passed in the function. The error will be caugth in future patches.

diff -r c8e10565a113 -r a28c76e1cea9 mercurial/revlog.py
--- a/mercurial/revlog.py	Fri May 19 19:10:37 2017 +0530
+++ b/mercurial/revlog.py	Fri May 19 19:12:06 2017 +0530
@@ -26,6 +26,7 @@
     hex,
     nullid,
     nullrev,
+    wdirrev,
 )
 from .i18n import _
 from . import (
@@ -481,7 +482,12 @@
         return self.index[rev][4]
 
     def parentrevs(self, rev):
-        return self.index[rev][5:7]
+        try:
+            return self.index[rev][5:7]
+        except IndexError:
+            if rev == wdirrev:
+                raise error.WdirUnsupported
+            raise
 
     def node(self, rev):
         return self.index[rev][7]