# HG changeset patch
# User Augie Fackler <augie@google.com>
# Date 1524806842 14400
# Node ID 73ca1c5e65f8f2899f973a8185f25ca30e8d5806
# Parent  dd071b34e60b4e560821109e36253be23e65b2ee
convcmd: make a copy of heads before mutating it

Differential Revision: https://phab.mercurial-scm.org/D3486

diff -r dd071b34e60b -r 73ca1c5e65f8 hgext/convert/convcmd.py
--- a/hgext/convert/convcmd.py	Fri Apr 27 01:26:23 2018 -0400
+++ b/hgext/convert/convcmd.py	Fri Apr 27 01:27:22 2018 -0400
@@ -234,7 +234,7 @@
     def walktree(self, heads):
         '''Return a mapping that identifies the uncommitted parents of every
         uncommitted changeset.'''
-        visit = heads
+        visit = list(heads)
         known = set()
         parents = {}
         numcommits = self.source.numcommits()