--- a/hgext/evolve.py	Mon Aug 01 22:42:38 2016 +0200
+++ b/hgext/evolve.py	Mon Sep 12 10:41:00 2016 -0700
@@ -2014,7 +2014,7 @@
         repo.ui.status(_('computing new diff\n'))
         files = set()
         copied = copies.pathcopies(prec, bumped)
-        precmanifest = prec.manifest()
+        precmanifest = prec.manifest().copy()
         # 3.3.2 needs a list.
         # future 3.4 don't detect the size change during iteration
         # this is fishy