--- a/mercurial/util.py Thu Apr 05 11:33:36 2018 -0700
+++ b/mercurial/util.py Thu Apr 05 10:13:01 2018 -0400
@@ -1544,6 +1544,7 @@
# a whilelist of known filesystems where hardlink works reliably
_hardlinkfswhitelist = {
+ 'apfs',
'btrfs',
'ext2',
'ext3',