test-histedit-edit: add test that demonstrates bug in issue4704
Durham and I agree that it's a bug you can fold into a change that's
not listed in the histedited set, so we'll follow this up with a
change that prevents folds as the first edit step.
#!/usr/bin/env python
import errno, os, sys
for f in sys.argv[1:]:
try:
print f, '->', os.readlink(f)
except OSError, err:
if err.errno != errno.EINVAL:
raise
print f, 'not a symlink'
sys.exit(0)