$ pwd
/home/storage/hg/repo/not-bundle20/756015-ipv6
$ hg bundle --rev 'bundle()' \
--base 'parents(roots(bundle()))' \
-R HG20_bundle_none HG20_bundle_none_migrated \
--type none-v2
real URL is https://code.google.com/archive/p/756015-ipv6
abort: 'https://code.google.com/archive/p/756015-ipv6' does not appear to be an hg repository:
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Google Code Archive - Long-term storage for Google Code Project Hosting.