[tor-bugs] #15518 [Core Tor/Tor]: Tor considers routers in the same IPv6 /16 to be "in the same subnet"

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#15518: Tor considers routers in the same IPv6 /16 to be "in the same subnet"
-------------------------------------------------+-------------------------
 Reporter:  isis                                 |          Owner:  neel
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ipv6, path, path-bias, tor-client    |  Actual Points:
  easy                                           |
Parent ID:  #24393                               |         Points:  1
 Reviewer:  teor                                 |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 The CI failed, please run "make check-spaces" on your code, and fix the
 errors:
 https://travis-ci.org/torproject/tor/jobs/417076922#L2919

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15518#comment:40>
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