[tor-bugs] #16792 [Tor]: Have a way to mark lines as "unreachable by unit tests"

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#16792: Have a way to mark lines as "unreachable by unit tests"
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  enhancement                          |         Status:
 Priority:  High                                 |  needs_review
Component:  Tor                                  |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.9.x-final
 Keywords:  testing, 028-triaged,                |        Version:
  TorCoreTeam201604                              |     Resolution:
Parent ID:                                       |  Actual Points:  small
 Reviewer:                                       |         Points:  small
                                                 |        Sponsor:
                                                 |  SponsorS-can
-------------------------------------------------+-------------------------
Changes (by nickm):

 * status:  accepted => needs_review
 * actualpoints:   => small


Comment:

 Actually, comments are more readable here.

 Added an `lcov_excl` branch to handle the tooling, and to mark some lines
 in crypto.c

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16792#comment:16>
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