[tor-bugs] #24761 [Core Tor/Tor]: rust: protover.rs needs retain_hash_collection to build with older rustc versions

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#24761: rust: protover.rs needs retain_hash_collection to build with older rustc
versions
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 Reporter:  teor                |          Owner:  teor
     Type:  defect              |         Status:  needs_review
 Priority:  Medium              |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor        |        Version:  Tor: 0.3.2.1-alpha
 Severity:  Normal              |     Resolution:
 Keywords:  rust, 032-backport  |  Actual Points:  0.1
Parent ID:                      |         Points:  0.1
 Reviewer:                      |        Sponsor:
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Comment (by Sebastian):

 This is a bad idea. Features mean you cannot compile on anything but
 nightly. Did we move away from our 1.14 stable policy? If not then there
 really should be CI for this preventing the merge of such changes. If we
 moved away from it, what is the current policy?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24761#comment:2>
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