Ah, not exactly a backwards compatibility concern, but I wanted to raise that one other thing I think we should try to address is the "private-in-public" situation. I think we are pretty close to a plan there, actually, but there were some unknowns (primarily around what rules to use for impls, I think), and I think it's worth trying to consider said rules together with this proposal. That said, I have to go do some non-Rust related things right now... so I don't have time to do it now! Just wanted to note it down while I was thinking of it.
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