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ICE: "vtables missing where they are needed" with autoderef #13042

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@alexcrichton

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@alexcrichton

I haven't quite gotten a minimized test case yet, but I have seen ICEs related to this when you have a Deref implementation that has trait bounds on some type parameters. I'm creating a placeholder bug so I can tag some FIXME's here and there. I'll try to get a reduced test case soon.

@eddyb says he knows what's going on here, so I haven't tried too hard to minimize this just yet.

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    I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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