In most questions here I'd like to answer "The program does not compile", but that's usually the wrong answer:
Do you know how many of those examples could not compile in the successive Rust edition?
Impossible to tell because predicting things, especially the furure is hard. But i suspect none most of them will not change as the mostly relate to core ideas in Rust.
didn't know #5 was a bug
Previous discussion: Rust puzzlers in quiz form
Also, @cramertj commented on /r/rust:
FWIW #5 is a bug that I believe the plan-of-record is to fix as part of the universes work that Niko has been doing.
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