Found by @MaloJaffre: The following code causes UB (not observable through crashes, but still):
use std::collections::VecDeque;
fn main() {
println!("{:?}", VecDeque::<u32>::new().iter());
}
This will create a VecDeque ring with capacity 8, then turn that into a slice for Iter, and then print that entire slice. Run it in Miri to see for yourself (Miri is in the "tools" menu).
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