A-lintE-mediumL-correctnessgood first issue
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Implementing Copy for iterators makes footguns, and the standard library settled not to do so for now.
let mut it = /* a Copy + Iterator */;
for x in it { if cond { break; } } // `it` copied here (forgot to `&mut it`)
let x = it.next(); // `it` is in the initial state
Clippy should have a lint that warns if "use of the original iterator after copied" is detected.