What does this output? struct Print(u32); impl Drop for Print { fn drop(&mut self) { println!("{}", self.0); } } fn main() { let t = (Print(31), Print(32)); let (ref x, ref y) = (Print(21), Print(22)); let (x, y) = (Print(11), Print(12)); }
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Nope. Or at least, we have tests to check it and it is intentional.
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Esp since field re-ordering is a thing
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Doesn’t ultimately have anything to do with drop order.
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It wasn’t designed but we spec’d it to be what we happened to be doing because we didn’t feel we could change it
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There was an RFC that stabilized it: https://github.com/rust-lang/rfcs/blob/master/text/1857-stabilize-drop-order.md …
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