Is the order of dropping elements of array or tuple defined?

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I want to know if I can relay on the order of dropping elements of fixed-size array or tuple.

This test shows it's left-to-right but is it defined but specs?

2

Yes, it is specified: Destructors - The Rust Reference

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https://github.com/rust-lang/rfcs/blob/master/text/1857-stabilize-drop-order.md