auto merge of #14988 : pcwalton/rust/unsafe-destructor-feature-gate, r=alexcrichton
Closes #8142. This is not the semantics we want long-term. You can continue to use `#[unsafe_destructor]`, but you'll need to add `#![feature(unsafe_destructor)]` to the crate attributes. [breaking-change] r? @alexcrichton
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