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struct Foo; impl Drop for Foo { fn drop(&mut self) { println!("drop"); } } fn main() { let _ = Foo; println!("After"); } http://is.gd/SQ6vcn 输出是 drop After 而如果我们换成: struct Foo; impl Drop for Foo { fn drop(&mut self) { println!("drop"); } } fn main() { let x = Foo; let _ = x; println!("After"); } http://is.gd/uvJMO0 After drop
我们明明可以显式地给返回值调用一个 drop!
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