on_drop 0.1.2

on drop
Documentation 
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use on_drop::OnDrop;

#[test]
fn test(){
    let (drop_item,drop_token) =OnDrop::token(1);
    assert_eq!(drop_token.is_droped(), false);
    drop(drop_item);
    assert_eq!(drop_token.is_droped(), true);
}