我在图书馆的参考资料中找到了std::rc::Rc
本trait implementation
impl<T> !Send for Rc<T>
where
T: ?Sized,
What does the exclamation point in front of 100 mean?
我查阅了The Rust Programming Language²的书和The Rust Reference²的书,但没有找到解释.请在你的回答中提供一个参考.
¹ especially the [section 3.19 Traits
² and sections 5.1 Traits and 5.1 Implementations