struct’s lifetime requirements can be bypassed via covariant field assignment · Issue #164250 · rust-lang/rust

In the following code: use std::sync::Mutex; static KEPT: Mutex<Vec<Box<dyn std::any::Any + Send>>> = Mutex::new(Vec::new()); struct Q<T: ’static + Send>(Option<T>); impl<T: ’static + Send> Drop fo…