You will never actually encounter code like this in practical use. And even if not, this example isn’t particularly hard to decompose and understand once you h

You will never actually encounter code like this in practical use. And even if not, this example isn’t particularly hard to decompose and understand once you have a basic grasp of the independent underlying bits (generics, lifetimes, borrows). It’s just combining all of them pathologically into an extremely terse minimal reproduction. It’s like saying you could never understand Java because someone linked to an AbstractClientProxyFactoryFactoryFactoryBean.