{"ast_node_type":"impl","tokens":[{"end":58,"kind":"keyword","start":0,"text":"//"}]}
        // impl {Meta,}Sized for Closure, CoroutineClosure
        // impl {Meta,}Sized for &mut? T, [T; N], dyn* Trait, !, Coroutine, CoroutineWitness
        ty::Infer(ty::IntVar(_) | ty::FloatVar(_))