{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"DynCompatibilityViolation::SizedSelf(_)"}]}
            DynCompatibilityViolation::SizedSelf(_) => "it requires `Self: Sized`".into(),
        match self {
            DynCompatibilityViolation::SupertraitSelf(spans) => {