{"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"let"}]}
            let scalar_int = valtree.unwrap_leaf();
        ty::Bool | ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::Char | ty::RawPtr(..) => {
            debug!("writing trivial valtree {:?} to place {:?}", scalar_int, place);