{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
        let dummy_ty = if let ty::Array(elem_ty, size) = peeled.kind()
        // Create an dummy type `&[_]` so that both &[] and `&Vec<T>` can coerce to it.
            && let ty::Infer(_) = elem_ty.kind()