{"ast_node_type":"import","tokens":[{"end":73,"kind":"keyword","start":0,"text":"///"}]}
///     - however, `LocalType<Vec<T>>` is OK, because `T` is a subtree of
///     the second occurrence of `T` is not a subtree of *any* local type.
///     `LocalType<Vec<T>>`, which is local and has no types between it and