syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// `Option<Box<List<T>>>` is `Send` if `Box<List<T>>` is
context_before:     /// `Option<Box<List<T>>>` is `Send`, and in turn
context_after:     /// `Send`.