syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// lifetimes erased. This can be used to represent types in positions where
context_before:     /// A higher-ranked type used to represent a type which has had some of its
context_after:     /// a lifetime is literally inexpressible, such as self-referential types.