syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// a lifetime is literally inexpressible, such as self-referential types.
context_before:     /// lifetimes erased. This can be used to represent types in positions where
context_after:     UnsafeBinder(UnsafeBinderInner<I>),