syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"//!"}]}
source_snippet: //! - `TypeSuperVisitable`. This is implemented only for recursive types of
context_before: //!     It defines a "skeleton" of how they should be visited.
context_after: //!   interest, and defines the visiting "skeleton" for these types. (This