syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"//!"}]}
source_snippet: //!   interest, and defines the folding "skeleton" for these types. (This
context_before: //! - `TypeSuperFoldable`. This is implemented only for recursive types of
context_after: //!   excludes `Region` because it is non-recursive, i.e. it never contains