syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: ///   type. For example, `fn(u32, u32) -> u32` would mean that the closure
context_before: /// - CS represents the *closure signature*, representing as a `fn()`
context_after: ///   implements `CK<(u32, u32), Output = u32>`, where `CK` is the trait