syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// - `A B C` and we add a cache for the result of C (DFN 2)
context_before:     ///
context_after:     /// - Then we have a stack `A B D` where `D` has DFN 3