syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Maps the `local_hash` of an `ExpnData` to the next disambiguator value.
context_before:     syntax_context_map: FxHashMap<SyntaxContextKey, SyntaxContext>,
context_after:     /// This is used by `update_disambiguator` to keep track of which `ExpnData`s