syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"stable_id_to_source_file:"}]}
source_snippet:     stable_id_to_source_file: UnhashMap<StableSourceFileId, Arc<SourceFile>>,
context_before:     source_files: monotonic::MonotonicVec<Arc<SourceFile>>,
context_after: }