syntax_data: {"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"source_map:"}]}
source_snippet:     source_map: Arc<SourceMap>,
context_before:     pub bad_unicode_identifiers: Lock<FxIndexMap<Symbol, Vec<Span>>>,
context_after:     pub buffered_lints: Lock<Vec<BufferedEarlyLint>>,