syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"hygiene_data:"}]}
source_snippet:             hygiene_data: Lock::new(hygiene::HygieneData::new(edition)),
context_before:             metavar_spans: Default::default(),
context_after:             source_map: sm_inputs.map(|inputs| Arc::new(SourceMap::with_inputs(inputs))),