syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"begin:"}]}
source_snippet:                 begin: (lo.file.name.clone(), lo.file.start_pos),
context_before:             return Err(SpanLinesError::DistinctSources(Box::new(DistinctSources {
context_after:                 end: (hi.file.name.clone(), hi.file.start_pos),