syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if lo.file.start_pos != hi.file.start_pos {
context_before:         trace!(?hi);
context_after:             return Err(SpanLinesError::DistinctSources(Box::new(DistinctSources {