syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"extract_source(src,"}]}
source_snippet:                 extract_source(src, start_index, end_index)
context_before:             } else if let Some(src) = local_begin.sf.external_src.read().get_source() {
context_after:             } else {