syntax_data: {"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let files = BTreeSet::from_iter(iter::once(path));
context_before:                 Entry::Vacant(vacant) => {
context_after:                     vacant.insert(ExternEntry::new(ExternLocation::ExactPaths(files)))