syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"vacant.insert(ExternEntry::new(ExternLocation::FoundInLibrarySearchDirectories))"}]}
source_snippet:                     vacant.insert(ExternEntry::new(ExternLocation::FoundInLibrarySearchDirectories))
context_before:                 Entry::Vacant(vacant) => {
context_after:                 }