syntax_data: {"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":".map(|s|"}]}
source_snippet:                 .map(|s| s.to_owned())
context_before:                 .and_then(|p| p.parent()) // chop off `lib`
context_after:                 .ok_or_else(|| {