syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":".and_then(|p|"}]}
source_snippet:                 .and_then(|p| p.parent()) // chop off `rustlib`
context_before:             dir.parent() // chop off `$target`
context_after:                 .and_then(|p| p.parent()) // chop off `lib`