{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
    let _ = ancestors.next().filter(|it| ast::PathSegment::can_cast(it.kind()))?; // skip self
    let _ = ancestors.next()?; // skip self
    ancestors.take_while(|it| ast::Path::can_cast(it.kind())).last().and_then(ast::Path::cast)