{"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"let"}]}
        let parent = name_ref.syntax().parent()?;
    fn from_name_ref(name_ref: ast::NameRef, krate: Crate) -> Option<CallInfo> {
        if let Some(call) = ast::MethodCallExpr::cast(parent.clone()) {