{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":".and_then(|assoc_item|"}]}
        .and_then(|assoc_item| assoc_item.implementing_ty(db))
    let function = assoc_item
        .map(|self_type| compute_return_type_match(db, &ctx, self_type, &ret_type))