{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"self.init_mask.is_range_initialized(range).map_err(|uninit_range|"}]}
        self.init_mask.is_range_initialized(range).map_err(|uninit_range| {
    ) -> AllocResult<&[u8]> {
            AllocError::InvalidUninitBytes(Some(BadBytesAccess {