{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
        let Range { start, end } = data.as_ptr_range();
        let data = data.strip_suffix(MAGIC_END_BYTES).ok_or(())?;
        Ok(MemDecoder { start, current: data[position..].as_ptr(), end, _marker: PhantomData })