{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
        let data = data.strip_suffix(MAGIC_END_BYTES).ok_or(())?;
    pub fn new(data: &'a [u8], position: usize) -> Result<MemDecoder<'a>, ()> {
        let Range { start, end } = data.as_ptr_range();