Function defn_const

crates/ixon/src/serialize.rs:2422–2424

(refs: Vec<Address>)

      let addr = get_address(buf)?;
      let len = Tag0::get(buf)?.size as usize;
      if buf.len() < len {
        return Err(format!(
          "Env::get_anon: need {} bytes for constant, have {}",
          len,
          buf.len()
        ));