Method start

crates/ffi/src/kernel.rs:2810–2819

Begin the progress indicator for a new constant. Quiet mode writes `{prefix} ...` as an ephemeral label; verbose mode writes it as the start of a line that will be completed by `finish`.

(&mut self, prefix: &str)

    format!(
      "  [{}/{}] {}",
      self.progress_index + 1,
      self.progress_total,
      self.display
    )
  }

  fn err_msg(&self) -> &str {
    match &self.result {
      Ok(()) => "",
      Err((_kind, msg)) => msg,
    }
  }