# control.BlockResult.number

- **Module:** control.BlockResult
- **Package:** libtmux
- **Language:** Rust
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-rs/blob/f0e37052c232636b61d095817046e6bfc8f2ca40/crates/libtmux/src/control.rs#L373
- **Page:** https://libtmux.org/en/rs/latest/reference/control-blockresult-number/

```
control.BlockResult.number(self) -> u64
```

Return the block number tmux assigned.

tmux assigns this, and correlation uses it rather than counting
commands: a command that fails early can leave a caller waiting
forever for a block tmux will never send.