# docs(review): note why a pump Send racing program exit is safe

`c78a8c5`→[main](/content/gh/entireio/cli/commits/main/index.html)·

peyton-alt·1w ago·1 file·+4 added/-1 removed

Review asked whether the pump can Send after the Bubble Tea program
exits (select picking a queued msg after done closes). It can — and
it's a no-op by construction: tea.Program.Send is a context-guarded
select and the msgs channel is never closed, so a post-exit Send
returns immediately rather than panicking or blocking. Recorded at the
pump so the next reader doesn't re-derive it from the tea source.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

## Sessions

01KX0Z9J512Y4QA9MHEGY042RTView transcript

## Changes

1

- cmd/entire/cli/review

- Mtui_sink.go+4/-1

```
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151 unmodified lines

// Pump: the only goroutine allowed to block on Program.Send. When the
	// program exits (done closes), a blocked Send unblocks via the program's
	// context and the pump drains out.
	// context and the pump drains out. A Send that races program exit (done
	// closes while a queued msg is in hand) is equally safe: Bubble Tea's
	// Send is a context-guarded select and the msgs channel is never closed,
	// so a post-exit Send is an immediate no-op — not a panic, not a block.
	go func() {
		defer close(s.pumpDone)
		for {
```

Mcmd/entire/cli/review/tui_sink.go+4/-1