if !main {
			ignoreGoroutines[goroutineID()] = true
		}

		// Start the next goroutine now that there are no more recursions left
		// for this current goroutine.
		go recurseThenCallGo(w, frames-1, numFrames, false)
		return
	}
	recurseThenCallGo(w, frames, goroutines-1, main)
}

func goroutineID() string {
	buf := make([]byte, 128)
	runtime.Stack(buf, false)
	prefix := []byte("goroutine ")
	var found bool

		}

		if want, count := "main.recurseThenCallGo(...)", ancestorsExpected*(numFrames+1); strings.Count(output, want) != count {
			t.Errorf("output does not contain %d instances of %q:\n%s", count, want, output)
		}

		if want, count := "main.recurseThenCallGo(0x", 1; strings.Count(output, want) != count {