Inst   []Inst
	Start  int // index of start instruction
	NumCap int // number of InstCapture insts in re
}

// An InstOp is an instruction opcode.
type InstOp uint8

const (
	InstAlt InstOp = iota
	InstAltMatch
	InstCapture
	InstEmptyWidth
	InstMatch
	InstFail
	InstNop
	InstRune
	InstRune1
	InstRuneAny
	InstRuneAnyNotNL
)

var instOpNames = []string{
	"InstAlt",
	"InstAltMatch",

     *
     * This is called after the underlying Executor has been stopped.
     */
    void onStop();

    /**
     * Runs the Runnable, catches all Throwables and logs them.
     *
     * The first exception caught during onExecute(), will be rethrown in onStop().
     */
    class CatchAndRecordFailures implements ExecutorPolicy {

            }
        } catch (InterruptedException e) {
            delegate.shutdownNow();
            throw UncheckedException.throwAsUncheckedException(e);
        }
        executorPolicy.onStop();
    }

    @Override
    public void setKeepAlive(int timeout, TimeUnit timeUnit) {
        if (delegate instanceof ThreadPoolExecutor) {

            addToQueue(flushOperationsCommand);
            flushOperationsCommand.await();
        }
        rethrowFailure();
    }

    private void rethrowFailure() {
        failureHandler.onStop();
    }

    private static class FlushOperationsCommand implements Runnable {
        private CountDownLatch latch = new CountDownLatch(1);

        @Override
        public void run() {
        }