void OnSliceExpression(Token start, Token stop, Token step)
{
System.Diagnostics.Debug.Assert(start == null || start is NumberToken);
System.Diagnostics.Debug.Assert(stop == null || stop is NumberToken);
System.Diagnostics.Debug.Assert(step == null || step is NumberToken);
var startIndex = (int?)start?.Value;
var stopIndex = (int?)stop?.Value;
var stepIndex = (int?)step?.Value;
generator_.OnSliceExpression(startIndex, stopIndex, stepIndex);
}
