/// <summary>
/// Executes an already analysed script.
/// </summary>
/// <param name="s">The string to execute.</param>
/// <returns>A result that may be pending...</returns>
public Result Execute( Expr e )
{
if( _currentResult != null ) throw new InvalidOperationException();
_currentResult = StartExecution();
_currentResult.UpdateStatus( _visitor.VisitExpr( e ) );
return _currentResult;
}
