#include <cppscript> 

var compute() 
{ 
    throw exception("compute_failure", "Not implemented");
}

var script_main(var) 
{ 
    try 
    { 
        compute(); 
    } 
    catch(var ex) 
    { 
        if( ex.class_name() == "compute_failure" )
            writeln("The computation failed because " + ex["text"]);
        else 
            throw;    // Re-throws the exception - caught in main()
    }
    return 0;
}