How to check for and trap a CAS error in a program?

[BruceH]

I have the following sample program in the emulator, latest ROM.[/quote]

PHP Code:

EXPORT FOO()
BEGIN
  LOCAL i, p;
  PRINT();
  i := 0;
  IFERR
    WHILE i < 3 DO
      p := CAS.part("sin(45)", i);
      PRINT(p);
      i := i + 1;
    END;
  THEN
    PRINT("Error at part "+i);
  ELSE
    PRINT("No error");
  END;
  RETURN 1;
END; 


When I run it I get the following on the terminal:

Quote:sin
45
part(sin(45),i_,i_)
Error: Bad Argument Value
No error

As you can see from the messages, the IFERR error handler didn't trap the CAS error. Is there another 'official' way to do this?