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Return error status.
 
ERR and ERL
 
Usage Notes
    ■ After an error, the function ERR returns the latest setting of the
      runtime error code, and the ERL function returns the line number
      where the error occurred. Because ERR and ERL return meaningful
      values only after an error, they are usually used in error-handling
      routines to determine the error and the corrective action.
    ■ The value returned by the ERR function can be directly set by
      using the ERR statement. Both the values returned by ERR and ERL may
      be set indirectly with the ERROR statement.
    ■ The ERL function returns only the line number, not line labels,
      located before the line producing the error. If your program has no
      line numbers, or there is no line number in the program before the
      point where the error occurred, ERL returns 0.
    ■ ERL values differ between programs compiled with BC and those run
      under QBX. In programs compiled with BC, ERL is set to the last
      numbered line in the source file preceding the line where the error
      occurred. When QBX detects an error in a procedure, it looks for a
      line number only within the immediate procedure. If the procedure
      doesn't contain a numbered line, QBX returns 0 for ERL. You can make
      your programs run identically with both BC and QBX by always
      including a line number at the beginning of a procedure where an
      error might occur.