Error functions

These functions can be used to obtain information on errors.

EASIError()
EASIError() is used to raise an error in the same manner as those raised internally by intrinsics and statements.
F$ERRNUM()
F$ERRNUM() is used to return the number of the last EASI error that occurred.
GetLastErrorMessage()
GetLastErrorMessage() is used to retrieve the text message of the last EASI error that occurred.
GetLastErrorNumber()
GetLastErrorNumber() is used to retrieve the number of the last EASI error that occurred.
ReCastEASIError()
ReCastEASIError() is used to re-cast (resend) the previous error.

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