ON ERROR GOTO raises extype10001.

ERROR is not a reserved word of Full BASIC.
Therefore ERROR is recognized as a numeric variable,
and then ON ERROR GOTO is translated as a Minimal BASIC compatible statement
ON numeric-expression GOTO line-number, line-number, ... , line-number
Thus when the value of ERROR is zero, an exception of extype10001 shall be raised.

Notice that Full BASIC uses structured exception handling such as

WHEN EXCEPTION IN
　～
USE
　～
END WHEN

or

WHEN EXCEPTION USE handler-name
　～
END WHEN

Supplement
Even if the mode is switched to Microsoft BASIC compatible, ON ERROR GOTO can not be used.

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