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throwerror int_expr
throwerror ( int_expr )

Cause a runtime error to occour. These errors may be trapped with the Onerror statement.

onerror errortrap
print "before error"
throwerror 99
print "after error"
end

subroutine errortrap()
print "error " + lasterror + " happened"
end subroutine

will display

before error
error 99 happened
after error