The ONWCHAR pseudovariable sets the current value of the ONWCHAR
built-in function. The element value assigned to the pseudovariable
is converted to a widechar value of length 1. The new widechar is
used when the conversion is attempted again. (See conversions in Data conversion.)
>>-ONWCHAR-+----+---------------------------------------------->< '-()-'
The pseudovariable must not be used out of context.