The Exception Indexing Function
The exception indexing function is used to create an array or a table for which unassigned access is illegal. Any object can be stored in an array or a table that uses the exception indexing function, but indexing into the array or table with an index for which no entry exists raises an exception.
Note: The command array has been superseded by Array.
T ≔ table⁡'exception',a=1,b=2
Error, (in `index/exception`) unassigned table entry [c]
Error, (in `index/exception`) unassigned table entry [a, b]
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