Consider the following class dictionary:

E : S | C.
S = <v> int.
C = "(" Op <arg1> E <arg2> E ")".
Op : A | M.
A = "+".
M = "*" .

And the following compiler:



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Let's assume you have a function default
which takes as argument an object
and a field name for the object, 
and returns a value for the field.

Now insert option types
for some fields of your classes
and assume that whenever a field is needed,
the value returned by function default will be used.

How do you adapt your OptJava program
to make it work correctly with the added option types?