Questions

Questions:
1. Return ASome() or AMaybe(), when widened with ANil

val a = Interval(IntegerVal(-1),IntegerVal(5))
val b = Interval(IntegerVal(3),IntegerVal(8))
val c = ACons(a, ANil)

widen_Mixed(c, b)
→ widen with head of ACons (AInt), tail of ACons(ANil) and c (Interval)
→ ASome(Interval[-1,8]) union ANone → AMaybe(Interval[-1,8])

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2. Recheck logic of methods

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3. widen – Operator
=> widen Interval of ALists => returns AInt
=> widen AList: Pattern Matching => returns AList (necessary?)

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4. cases AMany
e.g. isConcreteElementOf_List
→ \gamma(AMany(ax)) = \gamma(ANil) \union \gamma(ACons(ax, AMany(ax)))

Instead of one case splittet in two cases
case (Nil, AMany())
case (x::xs, AMany())
(avoid union-operator)

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Next Steps:
1. union and intersect operators
2. Start with conditions of a lattice

• bottom
• top
• lowest upper bound
• greatest lower bound
• <=
• widen (already started with implementation)