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Proof step 9 from proof contains-length (previous step)

type∃(str, ty), fs ' = _length, is_arraytype(ty) ⊦ type∃(str, ty) ∧ (∃ tys. tys ≠ [] ∧ tys .first ≤ ty ∧ contains(str, tys) ∧ is_reftype(tys .last) ∧ (is_classtype(tys .last) → ¬ interface∃(str, tys .last .class) ∧ fs ' ∈ instfields(tys .last .class)) ∧ (is_arraytype(tys .last) → fs ' = _length))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
fs ' = _length, type∃(str, ty), is_arraytype(ty) ⊦ ∃ tys. tys ≠ [] ∧ tys .first ≤ ty ∧ contains(str, tys) ∧ is_reftype(tys .last) ∧ (is_classtype(tys .last) → ¬ interface∃(str, tys .last .class) ∧ _length ∈ instfields(tys .last .class))

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]