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Proof step 2 from proof contains-length (previous step)

contains(str, ty, fs), fs ' = _length, is_arraytype(ty) ⊦ type∃(str, ty)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ contains(str, ty, fs) ↔ 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))

Rule argument

[crewrite-arg: contains-field-def, F, [fs, ty, str] → [fs, ty, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (fs, ty, str)]]