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Proof step 8 from proof contains-length (previous step)

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))

User applied rule exists right

And obtained the following new goals

Proof step 7:
fs ' = _length, type∃(str, ty), is_arraytype(ty) ⊦ ty ' ≠ [] ∧ ty ' .first ≤ ty ∧ contains(str, ty ') ∧ is_reftype(ty ' .last) ∧ (is_classtype(ty ' .last) → ¬ interface∃(str, ty ' .last .class) ∧ _length ∈ instfields(ty ' .last .class))

Rule argument

[EXRARG : pos: right 1, [extquanttermlist: (ty ')abort:F, discard:T, computed:F]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (ty ')]]