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Proof step 54 from proof contains-field-def-case (previous step)

type∃(str, ty), ty0 ≤ ty, contains(str, ty0 ' + tys0), is_reftype(tys0 .last), is_classtype(tys0 .last) → ¬ interface∃(str, tys0 .last .class) ∧ fs ' ∈ instfields(tys0 .last .class), is_arraytype(tys0 .last) → fs ' = _length ⊦ tys0 = [], tys0 .last ≤ ty ∧ type∃(str, tys0 .last), ∃ tys. contains(str, ty ' + tys + tys0 .last ')

User applied rule exists right

And obtained the following new goals

Proof step 53:
type∃(str, ty), ty0 ≤ ty, contains(str, ty0 ' + tys0), is_reftype(tys0 .last), is_classtype(tys0 .last) → ¬ interface∃(str, tys0 .last .class) ∧ fs ' ∈ instfields(tys0 .last .class), is_arraytype(tys0 .last) → fs ' = _length ⊦ tys0 = [], tys0 .last ≤ ty ∧ type∃(str, tys0 .last), contains(str, ty ' + tys0 .butlast + tys0 .last ')

Rule argument

[EXRARG : pos: right 3, [extquanttermlist: (tys0 .butlast) abort:F , discard:T , computed:F ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (tys0 .butlast)]]