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Proof step 15 from proof is_obj-put-equiv (previous step)

sk .fs = mkfs(class, ty, fieldvar), r1 ∈ st, okval(val, ty), is_fskey(sk), r1 -- sk ∈ st, okval(st[r1 -- sk], ty) ⊦ class+∃(str, st[r1 -- _type] .type .class) ∧ ¬ is_abstract(st[r1 -- _type] .type .class) ∧ is_obj(r1, st[r1 -- sk, val]) ↔ is_obj(str, r1, st), ty = void_type, _type = sk

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 14:
sk = fs ', fs = mkfs(class, ty, fieldvar), r1 ∈ st, okval(val, ty), is_fskey(sk), r1 -- sk ∈ st, okval(st[r1 -- sk], ty) ⊦ class+∃(str, st[r1 -- _type] .type .class) ∧ ¬ is_abstract(st[r1 -- _type] .type .class) ∧ is_obj(r1, st[r1 -- sk, val]) ↔ is_obj(str, r1, st), ty = void_type, _type = sk

Rule argument

[speclemmaarg: ,is_fskey(sk) → (fs = sk .fs ↔ sk = fs ') ,[sk, fs] → [sk, fs] ,T ,storekey , ,elim-03 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPELIM : ⊦ is_fskey(sk) → (fs = sk .fs ↔ sk = fs ')])], [EXTRATERMS : (sk, fs)]]