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Proof step 20 from proof gengft (previous step)

goodfieldandtype(r, sk, st), okval(val, sk .fs .type) ⊦ goodfieldandtype(r0, sk0, st[r -- sk, val]) ↔ goodfieldandtype(r0, sk0, st), sk = _type

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 19:
sk .fs = mkfs(class, ty, fieldvar), goodfieldandtype(r, sk, st), okval(val, ty) ⊦ goodfieldandtype(r0, sk0, st[r -- sk, val]) ↔ goodfieldandtype(r0, sk0, st), sk = _type

Rule argument

[speclemmaarg: , class = fs .class ∧ ty = fs .type ∧ fieldvar = fs .field ↔ fs = mkfs(class, ty, fieldvar) ,[fs, class, ty, fieldvar] → [sk .fs, class, ty, fieldvar] ,T ,fieldspec , ,elim ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPELIM : ⊦ class = fs .class ∧ ty = fs .type ∧ fieldvar = fs .field ↔ fs = mkfs(class, ty, fieldvar)])], [EXTRATERMS : (sk .fs, class, ty, fieldvar)]]