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Proof step 8 from proof validfield-one (previous step)

sk .fs = mkfs(class, ty, fieldvar) ⊦ goodfieldandtype(r, sk, st) ∧ type∃(str, sk .fs .type) ∧ sk .fs .type ≠ void_type ∧ (is_reftype(sk .fs .type) → validrefval(str, st[r -- sk], sk .fs .type, st)) ↔ ¬ is_indexkey(sk) ∧ r -- sk ∈ st ∧ type∃(str, ty) ∧ ty ≠ void_type ∧ validval(str, st[r -- sk], ty, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
sk .fs = mkfs(class, ty, fieldvar), type∃(str, ty) ⊦ goodfieldandtype(r, sk, st) ∧ (is_reftype(ty) → validrefval(str, st[r -- sk], ty, st)) ↔ ¬ is_indexkey(sk) ∧ r -- sk ∈ st ∧ validval(str, st[r -- sk], ty, st), ty = void_type

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkfs(class, ty, fieldvar) .type = ty])]]