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Proof step 16 from proof validfield-superset (previous step)

sk .fs = mkfs(class, ty, fieldvar), st ⊆ st0, 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)) ⊦ goodfieldandtype(r, sk, st0) ∧ type∃(str, ty) ∧ ty ≠ void_type ∧ (is_reftype(ty) → validrefval(str, st0[r -- sk], ty, st0))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 15:
sk .fs = mkfs(class, ty, fieldvar), goodfieldandtype(r, sk, st), st ⊆ st0, type∃(str, ty), is_reftype(ty) → validrefval(str, st[r -- sk], ty, st) ⊦ ty = void_type, goodfieldandtype(r, sk, st0) ∧ (is_reftype(ty) → validrefval(str, st0[r -- sk], ty, st0))

Rule argument

[emptyarg]

Additional information

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