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Proof step 9 from proof validfield-put-statfield (previous step)

r -- sk0 ≠ jvmref -- sk, sk0 .fs = mkfs(class, ty, fieldvar), r ≠ jvmref ∨ sk ≠ sk0, r ≠ jvmref ∨ sk0 ≠ sk ⊦ goodfieldandtype(r, sk0, st[jvmref -- sk, val]) ∧ type∃(str, ty) ∧ ty ≠ void_type ∧ (is_reftype(ty) → validrefval(str, st[r -- sk0], ty, st)) ↔ validfield(str, r, sk0, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
sk0 .fs = mkfs(class, ty, fieldvar), r ≠ jvmref ∨ sk ≠ sk0, r ≠ jvmref ∨ sk0 ≠ sk ⊦ goodfieldandtype(r, sk0, st[jvmref -- sk, val]) ∧ type∃(str, ty) ∧ ty ≠ void_type ∧ (is_reftype(ty) → validrefval(str, st[r -- sk0], ty, st)) ↔ validfield(str, r, sk0, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ r -- sk = r0 -- sk0 ↔ ¬ ¬ (r = r0 ∧ sk = sk0)])]]