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Proof step 5 from proof validfield-one (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
sk .fs = mkfs(class, ty, fieldvar), r ∈ st, r -- sk ∈ st, type∃(str, ty), okval(st[r -- sk], ty) ⊦ ty = void_type, is_fskey(sk) ∧ (is_reftype(ty) → validrefval(str, st[r -- sk], ty, st)) ↔ ¬ is_indexkey(sk) ∧ (is_referencevalue(st[r -- sk]) → validrefval(str, st[r -- sk], ty, st))

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ mkfs(class, ty, fieldvar) .type = ty], [CSIMPFORWARD : ⊦ r -- sk ∈ st → r ∈ st])]]