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Proof step 9 from proof validfield-levelsubset (previous step)

sk .fs = mkfs(class, ty, fieldvar), level⊆(str, str0), goodfieldandtype(r, sk, st), type∃(str, ty), is_reftype(ty), type∃(str0, ty), validrefval(str, st[r -- sk], ty, st) ⊦ ty = void_type, validrefval(str0, st[r -- sk], ty, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ validrefval(str, val, ty, st) ↔ is_referencevalue(val) ∧ validref(str, val .refval, ty, st)
Proof step 8:
sk .fs = mkfs(class, ty, fieldvar), level⊆(str, str0), goodfieldandtype(r, sk, st), type∃(str, ty), is_reftype(ty), type∃(str0, ty), is_referencevalue(st[r -- sk]) ∧ validref(str, st[r -- sk] .refval, ty, st) ⊦ ty = void_type, validrefval(str0, st[r -- sk], ty, st)

Rule argument

[crewrite-arg: validrefval-def , F , [st, ty, val, str] → [st, ty, st[r -- sk], str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, ty, st[r -- sk], str)]]