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Proof step 7 from proof validfield-superset (previous step)

r -- mkfs(class, ty, fieldvar) ' ∈ st0, r ∈ st0, is_reftype(ty), r -- mkfs(class, ty, fieldvar) ' ∈ st, r ∈ st, type∃(str, ty), st ⊆ st0, is_referencevalue(st[r -- mkfs(class, ty, fieldvar) ']), validrefval(str, st[r -- mkfs(class, ty, fieldvar) '], ty, st) ⊦ ty = void_type, validrefval(str, st[r -- mkfs(class, ty, fieldvar) '], ty, st0)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 6:
⊦ st ⊆ st0 ∧ validrefval(str, val, ty, st) → validrefval(str, val, ty, st0)

Rule argument

[crewrite-arg: validrefval-superset , F , [st, st0, str, val, ty] → [st, st0, str, st[r -- mkfs(class, ty, fieldvar) '], ty] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, st0, str, st[r -- mkfs(class, ty, fieldvar) '], ty)]]