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Proof step 18 from proof validrefs-put-badclassfield-01 (previous step)

st[r0 -- _type] .type = mkclasstype(class), st[r -- mkfs(class0, ty0, fieldvar) '] = refval(r1), validrefs(str, r1 ' + refs, ty0, st), junkref(str, r1, st), is_obj(str, r, st[r0 -- fs ', val]), is_classtype(st[r -- _type] .type), is_obj(str, r, st), st[r -- _type] .type ≤ ty, mkfs(class0, ty0, fieldvar) ' ∈ instfields(st[r -- _type] .type .class), r ≠ r0 ∨ mkfs(class0, ty0, fieldvar) ≠ fs ⊦ r = jvmref, fs ' = _type, dups((r1 ' + refs) .butlast), r ∈ (r1 ' + refs) .butlast, validrefs(str, r1 ' + refs, ty0, st[r0 -- fs ', val]), fs ' ∈ instfields(class), junkref(str, r, st), junkref(str, r, st[r0 -- fs ', val])

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[speclemmaarg: , is_obj(str, r, st) → ( junkref(str, r, st) ↔ (∃ fs. fs ' ∈ instfields(st[r -- _type] .type .class) ∧ is_referencevalue(st[r -- fs ']) ∧ st[r -- fs '] .refval ≠ jvmref ∧ ( ¬ st[st[r -- fs '] .refval -- _type] .type ≤ fs .type ∨ junkref(str, st[r -- fs '] .refval, st)))) ,[st, r, str] → [st, r, str] ,F ,junkrefs , ,junkref-class ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r, str)]]