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Proof step 17 from proof junkref-class-01 (previous step)

st[r -- _type] = typeval(mkclasstype(class0)), st[r -- mkfs(class, ty, fieldvar) '] = refval(r0), r ∈ st, class+∃(str, class0), is_obj(r, class0, st), r -- _type ∈ st, mkfs(class, ty, fieldvar) ' ∈ instfields(class0), junkrefs(str, r0 ' + refs, ty, st) ⊦ r = jvmref, ty = abstract_type, r0 = jvmref, is_reftype(ty), is_abstract(class0)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 12:
⊦ is_obj(r, class, st) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ goodfieldsandtypes(r, instfields(class), st)
Proof step 16:
st[r -- _type] = typeval(mkclasstype(class0)), st[r -- mkfs(class, ty, fieldvar) '] = refval(r0), r ∈ st, class+∃(str, class0), r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class0)) ∈ st ∧ goodfieldsandtypes(r, instfields(class0), st), r -- _type ∈ st, mkfs(class, ty, fieldvar) ' ∈ instfields(class0), junkrefs(str, r0 ' + refs, ty, st) ⊦ r = jvmref, ty = abstract_type, r0 = jvmref, is_reftype(ty), is_abstract(class0)

Rule argument

[speclemmaarg: , is_obj(r, class, st) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ goodfieldsandtypes(r, instfields(class), st) ,[st, class, r] → [st, class0, r] ,F ,addfuns , ,is_obj-def ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, class0, r)]]