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Proof step 8 from proof isobj-field-in (previous step)

st[r -- _type] = typeval(mkclasstype(class0)), class0 ≤ class, sk ∈ instfields(class), r -- _type ∈ st, is_obj(r, class0, st), r ∈ st ⊦ r = jvmref, r -- sk ∈ st

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ is_obj(r, class, st) ↔ r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class)) ∈ st ∧ goodfieldsandtypes(r, instfields(class), st)
Proof step 7:
st[r -- _type] = typeval(mkclasstype(class0)), class0 ≤ class, sk ∈ instfields(class), r -- _type ∈ st, r ≠ jvmref ∧ (r -- _type) × typeval(mkclasstype(class0)) ∈ st ∧ goodfieldsandtypes(r, instfields(class0), st), r ∈ st ⊦ r = jvmref, r -- sk ∈ st

Rule argument

[crewrite-arg: is_obj-def, F, [st, class, r] → [st, class0, r]]

Additional information

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