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Proof step 27 from proof junkref-class-01 (previous step)

st[r -- mkfs(class, ty, fieldvar) '] = refval(r0), is_obj(str, r, st), mkfs(class, ty, fieldvar) ' ∈ instfields(st[r -- _type] .type .class), junkrefs(str, r0 ' + refs, ty, st) ⊦ r0 = jvmref, (¬ st[r0 -- _type] .type ≤ ty ∨ junkref(str, r0, st)) ∧ (is_reftype(ty) ∨ ty = abstract_type)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ junkref(str, r, st) ↔ (∃ refs. refs ≠ [] ∧ refs .first = r ∧ junkrefs(str, refs, st[r -- _type] .type, st))
Proof step 26:
st[r -- mkfs(class, ty, fieldvar) '] = refval(r0), is_obj(str, r, st), mkfs(class, ty, fieldvar) ' ∈ instfields(st[r -- _type] .type .class), junkrefs(str, r0 ' + refs, ty, st) ⊦ r0 = jvmref, (¬ st[r0 -- _type] .type ≤ ty ∨ (∃ refs. refs ≠ [] ∧ refs .first = r0 ∧ junkrefs(str, refs, st[r0 -- _type] .type, st))) ∧ (is_reftype(ty) ∨ ty = abstract_type)

Rule argument

[crewrite-arg: junkref-def, F, [st, r, str] → [st, r0, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r0, str)]]