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Proof step 43 from proof junkref-class-01 (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 42:
⊦ junkrefs(str, r ', ty, st) ↔ r ≠ jvmref ∧ (¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ ty)

Rule argument

[crewrite-arg: junkrefs-one, F, [st, ty, r, str] → [st, ty, r0, str]]

Additional information

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