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Proof step 22 from proof junkref-array (previous step)

st[r -- i '] = refval(r0), is_array(str, r, st), i < st[r -- _length] .intval, 0 ≤ i, 0 < st[r -- _length] .intval ⊦ r0 = jvmref, st[r0 -- _type] .type ≤ st[r -- _type] .type .type, junkrefs(str, r0 ', st[r -- _type] .type .type, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 21:
⊦ 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, st[r -- _type] .type .type, r0, str] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, st[r -- _type] .type .type, r0, str)]]