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Proof step 4 from proof validref-array-rec (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ validref(str, r, ty, st) ↔ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st)

Rule argument

[crewrite-arg: validref-def , 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)]]