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Proof step 11 from proof isarray-okarray (previous step)

st[r -- _length] = intval(i), st[r -- _type] = typeval(mkarraytype(ty0)), is_reftype(ty0), r ∈ st, ty0 ≤ ty, r -- _type ∈ st, is_arrayref(r, i, st), r -- _length ∈ st, 0 ≤ i, j < i, 0 ≤ j, 0 < i, okval(st[r -- j '], ty) ⊦ r = jvmref, is_referencevalue(st[r -- j '])

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 10:
⊦ ¬ is_reftype(ty0) → (ty ≤ ty0 ↔ ty = ty0)

Rule argument

[speclemmaarg: ,¬ is_reftype(ty0) → (ty ≤ ty0 ↔ ty = ty0) ,[ty0, ty] → [ty, ty0] ,F ,typefuns , ,le-noreftype-01 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_reftype(ty) → ( okval(val, ty) ↔ is_referencevalue(val))])], [EXTRATERMS : (ty, ty0)]]