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Proof step 19 from proof nopathex-badarrayfield (previous step)

fs ' = _length, is_valid_ref(str, r, st), validrefs(str, r ' + refs + r0 ', st[r -- _type] .type, st), is_arraytype(st[r0 -- _type] .type), contains(str, st[r -- _type] .type ' + tys + st[r0 -- _type] .type '), type∃(str, st[r -- _type] .type) ⊦ r = r0, r0 = jvmref, r = jvmref, is_reftype(st[r0 -- _type] .type)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 18:
⊦ is_reftype(ty) ↔ is_classtype(ty) ∨ is_arraytype(ty)

Rule argument

[speclemmaarg: ,is_reftype(ty) ↔ is_classtype(ty) ∨ is_arraytype(ty) ,[ty] → [st[r0 -- _type] .type] ,F ,typefuns , ,is-reftype ]

Additional information

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