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Proof step 8 from proof validrefs-all-same (previous step)

⊦ is_obj(str, r, st) ↔ class+∃(str, st[r -- _type] .type .class) ∧ ¬ is_abstract(st[r -- _type] .type .class) ∧ r ≠ jvmref ∧ r -- _type ∈ st ∧ is_typevalue(st[r -- _type]) ∧ is_classtype(st[r -- _type] .type) ∧ (r -- _type) × st[r -- _type] ∈ st ∧ goodfieldsandtypes(r, instfields(st[r -- _type] .type .class), st)

A spec-lemma