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Proof step 15 from proof is_obj-no-refval (conclusion)

mkfs(str2 .class, mkclasstype(str0 .class), str1 .field) ' ∈ instfields(st[r -- _type] .type .class) ⊦ ¬ is_referencevalue(st[r -- mkfs(((* str2)) .class, mkclasstype(((* str0)) .class), ((* str1)) .field) ']) → ¬ is_obj(str, r, st)

Special step normalize

And obtained the following new goals

Proof step 14:
mkfs(str2 .class, mkclasstype(str0 .class), str1 .field) ' ∈ instfields(st[r -- _type] .type .class) ⊦ ¬ is_referencevalue(st[r -- mkfs(str2 .class, mkclasstype(str0 .class), str1 .field) ']) → ¬ is_obj(str, r, st)