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Proof step 2 from proof validref-isvalidref (previous step)

validref(str0, r, mkclasstype(str .class), st), is_array(str0, r, st) ⊦ str = `java.lang.Object'

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
str ≠ `java.lang.Object' ⊦ is_array(str0, r, st) → ¬ validref(str0, r, mkclasstype(((* str)) .class), st)

Rule argument

[crewrite-arg: validref-array-03 , F , [st, str, r, str0] → [st, str, r, str0] ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, str, r, str0)]]