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Proof step 6 from proof validrefnotnull-isvalidref (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ validrefnotnull(str, r, ty, st) ↔ r ≠ jvmref ∧ validref(str, r, ty, st)
Proof step 5:
r ≠ jvmref ∧ validref(str0, r, mkclasstype(str .class), st), is_array(str0, r, st) ⊦ str = `java.lang.Object', r = jvmref

Rule argument

[crewrite-arg: validrefnotnull-def , F , [st, ty, r, str] → [st, mkclasstype(str .class), r, str0] ]

Additional information

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