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Proof step 3 from proof junkref-is-junk (previous step)

⊦ r = jvmref, is_valid_ref(str, r, st), junkrefs(str, r ', st[r -- _type] .type, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ junkrefs(str, r ', ty, st) ↔ r ≠ jvmref ∧ (¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ ty)

Rule argument

[crewrite-arg: junkrefs-one , F , [st, ty, r, str] → [st, st[r -- _type] .type, r, str] ]

Additional information

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