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Proof step 3 from proof junkref-keyin (previous step)

⊦ r = jvmref, r -- _type ∈ st, junkref(str, r, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ r ≠ jvmref ∧ ¬ is_valid_ref(str, r, st) → junkref(str, r, st)

Rule argument

[crewrite-arg: junkref-is-junk, F, [st, r, str] → [st, r, str]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ r -- _type ∈ st → ¬ is_valid_ref(str, r, st)])], [EXTRATERMS : (st, r, str)]]