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Proof step 5 from proof junkref-null (previous step)

junkref(str, jvmref, st) ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ junkref(str, r, st) ↔ (∃ refs. refs ≠ [] ∧ refs .first = r ∧ junkrefs(str, refs, st[r -- _type] .type, st))
Proof step 4:
∃ refs. refs ≠ [] ∧ refs .first = jvmref ∧ junkrefs(str, refs, st[jvmref -- _type] .type, st) ⊦

Rule argument

[crewrite-arg: junkref-def, F, [st, r, str] → [st, jvmref, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, jvmref, str)]]