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Proof step 4 from proof reffield-null (conclusion)

⊦ ¬ has_reffield(jvmref, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ ¬ is_valid_ref(r, st) → ¬ has_reffield(r, st)
Proof step 3:
¬ ¬ is_valid_ref(jvmref, st) ⊦ ¬ has_reffield(jvmref, st)

Rule argument

[crewrite-arg: has_reffield-no, F, [st, r] → [st, jvmref]]

Additional information

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