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Proof step 4 from proof validrefs-void (previous step)

validrefs(str, refs, void_type, st) ⊦ refs = [], refs = jvmref '

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ ¬ is_reftype(ty) → (validrefs(str, refs, ty, st) ↔ refs = [] ∨ refs = jvmref ')

Rule argument

[crewrite-arg: validrefs-primtype , F , [st, ty, refs, str] → [st, void_type, refs, str] ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_reftype(void_type)])], [EXTRATERMS : (st, void_type, refs, str)]]