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Proof step 5 from proof validref-nopath-superset (previous step)

is_valid_ref(str, r, st0), newref(r, st), st ⊆ st0, validrefnotnull(str, r, st[r -- _type] .type, st) ⊦ r = jvmref, newref(r, st0)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[speclemmaarg: , validrefnotnull(str, r, ty, st) ↔ r ≠ jvmref ∧ validref(str, r, ty, st) ,[st, ty, r, str] → [st, st[r -- _type] .type, r, str] ,F ,junkrefs , ,validrefnotnull-def ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ newref(r, st) → ¬ validref(str, r, ty, st)])], [EXTRATERMS : (st, st[r -- _type] .type, r, str)]]