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Proof step 42 from proof validrefs-del-junkrefs (previous step)

junkrefs(str, r0 ' + r ', ty, st -- r), st[r0 -- _type] .type ≤ ty, is_valid_ref(str, r0, st) ⊦ r0 = jvmref, r = r0, validrefs(str, r0 ' + r ', ty, st), junkref(str, r0, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ is_valid_ref(str, r, st) ↔ is_obj(str, r, st) ∨ is_array(str, r, st)
Proof step 41:
junkrefs(str, r0 ' + r ', ty, st -- r), st[r0 -- _type] .type ≤ ty, is_obj(str, r0, st) ∨ is_array(str, r0, st) ⊦ r0 = jvmref, r = r0, validrefs(str, r0 ' + r ', ty, st), junkref(str, r0, st)

Rule argument

[speclemmaarg: ,is_valid_ref(str, r, st) ↔ is_obj(str, r, st) ∨ is_array(str, r, st) ,[st, r, str] → [st, r0, str] ,F ,addfuns , ,is-valid-ref-stronger-def ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r0, str)]]