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Proof step 24 from proof junkref-put-badfield (previous step)

junkrefs(str, r ' + refs0, st[r -- _type] .type, st[r0 -- fs ', val]), r ≠ r0 ∨ _type ≠ fs ' ⊦ junkref(str, r, st), is_typevalue(st[r0 -- _type]) ∧ is_reftype(st[r0 -- _type] .type)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 22:
⊦ ¬ junkrefs(str, refs, ty, st) ∧ ¬ (is_typevalue(st[r0 -- _type]) ∧ is_reftype(st[r0 -- _type] .type)) → ¬ junkrefs(str, refs, ty, st[r0 -- fs ', val])
Proof step 23:
⊦ ¬ junkref(str, r, st) → (junkrefs(str, r ' + refs0, st[r -- _type] .type, st) ↔ false)

Rule argument

[crewrite-arg: junkrefs-put-badfield , F , [val, fs, r0, st, ty, refs, str] → [val, fs, r0, st, st[r -- _type] .type, r ' + refs0, str] ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1])], [EXTRATERMS : (val, fs, r0, st, st[r -- _type] .type, r ' + refs0, str)]]