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Proof step 9 from proof junkrefs-put-notin-butlast (previous step)

r -- fs ' ∈ st, okval(st[r -- fs '], fs .type), okval(val, fs .type), r ∈ st ⊦ fs ' = _type, fs ' = _length, junkrefs(str, r ', ty, st[r -- fs ', val]) ↔ junkrefs(str, r ', ty, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ junkrefs(str, r ', ty, st) ↔ r ≠ jvmref ∧ (¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ ty)
Proof step 8:
r -- fs ' ∈ st, okval(st[r -- fs '], fs .type), okval(val, fs .type), r ∈ st ⊦ fs ' = _type, fs ' = _length, junkrefs(str, r ', ty, st[r -- fs ', val]) ↔ r ≠ jvmref ∧ (¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ ty)

Rule argument

[crewrite-arg: junkrefs-one, F, [st, ty, r, str] → [st, ty, r, str]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, ty, r, str)]]