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Proof step 7 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, r ≠ jvmref ∧ (¬ is_valid_ref(str, r, st[r -- fs ', val]) ∨ ¬ (st[r -- fs ', val][r -- _type]) .type ≤ ty) ↔ r ≠ jvmref ∧ (¬ is_valid_ref(str, r, st) ∨ ¬ st[r -- _type] .type ≤ ty)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
r -- fs ' ∈ st, okval(st[r -- fs '], fs .type), okval(val, fs .type), r ∈ st, st[r -- _type] .type ≤ ty ⊦ r = jvmref, fs ' = _type, fs ' = _length, ¬ is_valid_ref(str, r, st[r -- fs ', val]) ↔ ¬ is_valid_ref(str, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ sk ≠ sk0 → (st[r -- sk, val][r0 -- sk0]) = st[r0 -- sk0]])]]