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Proof step 13 from proof validref-put-norefval (conclusion)

⊦ ¬ is_referencevalue(val) ∧ validref(str, r, ty, st) ∧ is_fskey(sk) ∧ oktype(val, sk .fs .type, st) ∧ sk .fs .type ≠ void_type ∧ sk ≠ _length → validref(str, r, ty, st[r1 -- sk, val])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 12:
validref(str, r, ty, st), is_fskey(sk), okval(val, sk .fs .type) ⊦ sk = _length, sk .fs .type = void_type, validref(str, r, ty, st[r1 -- sk, val]), is_referencevalue(val)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ oktype(val, ty, st) ↔ okval(val, ty)])]]