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Proof step 18 from proof validval-putrkvs (previous step)

sk .fs = mkfs(class, ty, fieldvar), validvals(str, rkvs, st), ¬ is_fskey(sk) → validval(str, val, st[r -- _type] .type .type, st), ¬ is_indexkey(sk) → validval(str, val, ty, st) ∧ ty ≠ void_type ∧ sk ≠ _length ⊦ is_fskey(sk) → validval(str, val, ty, st[rkvs]) ∧ ty ≠ void_type ∧ sk ≠ _length

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 17:
sk .fs = mkfs(class, ty, fieldvar), is_fskey(sk), validvals(str, rkvs, st), validval(str, val, ty, st) ⊦ sk = _length, ty = void_type, validval(str, val, ty, st[rkvs])

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_indexkey(sk) ↔ is_fskey(sk)], [CSIMPSEQ : ⊦ is_indexkey(sk) → ¬ is_fskey(sk)])]]