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Proof step 4 from proof validval-index-norefval (previous step)

⊦ (is_fskey(i ') → validval(str, val, i ' .fs .type, st) ∧ i ' .fs .type ≠ void_type ∧ i ' ≠ _length) ∧ (is_indexkey(i ') → validval(str, val, st[r -- _type] .type .type, st)) ↔ okval(val, st[r -- _type] .type .type), is_referencevalue(val)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ validval(str, val, st[r -- _type] .type .type, st) ↔ okval(val, st[r -- _type] .type .type), is_referencevalue(val)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_indexkey(i ')], [CSIMPSEQ : ⊦ ¬ is_fskey(i ')])]]