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Proof step 3 from proof okfieldinits-one (previous step)

sk .fs = mkfs(class0, ty, fieldvar), okfieldinits(class, (sk × val) ') ↔ is_fskey(sk) ∧ val = initial_value(ty) ∧ class0 = class ∧ ty ≠ abstract_type ⊦ okfieldinits(class, (sk × val) ') ↔ ¬ is_indexkey(sk) ∧ val = initial_value(ty) ∧ class0 = class ∧ ty ≠ abstract_type

User applied rule case distinction

And closed the goal!

Rule argument

[CASEDARG : pos: right 1, ()]

Additional information

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