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Proof step 1 from proof gfts-not (previous step)

⊦ ¬ goodfieldsandtypes(r, sks, st[r0 -- mkfs(class0, ty, fieldvar) ', val]) ∧ mkfs(class0, ty, fieldvar) ' ≠ _type ∧ oktype(val, ty, st) → ¬ goodfieldsandtypes(r, sks, st)

Lemma gfts-not-01