have : (0 : Part ℕ) = Part.some 0 := rfl
k : ℕ
c : Code k
f : Vector ℕ k →. ℕ
n✝ y : ℕ
v : Fin n✝ → ℕ
⊢ y = 0 ↔ 0 = Part.some y
k : ℕ
c : Code k
f : Vector ℕ k →. ℕ
n✝ y : ℕ
v : Fin n✝ → ℕ
this : 0 = Part.some 0
⊢ y = 0 ↔ 0 = Part.some y