have : (1 : Part ℕ) = Part.some 1 := rfl
k : ℕ
c : Code k
f : Vector ℕ k →. ℕ
n✝ y : ℕ
v : Fin n✝ → ℕ
⊢ y = 1 ↔ 1 = Part.some y
k : ℕ
c : Code k
f : Vector ℕ k →. ℕ
n✝ y : ℕ
v : Fin n✝ → ℕ
this : 1 = Part.some 1
⊢ y = 1 ↔ 1 = Part.some y