simp
case h1.refl
α σ : Type
ε : σ → Type
δ : Dialect α σ ε
τ : MLIRType δ
v : MLIRType.eval τ
head : SSAVal × (τ : MLIRType δ) × MLIRType.eval τ
tail : List (SSAVal × (τ : MLIRType δ) × MLIRType.eval τ)
headName : SSAVal
HInd : getT headName tail = some { fst := τ, snd := v } → get headName tail τ = some v
headVal : MLIRType.eval τ
⊢ HEq headVal v →
    (if h : τ = τ then
        some
          (cast
            (_ :
              (match (headName, { fst := τ, snd := headVal }).2.fst with
                | MLIRType.float a => Float
                | MLIRType.int signedness sz => FinInt sz
                | MLIRType.tensor1d => Tensor1D
                | MLIRType.tensor2d => Tensor2D
                | MLIRType.tensor4d => Tensor4D
                | MLIRType.index => ℤ
                | MLIRType.undefined a => Unit
                | MLIRType.extended σ => ε σ
                | MLIRType.erased => Unit) =
                match τ with
                | MLIRType.float a => Float
                | MLIRType.int signedness sz => FinInt sz
                | MLIRType.tensor1d => Tensor1D
                | MLIRType.tensor2d => Tensor2D
                | MLIRType.tensor4d => Tensor4D
                | MLIRType.index => ℤ
                | MLIRType.undefined a => Unit
                | MLIRType.extended σ => ε σ
                | MLIRType.erased => Unit)
            headVal)
      else none) =
      some v
no goals