---- h1
10
---- h2
3
10
0
---- h3
10
30
4
---- inv
10
match1.lean:82:0-82:73: error: dependent elimination failed, type mismatch when solving alternative with type
  motive 0 (Vec.cons head✝ Vec.nil) ⋯
but expected
  motive x✝ (Vec.cons head✝ tail✝) ⋯
[false, true, true]
match1.lean:119:0-119:41: error: dependent match elimination failed, inaccessible pattern found
  .(j + j)
constructor expected
[false, true, true]
match1.lean:136:7-136:22: error: invalid match-expression, type of pattern variable 'a' contains metavariables
  ?m
fun x => ?m : ?m × ?m → ?m
fun x =>
  match x with
  | (a, b) => a + b : Nat × Nat → Nat
fun x =>
  match x with
  | (a, b) => a && b : Bool × Bool → Bool
fun x =>
  match x with
  | (a, b) => a + b : Nat × Nat → Nat
fun x x_1 =>
  match x, x_1 with
  | some a, some b => some (a + b)
  | x, x_2 => none : Option Nat → Option Nat → Option Nat
fun x =>
  (match (motive := Nat → Nat → Nat) x with
    | 0 => id
    | x.succ => id)
    x : Nat → Nat
fun x =>
  match x with
  | #[1, 2] => 2
  | #[] => 0
  | #[3, 4, 5] => 3
  | x => 4 : Array Nat → Nat
g.match_1.{u_1, u_2} {α : Type u_1} (motive : List α → Sort u_2) (x✝ : List α) (h_1 : (a : α) → motive [a])
  (h_2 : (x : List α) → motive x) : motive x✝
fun e => nomatch e : Empty → False