Set: pp::colors
  Set: pp::unicode
sig x : ℕ, x > 0 : Type
pair 10 20 : ℕ ⨯ ℕ
pair 10 ⊤ : ℕ ⨯ Bool
pair ⊤ 20 : Bool ⨯ ℕ
pair ⊤ 20 : Bool ⨯ ℕ
pair ⊤ ⊤ : Bool ⨯ Bool
pair ⊤ ⊤ : Bool ⨯ Bool
  Assumed: a
  Assumed: Ha
  Defined: NZ
NZ : Type
pair a Ha : NZ : sig x : ℕ, 1 ≤ x
sig2.lean:13:6: error: type mismatch in the 1st argument of the pair
    pair ⊤ 20
Pair type:
    ℕ ⨯ ℕ
Argument type:
    Bool
sig2.lean:14:6: error: type mismatch in the 2nd argument of the pair
    pair ⊤ 20
Pair type:
    Bool ⨯ Bool
Argument type:
    ℕ