Set: pp::colors
  Set: pp::unicode
  Imported 'int'
10 + 20 : ℕ
10 : ℕ
10 - 20 : ℤ
-10
5
15 + 10 - 20 : ℤ
  Assumed: x
  Assumed: n
  Assumed: m
n + m
n + x + m
  Set: lean::pp::coercion
nat_to_int n + x + nat_to_int m + nat_to_int 10
x + nat_to_int n + nat_to_int m + nat_to_int 10
nat_to_int (n + m + 10) + x
  Set: lean::pp::notation
Int::add (nat_to_int (Nat::add (Nat::add n m) 10)) x