What it does have is compile-time parameters where you can bind a type variable during compilation:

  fn max(comptime T: type, a: T, b: T) T {
      if (T == bool) {
          return a or b;
      } else if (a > b) {
          return a;
      } else {
          return b;
      }
  }

The type variable isn't used at run-time.