type Bool = class {
  declare unop ! Bool;

  declare binop &&(b Bool) Bool;
  declare binop ||(b Bool) Bool;
};

type Int = class {
  declare unop + Int;
  declare unop - Int;

  declare binop ==(Int) Bool;
  declare binop !=(Int) Bool;
  declare binop >(Int) Bool;
  declare binop <(Int) Bool;
  declare binop >=(Int) Bool;
  declare binop <=(Int) Bool;

  declare binop +(Int) Int;
  declare binop -(Int) Int;
  declare binop *(Int) Int;
  declare binop /(Int) Int;
  declare binop %(Int) Int;

  declare factory (f Float);
  declare factory ();

  declare fn str() String; 
};