:play
1 + 2;
3 + 4;
$0 + $1;
define class <foo> (<object>)
  slot a, init-keyword: a:;
end class <foo>;
make(<foo>, a: 10);
$3.a = 10;
define class <bar> (<foo>)
  slot b, init-keyword: b:;
end class <bar>;
make(<bar>, a: 20, b: 30);
$5.a = 20;
$5.b = 30;
define function foo (x :: <integer>)
  x + 1
end;
foo(5);
define function foo (x :: <integer>)
  x + 2
end;
foo(5);
:exit