Burak Emir burakemir

	YEAR	DESCRIPTION
	1968	Elefants Druk and Chukha arrive in Zurich Zoo
	1976	Snow leopards move to a new area
	1979	Zoo Zurich has 21 millionth visitor
	1979	on occasion of 50th anniversary entry fee reduced to 1 CHF
	1985	first PC installed

	class Foo {
	covariant double? _zoo = 3.14;

	set zoo(covariant double? o) {_zoo = o;}
	double? get zoo => _zoo;
	}

	class Bar extends Foo {
	@override double _zoo = 2.3;
	@override set zoo(double o) {_zoo = o;}

	class Foo {}
	class Bar extends Foo {}

	void main() {
	Map<String, Foo> m = {};
	Map<String, Bar> n = {};
	m = n;
	m["a"] = Foo();
	// Uncaught Error: TypeError: Instance of 'Foo': type 'Foo' is not a subtype of type 'Bar'
	}

	#lang reader "test-lang-reader.rkt"
	(+ 1 2)