--- /dev/null
+# Nit:
+<A: true a 0.123 1234 asdf false>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null}
+
+# Nit:
+<B: <A: false b 123.123 2345 hjkl false> 1111 qwer>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "ii": 1111, "ss": "qwer"}
+
+# Nit:
+<C: <A: true a 0.123 1234 asdf false> <B: <A: false b 123.123 2345 hjkl false> 1111 qwer>>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "C", "a": {"__kind": "obj", "__id": 1, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null}, "b": {"__kind": "obj", "__id": 2, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "ii": 1111, "ss": "qwer"}, "aa": {"__kind": "ref", "__id": 1}}
+
+# Nit:
+<D: <B: <A: false b 123.123 2345 new line ->
+<- false> 1111 f"\r\/> true>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "D", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "new line ->\n<-", "n": null, "ii": 1111, "ss": "\tf\"\r\\\/", "d": {"__kind": "ref", "__id": 0}}
+
--- /dev/null
+# Nit:
+<A: true a 0.123 1234 asdf false>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null}
+
+# Nit:
+<B: <A: false b 123.123 2345 hjkl false> 1111 qwer>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "ii": 1111, "ss": "qwer"}
+
+# Nit:
+<C: <A: true a 0.123 1234 asdf false> <B: <A: false b 123.123 2345 hjkl false> 1111 qwer>>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "C", "a": {"__kind": "obj", "__id": 1, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null}, "b": {"__kind": "obj", "__id": 2, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "ii": 1111, "ss": "qwer"}, "aa": {"__kind": "ref", "__id": 1}}
+
+# Nit:
+<D: <B: <A: false b 123.123 2345 new line ->
+<- false> 1111 f"\r\/> true>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "D", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "new line ->\n<-", "n": null, "ii": 1111, "ss": "\tf\"\r\\\/", "d": {"__kind": "ref", "__id": 0}}
+
--- /dev/null
+# Nit:
+<A: true a 0.123 1234 asdf false>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null, "iii": 6789, "sss": "redef"}
+
+# Nit:
+<B: <A: false b 123.123 2345 hjkl false> 1111 qwer>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "iii": 6789, "sss": "redef", "ii": 1111, "ss": "qwer"}
+
+# Nit:
+<C: <A: true a 0.123 1234 asdf false> <B: <A: false b 123.123 2345 hjkl false> 1111 qwer>>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "C", "a": {"__kind": "obj", "__id": 1, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null, "iii": 6789, "sss": "redef"}, "b": {"__kind": "obj", "__id": 2, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "iii": 6789, "sss": "redef", "ii": 1111, "ss": "qwer"}, "aa": {"__kind": "ref", "__id": 1}}
+
+# Nit:
+<D: <B: <A: false b 123.123 2345 new line ->
+<- false> 1111 f"\r\/> true>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "D", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "new line ->\n<-", "n": null, "iii": 6789, "sss": "redef", "ii": 1111, "ss": "\tf\"\r\\\/", "d": {"__kind": "ref", "__id": 0}}
+
--- /dev/null
+# Nit:
+<A: true a 0.123 1234 asdf false>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null}
+
+# Nit:
+<B: <A: false b 123.123 2345 hjkl false> 1111 qwer>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "ii": 1111, "ss": "qwer", "ffff": 6.789, "bbbb": false}
+
+# Nit:
+<C: <A: true a 0.123 1234 asdf false> <B: <A: false b 123.123 2345 hjkl false> 1111 qwer>>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "C", "a": {"__kind": "obj", "__id": 1, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null}, "b": {"__kind": "obj", "__id": 2, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "ii": 1111, "ss": "qwer", "ffff": 6.789, "bbbb": false}, "aa": {"__kind": "ref", "__id": 1}}
+
+# Nit:
+<D: <B: <A: false b 123.123 2345 new line ->
+<- false> 1111 f"\r\/> true>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "D", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "new line ->\n<-", "n": null, "ii": 1111, "ss": "\tf\"\r\\\/", "ffff": 6.789, "bbbb": false, "d": {"__kind": "ref", "__id": 0}}
+
--- /dev/null
+# Nit:
+<A: true a 0.123 1234 asdf false>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null, "iii": 6789, "sss": "redef"}
+
+# Nit:
+<B: <A: false b 123.123 2345 hjkl false> 1111 qwer>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "iii": 6789, "sss": "redef", "ii": 1111, "ss": "qwer", "ffff": 6.789, "bbbb": false}
+
+# Nit:
+<C: <A: true a 0.123 1234 asdf false> <B: <A: false b 123.123 2345 hjkl false> 1111 qwer>>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "C", "a": {"__kind": "obj", "__id": 1, "__class": "A", "b": true, "c": 'a', "f": 0.123, "i": 1234, "s": "asdf", "n": null, "iii": 6789, "sss": "redef"}, "b": {"__kind": "obj", "__id": 2, "__class": "B", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "hjkl", "n": null, "iii": 6789, "sss": "redef", "ii": 1111, "ss": "qwer", "ffff": 6.789, "bbbb": false}, "aa": {"__kind": "ref", "__id": 1}}
+
+# Nit:
+<D: <B: <A: false b 123.123 2345 new line ->
+<- false> 1111 f"\r\/> true>
+
+# Json:
+{"__kind": "obj", "__id": 0, "__class": "D", "b": false, "c": 'b', "f": 123.123, "i": 2345, "s": "new line ->\n<-", "n": null, "iii": 6789, "sss": "redef", "ii": 1111, "ss": "\tf\"\r\\\/", "ffff": 6.789, "bbbb": false, "d": {"__kind": "ref", "__id": 0}}
+
--- /dev/null
+import serialization
+import json_serialization
+
+# Simple class
+class A
+ auto_serializable
+ super Serializable
+
+ var b: Bool
+ var c: Char
+ var f: Float
+ var i: Int
+ var s: String
+ var n: nullable Int
+
+ init(b: Bool, c: Char, f: Float, i: Int, s: String, n: nullable Int)
+ do
+ self.b = b
+ self.c = c
+ self.f = f
+ self.i = i
+ self.s = s
+ end
+
+ redef fun to_s do return "<A: {b} {c} {f} {i} {s} {n != null}>"
+end
+
+# Sub-class of A
+class B
+ auto_serializable
+ super A
+
+ var ii: Int
+ var ss: String
+
+ init(b: Bool, c: Char, f: Float, i: Int, s: String, n: nullable Int, ii: Int, ss: String)
+ do
+ super(b, c, f, i, s, n)
+
+ self.ii = ii
+ self.ss = ss
+ end
+
+ redef fun to_s do return "<B: {super} {ii} {ss}>"
+end
+
+# Composed of an A and a B
+class C
+ auto_serializable
+ super Serializable
+
+ var a: A
+ var b: B
+ var aa: A
+
+ init(a: A, b: B)
+ do
+ self.a = a
+ self.b = b
+ self.aa = a
+ end
+
+ redef fun to_s do return "<C: {a} {b}>"
+end
+
+# Class with cyclic reference
+class D
+ auto_serializable
+ super B
+
+ var d: nullable D = null
+
+ redef fun to_s do return "<D: {super} {d != null}>"
+end
+
+var a = new A(true, 'a', 0.1234, 1234, "asdf", null)
+var b = new B(false, 'b', 123.123, 2345, "hjkl", 12, 1111, "qwer")
+var c = new C(a, b)
+var d = new D(false, 'b', 123.123, 2345, "new line ->\n<-", null, 1111, "\t\f\"\r\\/")
+d.d = d
+
+for o in new Array[nullable Serializable].with_items(a, b, c, d) do
+ var stream = new StringOStream
+ var serializer = new JsonSerializer(stream)
+ serializer.serialize(o)
+
+ print "# Nit:\n{o}\n"
+ print "# Json:\n{stream}\n"
+end
--- /dev/null
+import test_serialization
+
+redef class A
+#alt0# auto_serializable
+#alt2# auto_serializable
+
+ var iii = 6789
+ var sss = "redef"
+end
+
+redef class B
+#alt1# auto_serializable
+#alt2# auto_serializable
+
+ var ffff = 6.789
+ var bbbb = false
+end
+
+super