+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2009 Jean Privat <jean@pryen.org>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import kernel
+
+class A
+ init do end
+end
+
+class B
+special A
+ meth foo(i: Int) do i.output
+ init do end
+end
+
+meth maybe: Bool do return true
+
+var a: A = new B
+
+assert a isa B
+a.foo(1)
+if maybe then
+ a = new A
+else
+ a = new A
+end
+#alt1#a.foo(1)
+
+a = new B
+assert a isa B
+a.foo(2)
+if maybe then
+else
+ a = new A
+end
+#alt2#a.foo(2)
+
+a = new B
+assert a isa B
+a.foo(3)
+if maybe then
+ a = new A
+else
+end
+#alt3#a.foo(3)
+
+a = new B
+assert a isa B
+a.foo(4)
+if maybe then
+else
+end
+a.foo(4)
+
+a = new B
+assert a isa B
+a.foo(5)
+if maybe then
+ a = new A
+end
+#alt4#a.foo(5)
+
+a = new B
+assert a isa B
+a.foo(6)
+if maybe then
+end
+a.foo(6)
+
+a = new B
+assert a isa B
+a.foo(7)
+while not maybe do
+ #alt5#a = new A
+end
+a.foo(7)
+
+a = new B
+assert a isa B
+a.foo(8)
+while not maybe do
+end
+a.foo(8)
+