+# This file is part of NIT ( http://www.nitlanguage.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
+
+var i = 1
+var b = true
+var f = 1u8
+var ni: nullable Int = 1
+var nb: nullable Bool = true
+var nf: nullable Byte = 1u8
+var oi: nullable Object = 1
+var ob: nullable Object = true
+var of: nullable Object = 1u8
+
+
+(i.is_same_instance(i)).output
+(b.is_same_instance(i)).output
+(f.is_same_instance(i)).output
+
+'\n'.output
+
+(i.is_same_instance(ni)).output
+(b.is_same_instance(ni)).output
+(f.is_same_instance(ni)).output
+
+'\n'.output
+
+(i.is_same_instance(oi)).output
+(b.is_same_instance(oi)).output
+(f.is_same_instance(oi)).output
+
+'\n'.output
+'\n'.output
+
+(ni.is_same_instance(i)).output
+(nb.is_same_instance(i)).output
+(nf.is_same_instance(i)).output
+
+'\n'.output
+
+(ni.is_same_instance(ni)).output
+(nb.is_same_instance(ni)).output
+(nf.is_same_instance(ni)).output
+
+'\n'.output
+
+(ni.is_same_instance(oi)).output
+(nb.is_same_instance(oi)).output
+(nf.is_same_instance(oi)).output
+
+'\n'.output
+'\n'.output
+
+(oi.is_same_instance(i)).output
+(ob.is_same_instance(i)).output
+(of.is_same_instance(i)).output
+
+'\n'.output
+
+(oi.is_same_instance(ni)).output
+(ob.is_same_instance(ni)).output
+(of.is_same_instance(ni)).output
+
+'\n'.output
+
+(oi.is_same_instance(oi)).output
+(ob.is_same_instance(oi)).output
+(of.is_same_instance(oi)).output
+
+'\n'.output
+'\n'.output
+'\n'.output
+
+(i.is_same_instance(b)).output
+(b.is_same_instance(b)).output
+(f.is_same_instance(b)).output
+
+'\n'.output
+
+(i.is_same_instance(nb)).output
+(b.is_same_instance(nb)).output
+(f.is_same_instance(nb)).output
+
+'\n'.output
+
+(i.is_same_instance(ob)).output
+(b.is_same_instance(ob)).output
+(f.is_same_instance(ob)).output
+
+'\n'.output
+'\n'.output
+
+(ni.is_same_instance(b)).output
+(nb.is_same_instance(b)).output
+(nf.is_same_instance(b)).output
+
+'\n'.output
+
+(ni.is_same_instance(nb)).output
+(nb.is_same_instance(nb)).output
+(nf.is_same_instance(nb)).output
+
+'\n'.output
+
+(ni.is_same_instance(ob)).output
+(nb.is_same_instance(ob)).output
+(nf.is_same_instance(ob)).output
+
+'\n'.output
+'\n'.output
+
+(oi.is_same_instance(b)).output
+(ob.is_same_instance(b)).output
+(of.is_same_instance(b)).output
+
+'\n'.output
+
+(oi.is_same_instance(nb)).output
+(ob.is_same_instance(nb)).output
+(of.is_same_instance(nb)).output
+
+'\n'.output
+
+(oi.is_same_instance(ob)).output
+(ob.is_same_instance(ob)).output
+(of.is_same_instance(ob)).output
+
+'\n'.output
+'\n'.output
+'\n'.output
+
+(i.is_same_instance(f)).output
+(b.is_same_instance(f)).output
+(f.is_same_instance(f)).output
+
+'\n'.output
+
+(i.is_same_instance(nf)).output
+(b.is_same_instance(nf)).output
+(f.is_same_instance(nf)).output
+
+'\n'.output
+
+(i.is_same_instance(of)).output
+(b.is_same_instance(of)).output
+(f.is_same_instance(of)).output
+
+'\n'.output
+'\n'.output
+
+(ni.is_same_instance(f)).output
+(nb.is_same_instance(f)).output
+(nf.is_same_instance(f)).output
+
+'\n'.output
+
+(ni.is_same_instance(nf)).output
+(nb.is_same_instance(nf)).output
+(nf.is_same_instance(nf)).output
+
+'\n'.output
+
+(ni.is_same_instance(of)).output
+(nb.is_same_instance(of)).output
+(nf.is_same_instance(of)).output
+
+'\n'.output
+'\n'.output
+
+(oi.is_same_instance(f)).output
+(ob.is_same_instance(f)).output
+(of.is_same_instance(f)).output
+
+'\n'.output
+
+(oi.is_same_instance(nf)).output
+(ob.is_same_instance(nf)).output
+(of.is_same_instance(nf)).output
+
+'\n'.output
+
+(oi.is_same_instance(of)).output
+(ob.is_same_instance(of)).output
+(of.is_same_instance(of)).output