--- /dev/null
+# 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 t = true
+var f = false
+
+f.output
+t.output
+
+'\n'.output
+
+(not f).output
+(not t).output
+
+'\n'.output
+
+(f and f).output
+(f and t).output
+(t and f).output
+(t and t).output
+
+'\n'.output
+
+(f or f).output
+(f or t).output
+(t or f).output
+(t or t).output
+
+'\n'.output
+
+(f implies f).output
+(f implies t).output
+(t implies f).output
+(t implies t).output