--- /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 d1: Discrete = 1
+var d2: Discrete = 2
+var c1: Discrete = 'a'
+var c2: Discrete = 'b'
+(1<2).output
+(d1<2).output
+#alt1#(c1<2).output
+#alt2#(1<d2).output
+(d1<d2).output
+#alt3#(c1<d2).output
+#alt4#(1<c2).output
+#alt5#(d1<c2).output
+(c1<c2).output