+# 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 standard::kernel
+
+class G[E]
+end
+
+class A
+ fun foo(t: T): Comparable do return t
+ #fun foog: nullable G[T] do return barg
+ type T: Comparable #alt1-5#
+ type GT: G[T]
+ #alt1#type T: T
+ #alt2#type T: nullable T
+ #alt3#type T: G[T]
+ #alt4#type T: U
+ #alt4#type U: FAIL
+ #alt5#type T: U
+ #alt5#type U: T
+ fun bar(t: T): Comparable do return t
+ #fun barg: nullable G[T] do return foog
+end
+
+class B
+ super A
+ redef fun foo(t: T): T do return t
+ #redef fun foog: GT do return barg
+ redef type GT: G[Discrete]
+ #alt6#redef type GT: G[Bool]
+ redef fun bar(t: T): T do return t
+ #redef fun barg: GT do return foog
+end
+
+var a = new A
+a.foo(1)
+a.bar('1')
+
+var b = new B
+b.foo(2)
+b.bar('3')