Sample documenting the expected mismatch fixed by the previous 2 comm…

…its.

I suspect that our prototype checker's behavior for such mismatches is
fixed by typetools/checker-framework#4844

samples/OutOfBoundsTypeVariable.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2020 The jspecify Authors.
+ *
+ * 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 org.jspecify.nullness.NullMarked;
+import org.jspecify.nullness.Nullable;
+
+@NullMarked
+class OutOfBoundsTypeVariable {
+  interface User<F extends @Nullable Foo> {
+    // jspecify_nullness_mismatch
+    Lib<F> get();
+  }
+
+  interface Foo {}
+
+  interface Lib<T> {}
+}