Allow dynamic types only in some contexts

core/descriptors/src/org/jetbrains/jet/lang/types/dynamicTypes.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * 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.
+ */
+
+package org.jetbrains.jet.lang.types
+
+import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns
+
+open class DynamicTypesSettings {
+    open val dynamicTypesAllowed: Boolean
+        get() = false
+}
+
+class DynamicTypesAllowed: DynamicTypesSettings() {
+    override val dynamicTypesAllowed: Boolean
+        get() = true
+}
+
+object DynamicType : DelegatingFlexibleType(
+        KotlinBuiltIns.getInstance().getNothingType(),
+        KotlinBuiltIns.getInstance().getNullableAnyType(),
+        FlexibleTypeCapabilities.NONE
+) {
+    override fun getDelegate() = upperBound
+}