Raise deprecation level to ERROR of coroutineContext

inside kotlin.coroutines.experimental.intrinsics package
 #KT-22400

libraries/stdlib/src/kotlin/coroutines/experimental/intrinsics/Intrinsics.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2017 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.
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
  */
 
 @file:kotlin.jvm.JvmName("IntrinsicsKt")
@@ -76,7 +65,7 @@ public inline fun <T> Continuation<T>.intercepted(): Continuation<T> =
 @Deprecated(
     "Use kotlin.coroutines.experimental.coroutineContext instead",
     ReplaceWith("kotlin.coroutines.experimental.coroutineContext"),
-    DeprecationLevel.WARNING
+    DeprecationLevel.ERROR
 )
 public suspend inline val coroutineContext: CoroutineContext
     get() {