Merge pull request #312 from lrytz/nowarn

Add scala.annotation.nowarn for cross-compiling

compat/src/main/scala-2.11_2.12/scala/annotation/nowarn.scala

@@ -0,0 +1,22 @@
+/*
+ * Scala (https://www.scala-lang.org)
+ *
+ * Copyright EPFL and Lightbend, Inc.
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ *
+ * See the NOTICE file distributed with this work for
+ * additional information regarding copyright ownership.
+ */
+
+package scala.annotation
+
+/** An annotation for local warning suppression added in 2.13.2. Note that this annotation has
+ * no functionality when used in Scala 2.11 or 2.12, but allows cross-compiling code that uses
+ * `@nowarn`.
+ *
+ * For documentation on how to use the annotation in 2.13 see
+ * https://www.scala-lang.org/api/2.13.2/scala/nowarn.html
+ */
+class nowarn(value: String = "") extends StaticAnnotation