Try with nonexperimental compiler

Author: odersky

community-build/src/scala/dotty/communitybuild/projects.scala

@@ -11,6 +11,7 @@ lazy val compilerVersion: String =
   new String(Files.readAllBytes(file), UTF_8)
 
 lazy val compilerSupportExperimental: Boolean =
+  true ||
   compilerVersion.contains("SNAPSHOT") || compilerVersion.contains("NIGHTLY")
 
 lazy val sbtPluginFilePath: String =

compiler/src/dotty/tools/dotc/config/Properties.scala

@@ -88,7 +88,9 @@ trait PropertiesTrait {
    *  2. Features supported by experimental versions of the compiler:
    *     - research plugins
    */
-  val experimental: Boolean = versionString.contains("SNAPSHOT") || versionString.contains("NIGHTLY")
+  val experimental: Boolean =
+    true ||
+    versionString.contains("SNAPSHOT") || versionString.contains("NIGHTLY")
 
   val copyrightString: String       = scalaPropOrElse("copyright.string", "(c) 2002-2017 LAMP/EPFL")