Revert "Try with nonexperimental compiler"

This reverts commit 5d6c42c.

Author: odersky

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

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

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

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