Check for java8.

Author: DarkDimius

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

@@ -116,7 +116,7 @@ object CompilerCommand extends DotClass {
       ctx.echo(versionMsg)
       Nil
     } else if (!Properties.isJavaAtLeast("1.8")) {
-      ctx.error("Dotty requires Java 8 or newer to run")
+      ctx.error("Dotty requires Java 8 to run")
       Nil
     }
     else if (shouldStopWithInfo) {

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

@@ -128,9 +128,10 @@ trait PropertiesTrait {
    */
   def isJavaAtLeast(version: String) = {
     val okVersions = version match {
-      case "1.5"    => List("1.5", "1.6", "1.7")
-      case "1.6"    => List("1.6", "1.7")
-      case "1.7"    => List("1.7")
+      case "1.5"    => List("1.5", "1.6", "1.7", "1.8")
+      case "1.6"    => List("1.6", "1.7", "1.8")
+      case "1.7"    => List("1.7", "1.8")
+      case "1.8"    => List("1.8")
       case _        => Nil
     }
     okVersions exists (javaVersion startsWith _)