Merge remote-tracking branch 'origin/2.11.x' into merge/2.11.x-to-2.12.x

19 files changed, 200 insertions, 64 deletions

diff --git a/src/compiler/scala/tools/nsc/settings/AbsScalaSettings.scala b/src/compiler/scala/tools/nsc/settings/AbsScalaSettings.scala
index 8b897b83b2..38a7525862 100644
--- a/src/compiler/scala/tools/nsc/settings/AbsScalaSettings.scala
+++ b/src/compiler/scala/tools/nsc/settings/AbsScalaSettings.scala
@@ -16,6 +16,7 @@ trait AbsScalaSettings {
   type ChoiceSetting      <: Setting { type T = String }
   type IntSetting         <: Setting { type T = Int }
   type MultiStringSetting <: Setting { type T = List[String] }
+  type MultiChoiceSetting <: Setting { type T = List[String] }
   type PathSetting        <: Setting { type T = String }
   type PhasesSetting      <: Setting { type T = List[String] }
   type StringSetting      <: Setting { type T = String }
@@ -28,6 +29,7 @@ trait AbsScalaSettings {
   def ChoiceSetting(name: String, helpArg: String, descr: String, choices: List[String], default: String): ChoiceSetting
   def IntSetting(name: String, descr: String, default: Int, range: Option[(Int, Int)], parser: String => Option[Int]): IntSetting
   def MultiStringSetting(name: String, helpArg: String, descr: String): MultiStringSetting
+  def MultiChoiceSetting(name: String, helpArg: String, descr: String, choices: List[String]): MultiChoiceSetting
   def OutputSetting(outputDirs: OutputDirs, default: String): OutputSetting
   def PathSetting(name: String, descr: String, default: String): PathSetting
   def PhasesSetting(name: String, descr: String, default: String): PhasesSetting
diff --git a/src/compiler/scala/tools/nsc/settings/MutableSettings.scala b/src/compiler/scala/tools/nsc/settings/MutableSettings.scala
index 3590254128..54e444decf 100644
--- a/src/compiler/scala/tools/nsc/settings/MutableSettings.scala
+++ b/src/compiler/scala/tools/nsc/settings/MutableSettings.scala
@@ -211,6 +211,11 @@ class MutableSettings(val errorFn: String => Unit)
     add(new ChoiceSetting(name, helpArg, descr, choices, default))
   def IntSetting(name: String, descr: String, default: Int, range: Option[(Int, Int)], parser: String => Option[Int]) = add(new IntSetting(name, descr, default, range, parser))
   def MultiStringSetting(name: String, arg: String, descr: String) = add(new MultiStringSetting(name, arg, descr))
+  def MultiChoiceSetting(name: String, helpArg: String, descr: String, choices: List[String]): MultiChoiceSetting = {
+    val fullChoix = choices.mkString(": ", ",", ".")
+    val fullDescr = s"$descr$fullChoix"
+    add(new MultiChoiceSetting(name, helpArg, fullDescr, choices))
+  }
   def OutputSetting(outputDirs: OutputDirs, default: String) = add(new OutputSetting(outputDirs, default))
   def PhasesSetting(name: String, descr: String, default: String = "") = add(new PhasesSetting(name, descr, default))
   def StringSetting(name: String, arg: String, descr: String, default: String) = add(new StringSetting(name, arg, descr, default))
@@ -548,8 +553,16 @@ class MutableSettings(val errorFn: String => Unit)
       }
   }
 
+  class MultiChoiceSetting private[nsc](
+    name: String,
+    arg: String,
+    descr: String,
+    override val choices: List[String])
+  extends MultiStringSetting(name, arg, descr)
+
   /** A setting that accumulates all strings supplied to it,
-   *  until it encounters one starting with a '-'. */
+   *  until it encounters one starting with a '-'.
+   */
   class MultiStringSetting private[nsc](
     name: String,
     val arg: String,
@@ -558,11 +571,15 @@ class MutableSettings(val errorFn: String => Unit)
     type T = List[String]
     protected var v: T = Nil
     def appendToValue(str: String) { value ++= List(str) }
+    def badChoice(s: String, n: String) = errorFn(s"'$s' is not a valid choice for '$name'")
 
     def tryToSet(args: List[String]) = {
       val (strings, rest) = args span (x => !x.startsWith("-"))
-      strings foreach appendToValue
-
+      strings foreach {
+        case "_" if choices.nonEmpty => choices foreach appendToValue
+        case s if choices.isEmpty || (choices contains s) => appendToValue(s)
+        case s => badChoice(s, name)
+      }
       Some(rest)
     }
     override def tryToSetColon(args: List[String]) = tryToSet(args)
@@ -570,6 +587,8 @@ class MutableSettings(val errorFn: String => Unit)
     def clear(): Unit = (v = Nil)
     def unparse: List[String] = value map (name + ":" + _)
 
+    def contains(s: String) = value contains s
+
     withHelpSyntax(name + ":<" + arg + ">")
   }
 
diff --git a/src/compiler/scala/tools/nsc/settings/ScalaSettings.scala b/src/compiler/scala/tools/nsc/settings/ScalaSettings.scala
index a643a08614..20ccc30ff6 100644
--- a/src/compiler/scala/tools/nsc/settings/ScalaSettings.scala
+++ b/src/compiler/scala/tools/nsc/settings/ScalaSettings.scala
@@ -62,8 +62,14 @@ trait ScalaSettings extends AbsScalaSettings
   /*val argfiles = */ BooleanSetting    ("@<file>", "A text file containing compiler arguments (options and source files)")
   val classpath     = PathSetting       ("-classpath", "Specify where to find user class files.", defaultClasspath) withAbbreviation "-cp"
   val d             = OutputSetting     (outputDirs, ".")
-  val nospecialization = BooleanSetting    ("-no-specialization", "Ignore @specialize annotations.")
-  val language      = MultiStringSetting("-language", "feature", "Enable one or more language features.")
+  val nospecialization = BooleanSetting ("-no-specialization", "Ignore @specialize annotations.")
+
+  // Would be nice to build this dynamically from scala.languageFeature.
+  // The two requirements: delay error checking until you have symbols, and let compiler command build option-specific help.
+  val language      = {
+    val features = List("dynamics", "postfixOps", "reflectiveCalls", "implicitConversions", "higherKinds", "existentials", "experimental.macros")
+    MultiChoiceSetting("-language", "feature", "Enable one or more language features", features)
+  }
 
   /*
    * The previous "-source" option is intended to be used mainly
diff --git a/src/compiler/scala/tools/nsc/transform/Mixin.scala b/src/compiler/scala/tools/nsc/transform/Mixin.scala
index 673bc04bd9..33e8e47c76 100644
--- a/src/compiler/scala/tools/nsc/transform/Mixin.scala
+++ b/src/compiler/scala/tools/nsc/transform/Mixin.scala
@@ -1004,24 +1004,56 @@ abstract class Mixin extends InfoTransform with ast.TreeDSL {
       buildBitmapOffsets()
       var stats1 = addCheckedGetters(clazz, stats)
 
-      def accessedReference(sym: Symbol) = sym.tpe match {
-        case MethodType(Nil, ConstantType(c)) => Literal(c)
-        case _ =>
-          // if it is a mixed-in lazy value, complete the accessor
-          if (sym.isLazy && sym.isGetter) {
-            val isUnit    = sym.tpe.resultType.typeSymbol == UnitClass
-            val initCall  = Apply(staticRef(initializer(sym)), gen.mkAttributedThis(clazz) :: Nil)
-            val selection = Select(This(clazz), sym.accessed)
-            val init      = if (isUnit) initCall else atPos(sym.pos)(Assign(selection, initCall))
-            val returns   = if (isUnit) UNIT else selection
-
-            mkLazyDef(clazz, sym, List(init), returns, fieldOffset(sym))
-          }
-          else sym.getter(sym.owner).tpe.resultType.typeSymbol match {
-            case UnitClass  => UNIT
-            case _          => Select(This(clazz), sym.accessed)
-          }
+      def getterBody(getter: Symbol) = {
+        assert(getter.isGetter)
+        val readValue = getter.tpe match {
+          // A field "final val f = const" in a trait generates a getter with a ConstantType.
+          case MethodType(Nil, ConstantType(c)) =>
+            Literal(c)
+          case _ =>
+            // if it is a mixed-in lazy value, complete the accessor
+            if (getter.isLazy) {
+              val isUnit    = isUnitGetter(getter)
+              val initCall  = Apply(staticRef(initializer(getter)), gen.mkAttributedThis(clazz) :: Nil)
+              val selection = fieldAccess(getter)
+              val init      = if (isUnit) initCall else atPos(getter.pos)(Assign(selection, initCall))
+              val returns   = if (isUnit) UNIT else selection
+              mkLazyDef(clazz, getter, List(init), returns, fieldOffset(getter))
+            }
+            // For a field of type Unit in a trait, no actual field is generated when being mixed in.
+            else if (isUnitGetter(getter)) UNIT
+            else fieldAccess(getter)
+        }
+        if (!needsInitFlag(getter)) readValue
+        else mkCheckedAccessor(clazz, readValue, fieldOffset(getter), getter.pos, getter)
+      }
+
+      def setterBody(setter: Symbol) = {
+        val getter = setter.getterIn(clazz)
+
+        // A trait with a field of type Unit creates a trait setter (invoked by the
+        // implementation class constructor), like for any other trait field.
+        // However, no actual field is created in the class that mixes in the trait.
+        // Therefore the setter does nothing (except setting the -Xcheckinit flag).
+
+        val setInitFlag =
+          if (!needsInitFlag(getter)) Nil
+          else List(mkSetFlag(clazz, fieldOffset(getter), getter, bitmapKind(getter)))
+
+        val fieldInitializer =
+          if (isUnitGetter(getter)) Nil
+          else List(Assign(fieldAccess(setter), Ident(setter.firstParam)))
+
+        (fieldInitializer ::: setInitFlag) match {
+          case Nil => UNIT
+          // If there's only one statement, the Block factory does not actually create a Block.
+          case stats => Block(stats: _*)
+        }
       }
+
+      def isUnitGetter(getter: Symbol) = getter.tpe.resultType.typeSymbol == UnitClass
+      def fieldAccess(accessor: Symbol) = Select(This(clazz), accessor.accessed)
+
       def isOverriddenSetter(sym: Symbol) =
         nme.isTraitSetterName(sym.name) && {
           val other = sym.nextOverriddenSymbol
@@ -1036,27 +1068,17 @@ abstract class Mixin extends InfoTransform with ast.TreeDSL {
         }
         // if class is not a trait add accessor definitions
         else if (!clazz.isTrait) {
-          // This needs to be a def to avoid sharing trees
-          def accessedRef = accessedReference(sym)
           if (isConcreteAccessor(sym)) {
             // add accessor definitions
             addDefDef(sym, {
               if (sym.isSetter) {
+                // If this is a setter of a mixed-in field which is overridden by another mixin,
+                // the trait setter of the overridden one does not need to do anything - the
+                // trait setter of the overriding field will initialize the field.
                 if (isOverriddenSetter(sym)) UNIT
-                else accessedRef match {
-                  case ref @ Literal(_) => ref
-                  case ref =>
-                    val init   = Assign(ref, Ident(sym.firstParam))
-                    val getter = sym.getter(clazz)
-
-                    if (!needsInitFlag(getter)) init
-                    else Block(init, mkSetFlag(clazz, fieldOffset(getter), getter, bitmapKind(getter)), UNIT)
-                }
+                else setterBody(sym)
               }
-              else if (needsInitFlag(sym))
-                mkCheckedAccessor(clazz, accessedRef, fieldOffset(sym), sym.pos, sym)
-              else
-                accessedRef
+              else getterBody(sym)
             })
           }
           else if (sym.isModule && !(sym hasFlag LIFTED | BRIDGE)) {
diff --git a/src/compiler/scala/tools/nsc/typechecker/Typers.scala b/src/compiler/scala/tools/nsc/typechecker/Typers.scala
index 3690750e42..bf98c0e3dc 100644
--- a/src/compiler/scala/tools/nsc/typechecker/Typers.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/Typers.scala
@@ -741,7 +741,7 @@ trait Typers extends Adaptations with Tags with TypersTracking with PatternTyper
         val featureName = (nestedOwners map (_.name + ".")).mkString + featureTrait.name
         def action(): Boolean = {
           def hasImport = inferImplicit(EmptyTree: Tree, featureTrait.tpe, reportAmbiguous = true, isView = false, context).isSuccess
-          def hasOption = settings.language.value exists (s => s == featureName || s == "_")
+          def hasOption = settings.language contains featureName
           val OK = hasImport || hasOption
           if (!OK) {
             val Some(AnnotationInfo(_, List(Literal(Constant(featureDesc: String)), Literal(Constant(required: Boolean))), _)) =
diff --git a/test/files/run/t3569.scala b/test/files/run/t3569.scala
index 91d437e0e3..eb3b424439 100644
--- a/test/files/run/t3569.scala
+++ b/test/files/run/t3569.scala
@@ -26,7 +26,8 @@ object Test {
     s.x += 1
     println(s.x)
 
-    (classOf[X].getDeclaredFields map ("" + _)).sorted foreach println
+    // under -Xcheckinit there's an additional $init$ field
+    (classOf[X].getDeclaredFields map ("" + _)).sorted.filter(_ != "private volatile byte Test$X.bitmap$init$0") foreach println
     (classOf[Y].getDeclaredFields map ("" + _)).sorted foreach println
   }
 }
diff --git a/test/files/run/t5256h.scala b/test/files/run/t5256h.scala
index f58aa6dbe7..435124a469 100644
--- a/test/files/run/t5256h.scala
+++ b/test/files/run/t5256h.scala
@@ -6,5 +6,6 @@ object Test extends App {
   val c = cm.classSymbol(mutant.getClass)
   println(c)
   println(c.fullName)
-  println(c.info)
+  // under -Xcheckinit there's an additional $init$ field
+  c.info.toString.lines.filter(_ != "  private var bitmap$init$0: Boolean") foreach println
 }
diff --git a/test/files/run/t5905-features.flags b/test/files/run/t5905-features.flags
new file mode 100644
index 0000000000..ad51758c39
--- /dev/null
+++ b/test/files/run/t5905-features.flags
@@ -0,0 +1 @@
+-nowarn
diff --git a/test/files/run/t5905-features.scala b/test/files/run/t5905-features.scala
new file mode 100644
index 0000000000..a3848eef2a
--- /dev/null
+++ b/test/files/run/t5905-features.scala
@@ -0,0 +1,29 @@
+
+import tools.partest.DirectTest
+
+// verify that all languageFeature names are accepted by -language
+object Test extends DirectTest {
+  override def code = "class Code { def f = (1 to 10) size }" // exercise a feature
+
+  override def extraSettings = s"-usejavacp -d ${testOutput.path}"
+
+  override def show() = {
+    val global = newCompiler("-language:postfixOps", "-Ystop-after:typer")
+    compileString(global)(code)
+    import global._
+    exitingTyper {
+      //def isFeature(s: Symbol) = s.annotations.exists((a: AnnotationInfo) => a.tpe <:< typeOf[scala.annotation.meta.languageFeature])
+      def isFeature(s: Symbol) = s hasAnnotation definitions.LanguageFeatureAnnot
+      val langf  = definitions.languageFeatureModule.typeSignature
+      val feats  = langf.declarations filter (s => isFeature(s)) map (_.name.decoded)
+      val xmen   = langf.member(TermName("experimental")).typeSignature.declarations filter (s => isFeature(s)) map (s => s"experimental.${s.name.decoded}")
+      val all    = (feats ++ xmen) mkString ","
+
+      assert(feats.nonEmpty, "Test must find feature flags.")
+
+      //dynamics,postfixOps,reflectiveCalls,implicitConversions,higherKinds,existentials,experimental.macros
+      compile(s"-language:$all")
+    }
+  }
+}
+
diff --git a/test/files/run/t5905b-features.check b/test/files/run/t5905b-features.check
new file mode 100644
index 0000000000..08c76d74aa
--- /dev/null
+++ b/test/files/run/t5905b-features.check
@@ -0,0 +1 @@
+'noob' is not a valid choice for '-language'
diff --git a/test/files/run/t5905b-features.scala b/test/files/run/t5905b-features.scala
new file mode 100644
index 0000000000..627df8334b
--- /dev/null
+++ b/test/files/run/t5905b-features.scala
@@ -0,0 +1,15 @@
+
+import tools.partest.DirectTest
+
+// verify that only languageFeature names are accepted by -language
+object Test extends DirectTest {
+  override def code = "class Code"
+
+  override def extraSettings = s"-usejavacp -d ${testOutput.path}"
+
+  override def show() = {
+    //compile("-language", "--")  // no error
+    compile(s"-language:noob")
+  }
+}
+
diff --git a/test/files/run/t7974.flags b/test/files/run/t7974.flags
new file mode 100644
index 0000000000..5fc2a03894
--- /dev/null
+++ b/test/files/run/t7974.flags
@@ -0,0 +1 @@
+-Xcheckinit:false
diff --git a/test/files/run/t7974/Test.scala b/test/files/run/t7974/Test.scala
index 9403ea332b..433d9061a7 100644
--- a/test/files/run/t7974/Test.scala
+++ b/test/files/run/t7974/Test.scala
@@ -9,7 +9,7 @@ object Test extends BytecodeTest {
     val classNode = loadClassNode("Symbols", skipDebugInfo = false)
     val textifier = new Textifier
     classNode.accept(new TraceClassVisitor(null, textifier, null))
-    
+
     val classString = stringFromWriter(w => textifier.print(w))
     val result =
       classString.split('\n')
diff --git a/test/files/run/t8549.scala b/test/files/run/t8549.scala
index 1b402d2d22..d3355208fa 100644
--- a/test/files/run/t8549.scala
+++ b/test/files/run/t8549.scala
@@ -85,13 +85,9 @@ object Test extends App {
   check(List(1, 2, 3))( "rO0ABXNyADJzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5MaXN0JFNlcmlhbGl6YXRpb25Qcm94eQAAAAAAAAABAwAAeHBzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4AAgAAAAJzcQB+AAIAAAADc3IALHNjYWxhLmNvbGxlY3Rpb24uaW1tdXRhYmxlLkxpc3RTZXJpYWxpemVFbmQkilxjW/dTC20CAAB4cHg=")
   check(Nil)(           "rO0ABXNyADJzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5MaXN0JFNlcmlhbGl6YXRpb25Qcm94eQAAAAAAAAABAwAAeHBzcgAsc2NhbGEuY29sbGVjdGlvbi5pbW11dGFibGUuTGlzdFNlcmlhbGl6ZUVuZCSKXGNb91MLbQIAAHhweA==")
 
-  check(Vector(1))(     "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")
-  check(Vector())(      "rO0ABXNyACFzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5WZWN0b3Lkd3dcHq6PXAIAC0kABWRlcHRoWgAFZGlydHlJAAhlbmRJbmRleEkABWZvY3VzSQAKc3RhcnRJbmRleFsACGRpc3BsYXkwdAATW0xqYXZhL2xhbmcvT2JqZWN0O1sACGRpc3BsYXkxcQB+AAFbAAhkaXNwbGF5MnEAfgABWwAIZGlzcGxheTNxAH4AAVsACGRpc3BsYXk0cQB+AAFbAAhkaXNwbGF5NXEAfgABeHAAAAAAAAAAAAAAAAAAAAAAAHBwcHBwcA==")
-
-  object Enum extends Enumeration {
-    val V1 = new Value { def id = 42 }
-    val V2 = new Val(42)
-  }
+  // TODO SI-8576 unstable under -Xcheckinit
+  // check(Vector(1))(     "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")
+  // check(Vector())(      "rO0ABXNyACFzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5WZWN0b3Lkd3dcHq6PXAIAC0kABWRlcHRoWgAFZGlydHlJAAhlbmRJbmRleEkABWZvY3VzSQAKc3RhcnRJbmRleFsACGRpc3BsYXkwdAATW0xqYXZhL2xhbmcvT2JqZWN0O1sACGRpc3BsYXkxcQB+AAFbAAhkaXNwbGF5MnEAfgABWwAIZGlzcGxheTNxAH4AAVsACGRpc3BsYXk0cQB+AAFbAAhkaXNwbGF5NXEAfgABeHAAAAAAAAAAAAAAAAAAAAAAAHBwcHBwcA==")
 
   import collection.{ mutable, immutable }
 
@@ -101,16 +97,20 @@ object Test extends App {
   check(reflect.classTag[String])("rO0ABXNyAB5zY2FsYS5yZWZsZWN0LkNsYXNzVGFnJCRhbm9uJDG7ePPrmQBkhgIAAUwAD3J1bnRpbWVDbGFzczEkMXQAEUxqYXZhL2xhbmcvQ2xhc3M7eHB2cgAQamF2YS5sYW5nLlN0cmluZ6DwpDh6O7NCAgAAeHA=")
   check(reflect.classTag[Object])("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")
 
-  check(Enum)(         "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")
-  check(Enum.V1)(      "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")
-  check(Enum.V2)(      "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")
+  // TODO SI-8576 unstable under -Xcheckinit
+  // check(Enum)(         "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")
+  // check(Enum.V1)(      "rO0ABXNyABFUZXN0JEVudW0kJGFub24kMVlIjlmE1sXaAgAAeHIAF3NjYWxhLkVudW1lcmF0aW9uJFZhbHVlYml8L+0hHVECAAJMAAYkb3V0ZXJ0ABNMc2NhbGEvRW51bWVyYXRpb247TAAcc2NhbGEkRW51bWVyYXRpb24kJG91dGVyRW51bXEAfgACeHBzcgAKVGVzdCRFbnVtJHrQiMkPAttzAgACTAACVjF0ABlMc2NhbGEvRW51bWVyYXRpb24kVmFsdWU7TAACVjJ0ABdMc2NhbGEvRW51bWVyYXRpb24kVmFsO3hyABFzY2FsYS5FbnVtZXJhdGlvbnWgzd2YDlmOAgAISQAGbmV4dElkSQAbc2NhbGEkRW51bWVyYXRpb24kJGJvdHRvbUlkSQAYc2NhbGEkRW51bWVyYXRpb24kJHRvcElkTAAUVmFsdWVPcmRlcmluZyRtb2R1bGV0ACJMc2NhbGEvRW51bWVyYXRpb24kVmFsdWVPcmRlcmluZyQ7TAAPVmFsdWVTZXQkbW9kdWxldAAdTHNjYWxhL0VudW1lcmF0aW9uJFZhbHVlU2V0JDtMAAhuZXh0TmFtZXQAG0xzY2FsYS9jb2xsZWN0aW9uL0l0ZXJhdG9yO0wAF3NjYWxhJEVudW1lcmF0aW9uJCRubWFwdAAeTHNjYWxhL2NvbGxlY3Rpb24vbXV0YWJsZS9NYXA7TAAXc2NhbGEkRW51bWVyYXRpb24kJHZtYXBxAH4AC3hwAAAAKwAAAAAAAAArcHBwc3IAIHNjYWxhLmNvbGxlY3Rpb24ubXV0YWJsZS5IYXNoTWFwAAAAAAAAAAEDAAB4cHcNAAAC7gAAAAAAAAAEAHhzcQB+AA13DQAAAu4AAAABAAAABABzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAKnNyABVzY2FsYS5FbnVtZXJhdGlvbiRWYWzPaWevyfztTwIAAkkAGHNjYWxhJEVudW1lcmF0aW9uJFZhbCQkaUwABG5hbWV0ABJMamF2YS9sYW5nL1N0cmluZzt4cQB+AAFxAH4ADHEAfgAMAAAAKnB4cQB+AANxAH4AFXEAfgAM")
+  // check(Enum.V2)(      "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")
 
   // IndexedSeqLike#Elements
-  check(new immutable.Range(0, 1, 1).iterator)("rO0ABXNyAChzY2FsYS5jb2xsZWN0aW9uLkluZGV4ZWRTZXFMaWtlJEVsZW1lbnRzGF+1cBwmcx0CAANJAANlbmRJAAVpbmRleEwABiRvdXRlcnQAIUxzY2FsYS9jb2xsZWN0aW9uL0luZGV4ZWRTZXFMaWtlO3hwAAAAAQAAAABzcgAgc2NhbGEuY29sbGVjdGlvbi5pbW11dGFibGUuUmFuZ2Vpu6NUqxUyDQIAB0kAA2VuZFoAB2lzRW1wdHlJAAtsYXN0RWxlbWVudEkAEG51bVJhbmdlRWxlbWVudHNJAAVzdGFydEkABHN0ZXBJAA90ZXJtaW5hbEVsZW1lbnR4cAAAAAEAAAAAAAAAAAEAAAAAAAAAAQAAAAE="
-    , _.toList)
+  // TODO SI-8576 throws scala.UnitializedFieldError under -Xcheckinit
+  // check(new immutable.Range(0, 1, 1).iterator)("rO0ABXNyAChzY2FsYS5jb2xsZWN0aW9uLkluZGV4ZWRTZXFMaWtlJEVsZW1lbnRzGF+1cBwmcx0CAANJAANlbmRJAAVpbmRleEwABiRvdXRlcnQAIUxzY2FsYS9jb2xsZWN0aW9uL0luZGV4ZWRTZXFMaWtlO3hwAAAAAQAAAABzcgAgc2NhbGEuY29sbGVjdGlvbi5pbW11dGFibGUuUmFuZ2Vpu6NUqxUyDQIAB0kAA2VuZFoAB2lzRW1wdHlJAAtsYXN0RWxlbWVudEkAEG51bVJhbmdlRWxlbWVudHNJAAVzdGFydEkABHN0ZXBJAA90ZXJtaW5hbEVsZW1lbnR4cAAAAAEAAAAAAAAAAAEAAAAAAAAAAQAAAAE="
+  //   , _.toList)
 
-  check(new collection.concurrent.TrieMap[Any, Any]())( "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")
+  // check(new collection.concurrent.TrieMap[Any, Any]())( "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")
   // not sure why this one needs stable serialization.
+
+  // TODO SI-8576 unstable under -Xcheckinit
   check(collection.convert.Wrappers)( "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")
 
   check(immutable.BitSet(1, 2, 3))( "rO0ABXNyAClzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5CaXRTZXQkQml0U2V0MR9dg8JGRI8UAgABSgAFZWxlbXN4cgAhc2NhbGEuY29sbGVjdGlvbi5pbW11dGFibGUuQml0U2V0Flz5Ms3qxsoCAAB4cAAAAAAAAAAO")
@@ -130,7 +130,8 @@ object Test extends App {
   check(immutable.Queue())(         "rO0ABXNyACBzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5RdWV1ZZY146W3qSuhAgACTAACaW50ACFMc2NhbGEvY29sbGVjdGlvbi9pbW11dGFibGUvTGlzdDtMAANvdXRxAH4AAXhwc3IAMnNjYWxhLmNvbGxlY3Rpb24uaW1tdXRhYmxlLkxpc3QkU2VyaWFsaXphdGlvblByb3h5AAAAAAAAAAEDAAB4cHNyACxzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5MaXN0U2VyaWFsaXplRW5kJIpcY1v3UwttAgAAeHB4cQB+AAQ=")
   check(immutable.Queue(1, 2, 3))(  "rO0ABXNyACBzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5RdWV1ZZY146W3qSuhAgACTAACaW50ACFMc2NhbGEvY29sbGVjdGlvbi9pbW11dGFibGUvTGlzdDtMAANvdXRxAH4AAXhwc3IAMnNjYWxhLmNvbGxlY3Rpb24uaW1tdXRhYmxlLkxpc3QkU2VyaWFsaXphdGlvblByb3h5AAAAAAAAAAEDAAB4cHNyACxzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5MaXN0U2VyaWFsaXplRW5kJIpcY1v3UwttAgAAeHB4c3EAfgADc3IAEWphdmEubGFuZy5JbnRlZ2VyEuKgpPeBhzgCAAFJAAV2YWx1ZXhyABBqYXZhLmxhbmcuTnVtYmVyhqyVHQuU4IsCAAB4cAAAAAFzcQB+AAgAAAACc3EAfgAIAAAAA3EAfgAGeA==")
 
-  check(new immutable.Range(0, 1, 1))( "rO0ABXNyACBzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5SYW5nZWm7o1SrFTINAgAHSQADZW5kWgAHaXNFbXB0eUkAC2xhc3RFbGVtZW50SQAQbnVtUmFuZ2VFbGVtZW50c0kABXN0YXJ0SQAEc3RlcEkAD3Rlcm1pbmFsRWxlbWVudHhwAAAAAQAAAAAAAAAAAQAAAAAAAAABAAAAAQ==")
+  // TODO SI-8576 throws scala.UnitializedFieldError under -Xcheckinit
+  // check(new immutable.Range(0, 1, 1))( "rO0ABXNyACBzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5SYW5nZWm7o1SrFTINAgAHSQADZW5kWgAHaXNFbXB0eUkAC2xhc3RFbGVtZW50SQAQbnVtUmFuZ2VFbGVtZW50c0kABXN0YXJ0SQAEc3RlcEkAD3Rlcm1pbmFsRWxlbWVudHhwAAAAAQAAAAAAAAAAAQAAAAAAAAABAAAAAQ==")
 
   check(immutable.Set())(              "rO0ABXNyAChzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5TZXQkRW1wdHlTZXQk8Hk3TFN0uDYCAAB4cA==")
   check(immutable.Set(1))(             "rO0ABXNyACNzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5TZXQkU2V0MREd3c4yqtWTAgABTAAFZWxlbTF0ABJMamF2YS9sYW5nL09iamVjdDt4cHNyABFqYXZhLmxhbmcuSW50ZWdlchLioKT3gYc4AgABSQAFdmFsdWV4cgAQamF2YS5sYW5nLk51bWJlcoaslR0LlOCLAgAAeHAAAAAB")
@@ -141,32 +142,42 @@ object Test extends App {
 
   check(immutable.Stack(1, 2, 3))( "rO0ABXNyACBzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5TdGFjaxtt3qEbMvq+AgABTAAFZWxlbXN0ACFMc2NhbGEvY29sbGVjdGlvbi9pbW11dGFibGUvTGlzdDt4cHNyADJzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5MaXN0JFNlcmlhbGl6YXRpb25Qcm94eQAAAAAAAAABAwAAeHBzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4ABQAAAAJzcQB+AAUAAAADc3IALHNjYWxhLmNvbGxlY3Rpb24uaW1tdXRhYmxlLkxpc3RTZXJpYWxpemVFbmQkilxjW/dTC20CAAB4cHg=")
 
-  check(immutable.Stream(1, 2, 3))( "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")
+  // TODO SI-8576 Uninitialized field: IndexedSeqLike.scala: 56
+  // check(immutable.Stream(1, 2, 3))( "rO0ABXNyACZzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5TdHJlYW0kQ29uc/ekjBXM3TlFAgADTAACaGR0ABJMamF2YS9sYW5nL09iamVjdDtMAAV0bEdlbnQAEUxzY2FsYS9GdW5jdGlvbjA7TAAFdGxWYWx0ACNMc2NhbGEvY29sbGVjdGlvbi9pbW11dGFibGUvU3RyZWFtO3hyACFzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5TdHJlYW0552RDntM42gIAAHhwc3IAEWphdmEubGFuZy5JbnRlZ2VyEuKgpPeBhzgCAAFJAAV2YWx1ZXhyABBqYXZhLmxhbmcuTnVtYmVyhqyVHQuU4IsCAAB4cAAAAAFzcgAtc2NhbGEuY29sbGVjdGlvbi5JdGVyYXRvciQkYW5vbmZ1biR0b1N0cmVhbSQxRWR4We0SX0UCAAFMAAYkb3V0ZXJ0ABtMc2NhbGEvY29sbGVjdGlvbi9JdGVyYXRvcjt4cHNyAChzY2FsYS5jb2xsZWN0aW9uLkluZGV4ZWRTZXFMaWtlJEVsZW1lbnRzGF+1cBwmcx0CAANJAANlbmRJAAVpbmRleEwABiRvdXRlcnQAIUxzY2FsYS9jb2xsZWN0aW9uL0luZGV4ZWRTZXFMaWtlO3hwAAAAAwAAAAFzcgArc2NhbGEuY29sbGVjdGlvbi5tdXRhYmxlLldyYXBwZWRBcnJheSRvZkludMmRLBcI15VjAgABWwAFYXJyYXl0AAJbSXhwdXIAAltJTbpgJnbqsqUCAAB4cAAAAAMAAAABAAAAAgAAAANw")
 
   check(immutable.TreeSet[Int]())(   "rO0ABXNyACJzY2FsYS5jb2xsZWN0aW9uLmltbXV0YWJsZS5UcmVlU2V0sRdVIDjbWAsCAAJMAAhvcmRlcmluZ3QAFUxzY2FsYS9tYXRoL09yZGVyaW5nO0wABHRyZWV0AC5Mc2NhbGEvY29sbGVjdGlvbi9pbW11dGFibGUvUmVkQmxhY2tUcmVlJFRyZWU7eHBzcgAYc2NhbGEubWF0aC5PcmRlcmluZyRJbnQkC4BMdr1Z51wCAAB4cHA=")
-  check(immutable.TreeSet(1, 2, 3))( "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")
-
-  check(mutable.ArrayBuffer(1, 2, 3))(      "rO0ABXNyACRzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuQXJyYXlCdWZmZXIVOLBTg4KOcwIAA0kAC2luaXRpYWxTaXplSQAFc2l6ZTBbAAVhcnJheXQAE1tMamF2YS9sYW5nL09iamVjdDt4cAAAABAAAAADdXIAE1tMamF2YS5sYW5nLk9iamVjdDuQzlifEHMpbAIAAHhwAAAAEHNyABFqYXZhLmxhbmcuSW50ZWdlchLioKT3gYc4AgABSQAFdmFsdWV4cgAQamF2YS5sYW5nLk51bWJlcoaslR0LlOCLAgAAeHAAAAABc3EAfgAFAAAAAnNxAH4ABQAAAANwcHBwcHBwcHBwcHBw")
-  check(mutable.ArraySeq(1, 2, 3))(         "rO0ABXNyACFzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuQXJyYXlTZXEVPD3SKEkOcwIAAkkABmxlbmd0aFsABWFycmF5dAATW0xqYXZhL2xhbmcvT2JqZWN0O3hwAAAAA3VyABNbTGphdmEubGFuZy5PYmplY3Q7kM5YnxBzKWwCAAB4cAAAAANzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4ABQAAAAJzcQB+AAUAAAAD")
+  
+  // TODO SI-8576 unstable under -Xcheckinit
+  // check(immutable.TreeSet(1, 2, 3))( "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")
+
+  // TODO SI-8576 Uninitialized field under -Xcheckinit 
+  // check(mutable.ArrayBuffer(1, 2, 3))(      "rO0ABXNyACRzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuQXJyYXlCdWZmZXIVOLBTg4KOcwIAA0kAC2luaXRpYWxTaXplSQAFc2l6ZTBbAAVhcnJheXQAE1tMamF2YS9sYW5nL09iamVjdDt4cAAAABAAAAADdXIAE1tMamF2YS5sYW5nLk9iamVjdDuQzlifEHMpbAIAAHhwAAAAEHNyABFqYXZhLmxhbmcuSW50ZWdlchLioKT3gYc4AgABSQAFdmFsdWV4cgAQamF2YS5sYW5nLk51bWJlcoaslR0LlOCLAgAAeHAAAAABc3EAfgAFAAAAAnNxAH4ABQAAAANwcHBwcHBwcHBwcHBw")
+  // TODO SI-8576 Uninitialized field under -Xcheckinit
+  // check(mutable.ArraySeq(1, 2, 3))(         "rO0ABXNyACFzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuQXJyYXlTZXEVPD3SKEkOcwIAAkkABmxlbmd0aFsABWFycmF5dAATW0xqYXZhL2xhbmcvT2JqZWN0O3hwAAAAA3VyABNbTGphdmEubGFuZy5PYmplY3Q7kM5YnxBzKWwCAAB4cAAAAANzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4ABQAAAAJzcQB+AAUAAAAD")
   check(mutable.ArrayStack(1, 2, 3))(       "rO0ABXNyACNzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuQXJyYXlTdGFja3bdxXbcnLBeAgACSQAqc2NhbGEkY29sbGVjdGlvbiRtdXRhYmxlJEFycmF5U3RhY2skJGluZGV4WwAqc2NhbGEkY29sbGVjdGlvbiRtdXRhYmxlJEFycmF5U3RhY2skJHRhYmxldAATW0xqYXZhL2xhbmcvT2JqZWN0O3hwAAAAA3VyABNbTGphdmEubGFuZy5PYmplY3Q7kM5YnxBzKWwCAAB4cAAAAANzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAA3NxAH4ABQAAAAJzcQB+AAUAAAAB")
   check(mutable.DoubleLinkedList(1, 2, 3))( "rO0ABXNyAClzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuRG91YmxlTGlua2VkTGlzdI73LKsKRr1RAgADTAAEZWxlbXQAEkxqYXZhL2xhbmcvT2JqZWN0O0wABG5leHR0AB5Mc2NhbGEvY29sbGVjdGlvbi9tdXRhYmxlL1NlcTtMAARwcmV2cQB+AAJ4cHNyABFqYXZhLmxhbmcuSW50ZWdlchLioKT3gYc4AgABSQAFdmFsdWV4cgAQamF2YS5sYW5nLk51bWJlcoaslR0LlOCLAgAAeHAAAAABc3EAfgAAc3EAfgAEAAAAAnNxAH4AAHNxAH4ABAAAAANzcQB+AABwcQB+AAtxAH4ACXEAfgAHcQB+AANw")
 
   check(mutable.HashMap())( "rO0ABXNyACBzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuSGFzaE1hcAAAAAAAAAABAwAAeHB3DQAAAu4AAAAAAAAABAB4")
   check(mutable.HashMap(1 -> 1))( "rO0ABXNyACBzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuSGFzaE1hcAAAAAAAAAABAwAAeHB3DQAAAu4AAAABAAAABABzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXEAfgAEeA==")
   check(mutable.HashSet(1, 2, 3))( "rO0ABXNyACBzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuSGFzaFNldAAAAAAAAAABAwAAeHB3DQAAAcIAAAADAAAABQBzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4AAgAAAAJzcQB+AAIAAAADeA==")
-  check(new mutable.History())( "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")
+  // TODO SI-8576 Uninitialized field under -Xcheckinit
+  // check(new mutable.History())( "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")
   check(mutable.LinkedHashMap(1 -> 2))( "rO0ABXNyACZzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuTGlua2VkSGFzaE1hcAAAAAAAAAABAwAAeHB3DQAAAu4AAAABAAAABABzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4AAgAAAAJ4")
   check(mutable.LinkedHashSet(1, 2, 3))( "rO0ABXNyACZzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuTGlua2VkSGFzaFNldAAAAAAAAAABAwAAeHB3DQAAAu4AAAADAAAABABzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4AAgAAAAJzcQB+AAIAAAADeA==")
   check(mutable.LinkedList(1, 2, 3))( "rO0ABXNyACNzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuTGlua2VkTGlzdJqT6cYJkdpRAgACTAAEZWxlbXQAEkxqYXZhL2xhbmcvT2JqZWN0O0wABG5leHR0AB5Mc2NhbGEvY29sbGVjdGlvbi9tdXRhYmxlL1NlcTt4cHNyABFqYXZhLmxhbmcuSW50ZWdlchLioKT3gYc4AgABSQAFdmFsdWV4cgAQamF2YS5sYW5nLk51bWJlcoaslR0LlOCLAgAAeHAAAAABc3EAfgAAc3EAfgAEAAAAAnNxAH4AAHNxAH4ABAAAAANzcQB+AABwcQB+AAs=")
-  check(mutable.ListBuffer(1, 2, 3))( "rO0ABXNyACNzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuTGlzdEJ1ZmZlci9y9I7QyWzGAwAEWgAIZXhwb3J0ZWRJAANsZW5MAAVsYXN0MHQAKUxzY2FsYS9jb2xsZWN0aW9uL2ltbXV0YWJsZS8kY29sb24kY29sb247TAAqc2NhbGEkY29sbGVjdGlvbiRtdXRhYmxlJExpc3RCdWZmZXIkJHN0YXJ0dAAhTHNjYWxhL2NvbGxlY3Rpb24vaW1tdXRhYmxlL0xpc3Q7eHBzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4ABAAAAAJzcQB+AAQAAAADc3IALHNjYWxhLmNvbGxlY3Rpb24uaW1tdXRhYmxlLkxpc3RTZXJpYWxpemVFbmQkilxjW/dTC20CAAB4cHcFAAAAAAN4")
+  
+  // TODO SI-8576 unstable under -Xcheckinit
+  // check(mutable.ListBuffer(1, 2, 3))( "rO0ABXNyACNzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuTGlzdEJ1ZmZlci9y9I7QyWzGAwAEWgAIZXhwb3J0ZWRJAANsZW5MAAVsYXN0MHQAKUxzY2FsYS9jb2xsZWN0aW9uL2ltbXV0YWJsZS8kY29sb24kY29sb247TAAqc2NhbGEkY29sbGVjdGlvbiRtdXRhYmxlJExpc3RCdWZmZXIkJHN0YXJ0dAAhTHNjYWxhL2NvbGxlY3Rpb24vaW1tdXRhYmxlL0xpc3Q7eHBzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4ABAAAAAJzcQB+AAQAAAADc3IALHNjYWxhLmNvbGxlY3Rpb24uaW1tdXRhYmxlLkxpc3RTZXJpYWxpemVFbmQkilxjW/dTC20CAAB4cHcFAAAAAAN4")
   check(new mutable.StringBuilder(new java.lang.StringBuilder("123")))( "rO0ABXNyACZzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuU3RyaW5nQnVpbGRlcomvqgGv1tTxAgABTAAKdW5kZXJseWluZ3QAGUxqYXZhL2xhbmcvU3RyaW5nQnVpbGRlcjt4cHNyABdqYXZhLmxhbmcuU3RyaW5nQnVpbGRlcjzV+xRaTGrLAwAAeHB3BAAAAAN1cgACW0OwJmaw4l2ErAIAAHhwAAAAEwAxADIAMwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAeA==")
   check(mutable.UnrolledBuffer[Int]())( "rO0ABXNyACdzY2FsYS5jb2xsZWN0aW9uLm11dGFibGUuVW5yb2xsZWRCdWZmZXIAAAAAAAAAAQMAAUwAA3RhZ3QAGExzY2FsYS9yZWZsZWN0L0NsYXNzVGFnO3hwc3IAJXNjYWxhLnJlZmxlY3QuTWFuaWZlc3RGYWN0b3J5JCRhbm9uJDnN+aJJU2O1UgIAAHhyABxzY2FsYS5yZWZsZWN0LkFueVZhbE1hbmlmZXN0AAAAAAAAAAECAAFMAAh0b1N0cmluZ3QAEkxqYXZhL2xhbmcvU3RyaW5nO3hwdAADSW50dwQAAAAAeA==")
 
   import collection.parallel
   check(parallel.immutable.ParHashMap(1 -> 2))( "rO0ABXNyAC5zY2FsYS5jb2xsZWN0aW9uLnBhcmFsbGVsLmltbXV0YWJsZS5QYXJIYXNoTWFwAAAAAAAAAAECAANMAA9TY2FuTGVhZiRtb2R1bGV0ADVMc2NhbGEvY29sbGVjdGlvbi9wYXJhbGxlbC9QYXJJdGVyYWJsZUxpa2UkU2NhbkxlYWYkO0wAD1NjYW5Ob2RlJG1vZHVsZXQANUxzY2FsYS9jb2xsZWN0aW9uL3BhcmFsbGVsL1Bhckl0ZXJhYmxlTGlrZSRTY2FuTm9kZSQ7TAAEdHJpZXQAJExzY2FsYS9jb2xsZWN0aW9uL2ltbXV0YWJsZS9IYXNoTWFwO3hwcHBzcgA1c2NhbGEuY29sbGVjdGlvbi5pbW11dGFibGUuSGFzaE1hcCRTZXJpYWxpemF0aW9uUHJveHkAAAAAAAAAAgMAAHhwdwQAAAABc3IAEWphdmEubGFuZy5JbnRlZ2VyEuKgpPeBhzgCAAFJAAV2YWx1ZXhyABBqYXZhLmxhbmcuTnVtYmVyhqyVHQuU4IsCAAB4cAAAAAFzcQB+AAcAAAACeA==")
   check(parallel.immutable.ParHashSet(1, 2, 3))( "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")
-  check(new parallel.immutable.ParRange(new Range(0, 1, 2)))( "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")
-  check(parallel.mutable.ParArray(1, 2, 3))( "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")
+  // TODO SI-8576 Uninitialized field under -Xcheckinit
+  // check(new parallel.immutable.ParRange(new Range(0, 1, 2)))( "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")
+  // TODO SI-8576 unstable under -Xcheckinit
+  // check(parallel.mutable.ParArray(1, 2, 3))( "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")
   check(parallel.mutable.ParHashMap(1 -> 2))( "rO0ABXNyACxzY2FsYS5jb2xsZWN0aW9uLnBhcmFsbGVsLm11dGFibGUuUGFySGFzaE1hcAAAAAAAAAABAwACTAAPU2NhbkxlYWYkbW9kdWxldAA1THNjYWxhL2NvbGxlY3Rpb24vcGFyYWxsZWwvUGFySXRlcmFibGVMaWtlJFNjYW5MZWFmJDtMAA9TY2FuTm9kZSRtb2R1bGV0ADVMc2NhbGEvY29sbGVjdGlvbi9wYXJhbGxlbC9QYXJJdGVyYWJsZUxpa2UkU2Nhbk5vZGUkO3hwcHB3DQAAAu4AAAABAAAABAFzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4ABAAAAAJ4")
   check(parallel.mutable.ParHashSet(1, 2, 3))( "rO0ABXNyACxzY2FsYS5jb2xsZWN0aW9uLnBhcmFsbGVsLm11dGFibGUuUGFySGFzaFNldAAAAAAAAAABAwACTAAPU2NhbkxlYWYkbW9kdWxldAA1THNjYWxhL2NvbGxlY3Rpb24vcGFyYWxsZWwvUGFySXRlcmFibGVMaWtlJFNjYW5MZWFmJDtMAA9TY2FuTm9kZSRtb2R1bGV0ADVMc2NhbGEvY29sbGVjdGlvbi9wYXJhbGxlbC9QYXJJdGVyYWJsZUxpa2UkU2Nhbk5vZGUkO3hwcHB3DQAAAcIAAAADAAAAGwFzcgARamF2YS5sYW5nLkludGVnZXIS4qCk94GHOAIAAUkABXZhbHVleHIAEGphdmEubGFuZy5OdW1iZXKGrJUdC5TgiwIAAHhwAAAAAXNxAH4ABAAAAAJzcQB+AAQAAAADeA==")
 
diff --git a/test/files/run/t8570.flags b/test/files/run/t8570.flags
new file mode 100644
index 0000000000..3d1ee4760a
--- /dev/null
+++ b/test/files/run/t8570.flags
@@ -0,0 +1 @@
+-Xcheckinit
diff --git a/test/files/run/t8570.scala b/test/files/run/t8570.scala
new file mode 100644
index 0000000000..bbe83e9080
--- /dev/null
+++ b/test/files/run/t8570.scala
@@ -0,0 +1,10 @@
+trait Trait40_1 {
+  val value37_2 = ()
+  def run = { value37_2 }
+}
+
+object Test {
+  def main(args: Array[String]) {
+    (new Trait40_1 {}).run
+  }
+}
diff --git a/test/files/run/t8570a.check b/test/files/run/t8570a.check
new file mode 100644
index 0000000000..6a452c185a
--- /dev/null
+++ b/test/files/run/t8570a.check
@@ -0,0 +1 @@
+()
diff --git a/test/files/run/t8570a.flags b/test/files/run/t8570a.flags
new file mode 100644
index 0000000000..3d1ee4760a
--- /dev/null
+++ b/test/files/run/t8570a.flags
@@ -0,0 +1 @@
+-Xcheckinit
diff --git a/test/files/run/t8570a.scala b/test/files/run/t8570a.scala
new file mode 100644
index 0000000000..ef116e2a8a
--- /dev/null
+++ b/test/files/run/t8570a.scala
@@ -0,0 +1,14 @@
+trait Trait40_1 {
+  val value37_2 = ()
+  def run = { value37_2 }
+}
+
+trait T1 extends Trait40_1 {
+  override val value37_2 = ()
+}
+
+object Test {
+  def main(args: Array[String]) {
+    println((new T1 {}).run)
+  }
+}