2 files changed, 6 insertions, 1 deletions
diff --git a/src/reflect/scala/reflect/internal/Mirrors.scala b/src/reflect/scala/reflect/internal/Mirrors.scala
index 019cf7f908..d16374476a 100644
--- a/src/reflect/scala/reflect/internal/Mirrors.scala
+++ b/src/reflect/scala/reflect/internal/Mirrors.scala
@@ -20,6 +20,8 @@ trait Mirrors extends api.Mirrors {
   trait RootSymbol extends Symbol { def mirror: Mirror }
 
   abstract class RootsBase(rootOwner: Symbol) extends scala.reflect.api.Mirror[Mirrors.this.type] { thisMirror =>
+    private[this] var initialized = false
+    def isMirrorInitialized = initialized
 
     protected[scala] def rootLoader: LazyType
 
@@ -229,6 +231,7 @@ trait Mirrors extends api.Mirrors {
     // }
 
     def init() {
+      if (initialized) return
       // Still fiddling with whether it's cleaner to do some of this setup here
       // or from constructors.  The latter approach tends to invite init order issues.
 
@@ -240,6 +243,8 @@ trait Mirrors extends api.Mirrors {
 
       RootClass.info.decls enter EmptyPackage
       RootClass.info.decls enter RootPackage
+
+      initialized = true
     }
   }
 
diff --git a/src/reflect/scala/reflect/internal/Types.scala b/src/reflect/scala/reflect/internal/Types.scala
index 1d3567b381..3516078ea1 100644
--- a/src/reflect/scala/reflect/internal/Types.scala
+++ b/src/reflect/scala/reflect/internal/Types.scala
@@ -1730,7 +1730,7 @@ trait Types extends api.Types { self: SymbolTable =>
 
   protected def defineBaseClassesOfCompoundType(tpe: CompoundType) {
     def define = defineBaseClassesOfCompoundType(tpe, force = false)
-    if (isPastTyper || !breakCycles) define
+    if (!breakCycles || isPastTyper) define
     else tpe match {
       // non-empty parents helpfully excludes all package classes
       case tpe @ ClassInfoType(_ :: _, _, clazz) if !clazz.isAnonOrRefinementClass =>