3 files changed, 29 insertions, 2 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/Mixin.scala b/src/compiler/scala/tools/nsc/transform/Mixin.scala
index ebbb1d7798..57bdaea17a 100644
--- a/src/compiler/scala/tools/nsc/transform/Mixin.scala
+++ b/src/compiler/scala/tools/nsc/transform/Mixin.scala
@@ -269,7 +269,7 @@ abstract class Mixin extends InfoTransform with ast.TreeDSL {
 
     /** Mix in members of implementation class mixinClass into class clazz */
     def mixinImplClassMembers(mixinClass: Symbol, mixinInterface: Symbol) {
-      assert(mixinClass.isImplClass, "Not an impl class:" +
+      if (!mixinClass.isImplClass) debugwarn ("Impl class flag is not set " +
         ((mixinClass.debugLocationString, mixinInterface.debugLocationString)))
 
       for (member <- mixinClass.info.decls ; if isForwarded(member)) {
@@ -360,7 +360,6 @@ abstract class Mixin extends InfoTransform with ast.TreeDSL {
     // first complete the superclass with mixed in members
     addMixedinMembers(clazz.superClass, unit)
 
-    //Console.println("adding members of " + clazz.info.baseClasses.tail.takeWhile(superclazz !=) + " to " + clazz);//DEBUG
     for (mc <- clazz.mixinClasses ; if mc hasFlag lateINTERFACE) {
       // @SEAN: adding trait tracking so we don't have to recompile transitive closures
       unit.depends += mc
diff --git a/test/files/run/t5789.check b/test/files/run/t5789.check
new file mode 100644
index 0000000000..ea8d4966b1
--- /dev/null
+++ b/test/files/run/t5789.check
@@ -0,0 +1,14 @@
+Type in expressions to have them evaluated.
+Type :help for more information.
+
+scala> 
+
+scala>     val n = 2
+n: Int = 2
+
+scala>     () => n
+res0: () => Int = <function0>
+
+scala> 
+
+scala> 
diff --git a/test/files/run/t5789.scala b/test/files/run/t5789.scala
new file mode 100644
index 0000000000..461f6a4aae
--- /dev/null
+++ b/test/files/run/t5789.scala
@@ -0,0 +1,14 @@
+
+import scala.tools.nsc._
+import interpreter.ILoop
+import scala.tools.partest.ReplTest
+
+
+object Test extends ReplTest {
+  override def extraSettings = "-Yinline"
+  def code = """
+    val n = 2
+    () => n
+  """
+}
+