1 files changed, 5 insertions, 0 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/AddInterfaces.scala b/src/compiler/scala/tools/nsc/transform/AddInterfaces.scala
index 64b9740839..f7ad9be4b9 100644
--- a/src/compiler/scala/tools/nsc/transform/AddInterfaces.scala
+++ b/src/compiler/scala/tools/nsc/transform/AddInterfaces.scala
@@ -77,6 +77,11 @@ abstract class AddInterfaces extends InfoTransform {
       atPhase(implClassPhase) {
         val implName = nme.implClassName(iface.name)
         var impl = if (iface.owner.isClass) iface.owner.info.decl(implName) else NoSymbol
+        if (impl != NoSymbol && settings.XO.value) {
+          log("unlinking impl class " + impl)
+          iface.owner.info.decls.unlink(impl)
+          impl = NoSymbol
+        }
         if (impl == NoSymbol) {
           impl = iface.cloneSymbolImpl(iface.owner)
           impl.name = implName