use 'mixin/abstract class' instead of 'trait'

3 files changed, 3 insertions, 3 deletions

diff --git a/src/compiler/scala/tools/nsc/backend/icode/Linearizers.scala b/src/compiler/scala/tools/nsc/backend/icode/Linearizers.scala
index ae326c0714..c0b6ada3c3 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/Linearizers.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/Linearizers.scala
@@ -13,7 +13,7 @@ import scala.collection.mutable.{Stack, HashSet};
 mixin class Linearizers requires ICodes {
   import opcodes._;
 
-  trait Linearizer {
+  abstract class Linearizer {
     def linearize(c: IMethod): List[BasicBlock];
   }
 
diff --git a/src/compiler/scala/tools/nsc/backend/icode/Opcodes.scala b/src/compiler/scala/tools/nsc/backend/icode/Opcodes.scala
index 40e2e64639..57fa0ff327 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/Opcodes.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/Opcodes.scala
@@ -427,7 +427,7 @@ mixin class Opcodes requires ICodes {
     }
 
     /** This class represents a method invocation style. */
-    trait InvokeStyle {
+    sealed abstract class InvokeStyle {
 
       /** Is this a dynamic method call? */
       def isDynamic: Boolean = this match {
diff --git a/src/compiler/scala/tools/nsc/backend/icode/TypeStacks.scala b/src/compiler/scala/tools/nsc/backend/icode/TypeStacks.scala
index 69f1f34cb7..6aa8507c57 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/TypeStacks.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/TypeStacks.scala
@@ -9,7 +9,7 @@ package scala.tools.nsc.backend.icode;
 
 import scala.tools.nsc.backend.icode.Primitives;
 
-trait TypeStacks requires ICodes {
+mixin class TypeStacks requires ICodes {
   import opcodes._;
   import global.{Symbol, Type, definitions};