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-rw-r--r--src/main/scala/firrtl/options/Phase.scala2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/main/scala/firrtl/options/Phase.scala b/src/main/scala/firrtl/options/Phase.scala
index a9656407..0f29d165 100644
--- a/src/main/scala/firrtl/options/Phase.scala
+++ b/src/main/scala/firrtl/options/Phase.scala
@@ -138,7 +138,7 @@ trait DependencyAPI[A <: DependencyAPI[A]] { this: TransformLike[_] =>
*/
trait PreservesAll[A <: DependencyAPI[A]] { this: DependencyAPI[A] =>
- override def invalidates(a: A): Boolean = false
+ override final def invalidates(a: A): Boolean = false
}