Convert PreservesAll to explicit invalidates=false

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/main/scala/firrtl/options/phases/Checks.scala b/src/main/scala/firrtl/options/phases/Checks.scala
index ed2f1a28..7dce7bbe 100644
--- a/src/main/scala/firrtl/options/phases/Checks.scala
+++ b/src/main/scala/firrtl/options/phases/Checks.scala
@@ -4,18 +4,20 @@ package firrtl.options.phases
 
 import firrtl.AnnotationSeq
 import firrtl.annotations.Annotation
-import firrtl.options.{OptionsException, OutputAnnotationFileAnnotation, Phase, PreservesAll, TargetDirAnnotation}
+import firrtl.options.{OptionsException, OutputAnnotationFileAnnotation, Phase, TargetDirAnnotation}
 import firrtl.options.Dependency
 
 /** [[firrtl.options.Phase Phase]] that validates an [[AnnotationSeq]]. If successful, views of this [[AnnotationSeq]]
   * as [[StageOptions]] are guaranteed to succeed.
   */
-class Checks extends Phase with PreservesAll[Phase] {
+class Checks extends Phase {
 
   override def prerequisites = Seq(Dependency[GetIncludes], Dependency[ConvertLegacyAnnotations], Dependency[AddDefaults])
 
   override def optionalPrerequisiteOf = Seq.empty
 
+  override def invalidates(a: Phase) = false
+
   /** Validate an [[AnnotationSeq]] for [[StageOptions]]
     * @throws OptionsException if annotations are invalid
     */