1 files changed, 7 insertions, 0 deletions
diff --git a/src/main/scala/firrtl/passes/ToWorkingIR.scala b/src/main/scala/firrtl/passes/ToWorkingIR.scala
index 2a814497..12a9bdd7 100644
--- a/src/main/scala/firrtl/passes/ToWorkingIR.scala
+++ b/src/main/scala/firrtl/passes/ToWorkingIR.scala
@@ -5,8 +5,15 @@ package firrtl.passes
 import firrtl.ir._
 import firrtl.Transform
 
+@deprecated(
+  "This pass is an identity transform. For an equivalent dependency, use firrtl.stage.forms.MinimalHighForm",
+  "FIRRTL 1.4.2"
+)
 object ToWorkingIR extends Pass {
   override def prerequisites = firrtl.stage.Forms.MinimalHighForm
+  override def optionalPrerequisites = Seq.empty
+  override def optionalPrerequisiteOf =
+    (firrtl.stage.Forms.LowFormOptimized.toSet -- firrtl.stage.Forms.MinimalHighForm).toSeq
   override def invalidates(a: Transform) = false
   def run(c:                  Circuit): Circuit = c
 }