From b14d25ea9470b352d00acb0d3feedfe92b62fa45 Mon Sep 17 00:00:00 2001
From: Jiuyang Liu
Date: Sun, 25 Jul 2021 19:03:12 +0800
Subject: Add typedef in DependencyManager.

This is a bug fix, before this PR, Scala compiler will infer `Nothing`, which makes code below failed to compile:
```
class UserCompiler extends TransformManager(Seq(Dependency(UserPass))) {
  override def optionalPrerequisiteOf: Seq[TransformDependency] = Seq(
    Dependency[DedupModules]
  )
}
```
---
 src/main/scala/firrtl/options/DependencyManager.scala | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/main/scala/firrtl/options/DependencyManager.scala b/src/main/scala/firrtl/options/DependencyManager.scala
index f8299bbb..ae22b4b4 100644
--- a/src/main/scala/firrtl/options/DependencyManager.scala
+++ b/src/main/scala/firrtl/options/DependencyManager.scala
@@ -20,11 +20,11 @@ case class DependencyManagerException(message: String, cause: Throwable = null)
 trait DependencyManager[A, B <: TransformLike[A] with DependencyAPI[B]] extends TransformLike[A] with DependencyAPI[B] {
   import DependencyManagerUtils.CharSet
 
-  override def prerequisites = currentState
+  override def prerequisites: Seq[Dependency[B]] = currentState
 
-  override def optionalPrerequisites = Seq.empty
+  override def optionalPrerequisites: Seq[Dependency[B]] = Seq.empty
 
-  override def optionalPrerequisiteOf = Seq.empty
+  override def optionalPrerequisiteOf: Seq[Dependency[B]] = Seq.empty
 
   override def invalidates(a: B): Boolean = (_currentState &~ _targets)(oToD(a))
 
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