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-rw-r--r--src/main/scala/firrtl/WIR.scala4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/main/scala/firrtl/WIR.scala b/src/main/scala/firrtl/WIR.scala
index 05173f56..74ccabf4 100644
--- a/src/main/scala/firrtl/WIR.scala
+++ b/src/main/scala/firrtl/WIR.scala
@@ -53,8 +53,8 @@ case class WRef(name:String,tpe:Type,kind:Kind,gender:Gender) extends Expression
case class WSubField(exp:Expression,name:String,tpe:Type,gender:Gender) extends Expression
case class WSubIndex(exp:Expression,value:Int,tpe:Type,gender:Gender) extends Expression
case class WSubAccess(exp:Expression,index:Expression,tpe:Type,gender:Gender) extends Expression
-case class WVoid() extends Expression
-case class WInvalid() extends Expression
+case class WVoid() extends Expression { def tpe = UnknownType() }
+case class WInvalid() extends Expression { def tpe = UnknownType() }
case class WDefInstance(info:Info,name:String,module:String,tpe:Type) extends Stmt
case object ADDW_OP extends PrimOp