Lazily generate more detailed error messages in CheckHighFormLike

Don't serialize Expressions unless there is an error

1 files changed, 2 insertions, 2 deletions

diff --git a/src/main/scala/firrtl/passes/CheckHighForm.scala b/src/main/scala/firrtl/passes/CheckHighForm.scala
index 25bfc20b..6f8f6a8c 100644
--- a/src/main/scala/firrtl/passes/CheckHighForm.scala
+++ b/src/main/scala/firrtl/passes/CheckHighForm.scala
@@ -151,14 +151,14 @@ trait CheckHighFormLike { this: Pass =>
       case _ => // Do Nothing
     }
 
-    def checkHighFormW(info: Info, mname: String)(w: Width): Unit = {
+    def checkHighFormW(info: Info, mname: => String)(w: Width): Unit = {
       w match {
         case wx: IntWidth if wx.width < 0 => errors.append(new NegWidthException(info, mname))
         case wx => // Do nothing
       }
     }
 
-    def checkHighFormT(info: Info, mname: String)(t: Type): Unit = {
+    def checkHighFormT(info: Info, mname: => String)(t: Type): Unit = {
       t foreach checkHighFormT(info, mname)
       t match {
         case tx: VectorType if tx.size < 0 =>