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-rw-r--r--src/main/scala/firrtl/passes/ExpandWhens.scala2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/main/scala/firrtl/passes/ExpandWhens.scala b/src/main/scala/firrtl/passes/ExpandWhens.scala
index 956d54bc..23c7956a 100644
--- a/src/main/scala/firrtl/passes/ExpandWhens.scala
+++ b/src/main/scala/firrtl/passes/ExpandWhens.scala
@@ -256,7 +256,7 @@ object ExpandWhens extends Pass {
case class AttachAcc(exprs: Seq[WrappedExpression], idx: Int)
// Map from every attached expression to its corresponding AttachAcc
// (many keys will point to same value)
- val attachMap = mutable.HashMap.empty[WrappedExpression, AttachAcc]
+ val attachMap = mutable.LinkedHashMap.empty[WrappedExpression, AttachAcc]
for (Attach(_, es) <- attaches) {
val exprs = es.map(we(_))
val acc = exprs.map(attachMap.get(_)).flatten match {