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-rw-r--r--src/main/scala/chisel3/util/Conditional.scala2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/main/scala/chisel3/util/Conditional.scala b/src/main/scala/chisel3/util/Conditional.scala
index f558b7ba..1d2805ad 100644
--- a/src/main/scala/chisel3/util/Conditional.scala
+++ b/src/main/scala/chisel3/util/Conditional.scala
@@ -28,7 +28,7 @@ class SwitchContext[T <: Bits](cond: T, whenContext: Option[WhenContext], lits:
def is(v: Iterable[T])(block: => Unit): SwitchContext[T] = {
if (!v.isEmpty) {
val newLits = v.map { w =>
- require(w.litToBigIntOption != None, "is condition must be literal")
+ require(w.litToBigIntOption.isDefined, "is condition must be literal")
val value = w.litToBigInt
require(!lits.contains(value), "all is conditions must be mutually exclusive!")
value