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-rw-r--r--src/main/scala/firrtl/Driver.scala2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/main/scala/firrtl/Driver.scala b/src/main/scala/firrtl/Driver.scala
index 47841cec..c277e120 100644
--- a/src/main/scala/firrtl/Driver.scala
+++ b/src/main/scala/firrtl/Driver.scala
@@ -248,6 +248,8 @@ object Driver {
case p: PassException => throw p
case p: PassExceptions => throw p
case p: FIRRTLException => throw p
+ // Propagate exceptions from custom transforms
+ case CustomTransformException(cause) => throw cause
// Treat remaining exceptions as internal errors.
case e: Exception => throwInternalError(exception = Some(e))
}