Support Vec(0) fields in Bundles, just like Option[Data]; add test

This also allows asUInt/asTypeOf to work properly on those Bundles,
even though zero-width wire support is lacking.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/test/scala/chiselTests/Vec.scala b/src/test/scala/chiselTests/Vec.scala
index 80c4040d..438cf515 100644
--- a/src/test/scala/chiselTests/Vec.scala
+++ b/src/test/scala/chiselTests/Vec.scala
@@ -136,6 +136,14 @@ class OneBitUnitRegVecTester extends BasicTester {
 
 class ZeroEntryVecTester extends BasicTester {
   require(Vec(0, Bool()).getWidth == 0)
+
+  val bundleWithZeroEntryVec = new Bundle {
+    val foo = Bool()
+    val bar = Vec(0, Bool())
+  }
+  require(0.U.asTypeOf(bundleWithZeroEntryVec).getWidth == 1)
+  require(bundleWithZeroEntryVec.asUInt.getWidth == 1)
+
   stop()
 }