Add ParentChildBeta example

src/example/modules/Modules.scala

@@ -7,6 +7,7 @@ object Modules {
     () => new Mux2,
     () => new WhichFruit,
     () => new ParentChild,
+    () => new ParentChildBeta,
     () => new ChildChild,
     () => new BlackBoxCase,
     () => new BlackBoxAggCase,

src/example/modules/ParentChildBeta.scala

@@ -0,0 +1,29 @@
+package example
+
+import knitkit._
+
+class AddBeta extends RawModule {
+  val in0 = IO(Input(UInt(32.W)))
+  val in1 = IO(Input(UInt(32.W)))
+  val out = IO(Output(UInt(32.W)))
+  val out1 = IO(Output(UInt(32.W)))
+  out := in0 + in1
+  out1 := in0 + in1
+}
+
+class ParentChildBeta extends RawModule {
+  val in0 = IO(Input(UInt(4.W)))
+  val in1 = IO(Input(UInt(4.W)))
+  val out = IO(Output(UInt(32.W)))
+
+  val u_add = Module(new AddBeta)()
+
+  val foo = Wire(UInt(32.W))
+
+  val add10 = Cat(in0, 10.U)
+  u_add("in0") := add10
+  u_add("in1") := Cat(Seq(5.U, 1.U))
+
+  foo := u_add("out1")
+  out := u_add("out") + 9.U
+}