Chisel plugin bundle elements handler (#2306) (#2380)

Adds generation of `Bundle.elements` method to the chores done by the compiler plugin
For each `Bundle` find the relevant visible Chisel field members and construct a
hard-coded list of the elements and their names implemented as `_elementsImpl`

For more details: See plugins/README.md

- Should be no change in API
- Handles inheritance and mixins
- Handles Seq[Data]
- Tests in BundleElementSpec

Co-authored-by: chick <chick.markley@sifive.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>
(cherry picked from commit 237200a420581519f29149cbae9b3e968c0d01fc)

Co-authored-by: Chick Markley <chick@qrhino.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/core/src/main/scala/chisel3/Data.scala b/core/src/main/scala/chisel3/Data.scala
index 9e9f5dbb..ef43a3b0 100644
--- a/core/src/main/scala/chisel3/Data.scala
+++ b/core/src/main/scala/chisel3/Data.scala
@@ -480,7 +480,7 @@ abstract class Data extends HasId with NamedComponent with SourceInfoDoc {
   protected[chisel3] def binding: Option[Binding] = _binding
   protected def binding_=(target: Binding) {
     if (_binding.isDefined) {
-      throw RebindingException(s"Attempted reassignment of binding to $this")
+      throw RebindingException(s"Attempted reassignment of binding to $this, from: ${target}")
     }
     _binding = Some(target)
   }