Suppressed unnecessary checkcasts on Throwables...

Suppressed unnecessary checkcasts on Throwables which were letting
AnyRefs reach the backend. Looks like this was my doing when trying to
wake back up the icode checker. Closes #4393, no review.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala b/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
index 64170482ce..249aefb10e 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
@@ -1153,7 +1153,7 @@ abstract class GenICode extends SubComponent  {
         ctx.bb.emit(DROP(from))
         ctx.bb.emit(CONSTANT(Constant(null)))
       }
-      else if (from == ThrowableReference) {
+      else if (from == ThrowableReference && !(ThrowableClass.tpe <:< to.toType)) {
         log("Inserted check-cast on throwable to " + to + " at " + pos)
         ctx.bb.emit(CHECK_CAST(to))
       }