From 55bf5051adea17b5981d4f567d9e9dc6865f7af7 Mon Sep 17 00:00:00 2001
From: Gustav Simonsson <gustav.simonsson@gmail.com>
Date: Mon, 1 Jun 2015 22:43:05 +0200
Subject: [PATCH] Unsupport bruncles

---
 core/block_processor.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/block_processor.go b/core/block_processor.go
index ca205ee863..a3ad383d0c 100644
--- a/core/block_processor.go
+++ b/core/block_processor.go
@@ -364,8 +364,8 @@ func (sm *BlockProcessor) VerifyUncles(statedb *state.StateDB, block, parent *ty
 			return UncleError("uncle[%d](%x) is ancestor", i, hash[:4])
 		}
 
-		if !ancestors.Has(uncle.ParentHash) {
-			return UncleError("uncle[%d](%x)'s parent unknown (%x)", i, hash[:4], uncle.ParentHash[0:4])
+		if !ancestors.Has(uncle.ParentHash) || uncle.ParentHash == parent.Hash() {
+			return UncleError("uncle[%d](%x)'s parent is not ancestor (%x)", i, hash[:4], uncle.ParentHash[0:4])
 		}
 
 		if err := sm.ValidateHeader(uncle, ancestorHeaders[uncle.ParentHash], true); err != nil {