From 601c9e769ec3f231b1ae9246da977c71cf43371f Mon Sep 17 00:00:00 2001
From: Antioch Peverell <30642645+antiochp@users.noreply.github.com>
Date: Wed, 30 May 2018 10:15:37 -0400
Subject: [PATCH] all duplicates (incorrectly) to maintain compatibility with
 testnet2 (#1103)

---
 chain/src/txhashset.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/chain/src/txhashset.rs b/chain/src/txhashset.rs
index 07ad5072..41408f57 100644
--- a/chain/src/txhashset.rs
+++ b/chain/src/txhashset.rs
@@ -513,7 +513,14 @@ impl<'a> Extension<'a> {
 				// processing a new fork so we may get a position on the old
 				// fork that exists but matches a different node
 				// filtering that case out
-				if hash == OutputIdentifier::from_output(out).hash_with_index(pos - 1) {
+				//
+				// TODO - the following call to hash() is *INCORRECT*
+				// TODO - we should be calling hash_with_index(pos - 1)
+				// TODO - but we cannot safely make this change in testnet2
+				// TODO - with this incorrect behavior we never get a match, so duplicates are
+				// allowed
+				//
+				if hash == OutputIdentifier::from_output(out).hash() {
 					return Err(Error::DuplicateCommitment(commit));
 				}
 			}