From 0fde0d737938517d4b8cba4f65420987c66c508c Mon Sep 17 00:00:00 2001
From: carllin <wumu727@gmail.com>
Date: Thu, 25 Jun 2020 16:39:55 -0700
Subject: [PATCH] Add ancestor iterator to lib.rs (#10813)

Co-authored-by: Carl <carl@solana.com>
---
 ledger/src/ancestor_iterator.rs | 6 ++----
 ledger/src/lib.rs               | 1 +
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/ledger/src/ancestor_iterator.rs b/ledger/src/ancestor_iterator.rs
index ee61f9ddd7..0c01757d6e 100644
--- a/ledger/src/ancestor_iterator.rs
+++ b/ledger/src/ancestor_iterator.rs
@@ -25,7 +25,7 @@ impl<'a> Iterator for AncestorIterator<'a> {
     type Item = Slot;
 
     fn next(&mut self) -> Option<Self::Item> {
-        let current = self.current.clone();
+        let current = self.current;
         current.map(|slot| {
             if slot != 0 {
                 self.current = self.blockstore.meta(slot).unwrap().and_then(|slot_meta| {
@@ -101,9 +101,7 @@ mod tests {
             fill_blockstore_slot_with_ticks(&blockstore, ticks_per_slot, 4, fork_point, fork_hash);
 
         // Test correctness
-        assert!(AncestorIterator::new(0, &blockstore)
-            .collect::<Vec<Slot>>()
-            .is_empty());
+        assert!(AncestorIterator::new(0, &blockstore).next().is_none());
         assert_eq!(
             AncestorIterator::new(4, &blockstore).collect::<Vec<Slot>>(),
             vec![1, 0]
diff --git a/ledger/src/lib.rs b/ledger/src/lib.rs
index 318b2be998..b034f8d3c3 100644
--- a/ledger/src/lib.rs
+++ b/ledger/src/lib.rs
@@ -2,6 +2,7 @@ pub mod bank_forks_utils;
 pub mod block_error;
 #[macro_use]
 pub mod blockstore;
+pub mod ancestor_iterator;
 pub mod blockstore_db;
 pub mod blockstore_meta;
 pub mod blockstore_processor;