trie: add start key to NodeIterator constructors

The 'step' method is split into two parts, 'peek' and 'push'. peek
returns the next state but doesn't make it current.

The end of iteration was previously tracked by setting 'trie' to nil.
End of iteration is now tracked using the 'iteratorEnd' error, which is
slightly cleaner and requires less code.

1 files changed, 1 insertions, 1 deletions

diff --git a/trie/trie_test.go b/trie/trie_test.go
index cacb08824..61adbba0c 100644
--- a/trie/trie_test.go
+++ b/trie/trie_test.go
@@ -439,7 +439,7 @@ func runRandTest(rt randTest) bool {
 			tr = newtr
 		case opItercheckhash:
 			checktr, _ := New(common.Hash{}, nil)
-			it := NewIterator(tr.NodeIterator())
+			it := NewIterator(tr.NodeIterator(nil))
 			for it.Next() {
 				checktr.Update(it.Key, it.Value)
 			}