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-rw-r--r--consensus/errors.go4
1 files changed, 4 insertions, 0 deletions
diff --git a/consensus/errors.go b/consensus/errors.go
index 3b136dbdd..a005c5f63 100644
--- a/consensus/errors.go
+++ b/consensus/errors.go
@@ -23,6 +23,10 @@ var (
// that is unknown.
ErrUnknownAncestor = errors.New("unknown ancestor")
+ // ErrPrunedAncestor is returned when validating a block requires an ancestor
+ // that is known, but the state of which is not available.
+ ErrPrunedAncestor = errors.New("pruned ancestor")
+
// ErrFutureBlock is returned when a block's timestamp is in the future according
// to the current node.
ErrFutureBlock = errors.New("block in the future")