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-rw-r--r--src/document/at.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/document/at.rs b/src/document/at.rs
index d318f17..2d35736 100644
--- a/src/document/at.rs
+++ b/src/document/at.rs
@@ -23,7 +23,7 @@ impl<'a> At<'a> {
pub(crate) fn new(doc: &'a Document, heads: &[ChangeHash]) -> Option<Self> {
heads
.iter()
- .all(|head| doc.get_change_by_hash(head).is_some())
+ .all(|head| crate::document::changes::holds(doc, head))
.then(|| Self {
doc,
heads: heads.to_vec(),