any message taken as delivered

1 files changed, 5 insertions, 0 deletions

diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index 17d6d4c..426ef72 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -666,6 +666,11 @@ pub(crate) struct SyncEnvelope {
     /// the writer's, on its own push and on every member's after; None otherwise
     /// (answers, pulls).
     pub(crate) writer: Option<u64>,
+    /// The sender takes the message as delivered (`SyncSession::assume_delivered`): it
+    /// had everything the receiver had, so the receiver will hold exactly the sender's
+    /// heads, and the sender awaits no answer. A receiver it leaves level with the
+    /// sender answers nothing; one that has changes the sender lacks answers with them.
+    pub(crate) delivered: bool,
 }
 
 /// What a sync envelope carries.