fix

examples/sftp/src/main.rs

@@ -352,12 +352,10 @@ impl SyncFilter for Filter {
             })
             .collect::<Vec<_>>();
 
-        ticket
-            .pass_with_placeholder(
-                (!placeholders.is_empty()).then_some(&*placeholders),
-                placeholders.len() as _,
-            )
-            .unwrap();
+        match placeholders.is_empty() {
+            true => ticket.pass().unwrap(),
+            false => ticket.pass_with_placeholder(&*placeholders).unwrap(),
+        };
     }
 
     fn closed(&self, request: Request, info: info::Closed) {

src/filter/ticket.rs

@@ -77,15 +77,23 @@ impl FetchPlaceholders {
         }
     }
 
+    /// Returns the empty list of placeholders.
+    pub fn pass<'a>(&self) -> core::Result<Vec<core::Result<Usn>>> {
+        command::CreatePlaceholders {
+            placeholders: None,
+            total: 0,
+        }
+        .execute(self.connection_key, self.transfer_key)
+    }
+
     /// Returns the list of placeholders.
     pub fn pass_with_placeholder<'a>(
         &self,
-        placeholders: impl Into<Option<&'a [PlaceholderFile<'a>]>>,
-        total: u64,
+        placeholders: &'a [PlaceholderFile<'a>],
     ) -> core::Result<Vec<core::Result<Usn>>> {
         command::CreatePlaceholders {
-            placeholders: placeholders.into(),
-            total,
+            placeholders: Some(placeholders),
+            total: placeholders.len() as _,
         }
         .execute(self.connection_key, self.transfer_key)
     }