shardtree: Add `InsertionError::MarkedRetentionInvalid`

shardtree/CHANGELOG.md

@@ -7,17 +7,20 @@ and this project adheres to Rust's notion of
 
 ## Unreleased
 
-## Added
+### Added
 - `ShardTree::{store, store_mut}`
 - `ShardTree::insert_frontier`
 
+### Changed
+- `shardtree::error::InsertionError` has new variant `MarkedRetentionInvalid`
+
 ## [0.2.0] - 2023-11-07
 
-## Added
+### Added
 - `ShardTree::{root_at_checkpoint_id, root_at_checkpoint_id_caching}`
 - `ShardTree::{witness_at_checkpoint_id, witness_at_checkpoint_id_caching}`
 
-## Changed
+### Changed
 - `ShardTree::root_at_checkpoint` and `ShardTree::root_at_checkpoint_caching` have
   been renamed to `root_at_checkpoint_depth` and `root_at_checkpoint_depth_caching`,
   respectively.

shardtree/src/error.rs

@@ -80,8 +80,7 @@ pub enum InsertionError {
     InputMalformed(Address),
     // The caller attempted to mark the empty tree state as corresponding to the state
     // for a spendable note.
-    // TODO: Add this proper error type for `shardtree-0.3.0`
+    MarkedRetentionInvalid,
-    //MarkedRetentionInvalid,
 }
 
 impl fmt::Display for InsertionError {
@@ -108,9 +107,10 @@ impl fmt::Display for InsertionError {
             InsertionError::TreeFull => write!(f, "Note commitment tree is full."),
             InsertionError::InputMalformed(addr) => {
                 write!(f, "Input malformed for insertion at address {:?}", addr)
-            } //InsertionError::MarkedRetentionInvalid => {
+            }
-              //    write!(f, "Cannot use `Marked` retention for the empty tree.")
+            InsertionError::MarkedRetentionInvalid => {
-              //}
+                write!(f, "Cannot use `Marked` retention for the empty tree.")
+            }
         }
     }
 }

shardtree/src/lib.rs

@@ -292,8 +292,7 @@ impl<
                     is_marked: true, ..
                 }
                 | Retention::Marked => Err(ShardTreeError::Insert(
-                    //TODO: use InsertionError::MarkedRetentionInvalid for `shardtree-0.3.0`
+                    InsertionError::MarkedRetentionInvalid,
-                    InsertionError::CheckpointOutOfOrder,
                 )),
             }
         }