shardtree: Migrate to `bitflags 2`

shardtree/Cargo.toml

@@ -18,7 +18,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
 assert_matches = { version = "1.5", optional = true }
-bitflags = "1.3"
+bitflags = "2"
 either = "1.8"
 incrementalmerkletree = { version = "0.4", path = "../incrementalmerkletree" }
 proptest = { version = "1.0.0", optional = true }

shardtree/src/prunable.rs

@@ -14,6 +14,7 @@ use crate::{LocatedTree, Node, Tree};
 
 bitflags! {
     /// Flags storing the [`Retention`] state of a leaf.
+    #[derive(Clone, Copy, Debug, PartialEq, Eq)]
     pub struct RetentionFlags: u8 {
         /// An leaf with `EPHEMERAL` retention can be pruned as soon as we are certain that it is not part
         /// of the witness for a leaf with [`CHECKPOINT`] or [`MARKED`] retention.