polkadot: eradicate LeafStatus (#1565)

Fixes #768.

polkadot/node/subsystem-types/src/lib.rs

@@ -51,35 +51,6 @@ pub use polkadot_node_jaeger as jaeger;
 /// If there are greater than this number of slots, then we fall back to a heap vector.
 const ACTIVE_LEAVES_SMALLVEC_CAPACITY: usize = 8;
 
-/// The status of an activated leaf.
-#[derive(Clone, Debug, PartialEq)]
-pub enum LeafStatus {
-	/// A leaf is fresh when it's the first time the leaf has been encountered.
-	/// Most leaves should be fresh.
-	Fresh,
-	/// A leaf is stale when it's encountered for a subsequent time. This will happen
-	/// when the chain is reverted or the fork-choice rule abandons some chain.
-	Stale,
-}
-
-impl LeafStatus {
-	/// Returns a `bool` indicating fresh status.
-	pub fn is_fresh(&self) -> bool {
-		match *self {
-			LeafStatus::Fresh => true,
-			LeafStatus::Stale => false,
-		}
-	}
-
-	/// Returns a `bool` indicating stale status.
-	pub fn is_stale(&self) -> bool {
-		match *self {
-			LeafStatus::Fresh => false,
-			LeafStatus::Stale => true,
-		}
-	}
-}
-
 /// Activated leaf.
 #[derive(Debug, Clone)]
 pub struct ActivatedLeaf {
@@ -87,8 +58,6 @@ pub struct ActivatedLeaf {
 	pub hash: Hash,
 	/// The block number.
 	pub number: BlockNumber,
-	/// The status of the leaf.
-	pub status: LeafStatus,
 	/// A handle to unpin the block on drop.
 	pub unpin_handle: UnpinHandle,
 	/// An associated [`jaeger::Span`].