delete some dead code, squash wanings

components/salsa-2022/src/function/memo.rs

@@ -42,18 +42,6 @@ impl<K: AsId, V> MemoMap<K, V> {
     pub(super) fn get(&self, key: K) -> Option<Guard<Arc<Memo<V>>>> {
         self.map.get(&key).map(|v| v.load())
     }
-
-    /// Iterates over the entries in the map. This holds a read lock while iteration continues.
-    pub(super) fn iter(&self) -> impl Iterator<Item = (K, Arc<Memo<V>>)> + '_ {
-        self.map
-            .iter()
-            .map(move |r| (*r.key(), r.value().load_full()))
-    }
-
-    /// Clears the memo of all entries.
-    pub(super) fn clear(&self) {
-        self.map.clear()
-    }
 }
 
 #[derive(Debug)]

components/salsa-2022/src/key.rs

@@ -38,7 +38,7 @@ impl<Db> crate::debug::DebugWithDb<Db> for DependencyIndex
 where
     Db: ?Sized + Database,
 {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>, db: &Db) -> std::fmt::Result {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>, _db: &Db) -> std::fmt::Result {
         write!(f, "{:?}", *self) // FIXME
     }
 }

components/salsa-2022/src/revision.rs

@@ -60,11 +60,4 @@ impl AtomicRevision {
     pub(crate) fn store(&self, r: Revision) {
         self.data.store(r.as_usize(), Ordering::SeqCst);
     }
-
-    /// Increment by 1, returning previous value.
-    pub(crate) fn fetch_then_increment(&self) -> Revision {
-        let v = self.data.fetch_add(1, Ordering::SeqCst);
-        assert!(v != usize::max_value(), "revision overflow");
-        Revision::from(v)
-    }
 }

components/salsa-2022/src/runtime/active_query.rs

@@ -2,7 +2,7 @@ use std::collections::BTreeSet;
 
 use crate::{
     durability::Durability,
-    hash::{FxHashSet, FxIndexMap, FxIndexSet},
+    hash::{FxIndexMap, FxIndexSet},
     key::{DatabaseKeyIndex, DependencyIndex},
     tracked_struct::Disambiguator,
     Cycle, Revision, Runtime,