Fix clippy warnings.

Author: eddyb

src/context.rs

@@ -348,19 +348,14 @@ pub struct EntityOrientedDenseMap<K: EntityOrientedMapKey<V>, V> {
 // since the ideal state is one chunk per map, the slow case might never be hit,
 // unless one `EntityOrientedDenseMap` is used with more than one `EntityDefs`,
 // which could still maybe be implemented more efficiently than `FxHashMap`.
-#[derive(Clone)]
+#[derive(Clone, Default)]
 enum SmallFxHashMap<K, V> {
+    #[default]
     Empty,
     One(K, V),
     More(FxHashMap<K, V>),
 }
 
-impl<K, V> Default for SmallFxHashMap<K, V> {
-    fn default() -> Self {
-        Self::Empty
-    }
-}
-
 impl<K: Copy + Eq + Hash, V: Default> SmallFxHashMap<K, V> {
     fn get_mut_or_insert_default(&mut self, k: K) -> &mut V {
         // HACK(eddyb) to avoid borrowing issues, this is done in two stages:

src/lib.rs

@@ -71,7 +71,7 @@
     clippy::dbg_macro,
     clippy::debug_assert_with_mut_call,
     clippy::doc_markdown,
-    clippy::empty_enum,
+    clippy::empty_enums,
     clippy::enum_glob_use,
     clippy::exit,
     clippy::expl_impl_clone_on_copy,
@@ -121,7 +121,6 @@
     clippy::string_add_assign,
     clippy::string_add,
     clippy::string_lit_as_bytes,
-    clippy::string_to_string,
     clippy::todo,
     clippy::trait_duplication_in_bounds,
     clippy::unimplemented,