fix clippy warnings

components/salsa-2022-macros/src/salsa_struct.rs

@@ -240,7 +240,6 @@ impl<A: AllowedOptions> SalsaStruct<A> {
         // `::salsa::debug::helper::SalsaDebug` will use `DebugWithDb` or fallbak to `Debug`
         let fields = self
             .all_fields()
-            .into_iter()
             .map(|field| -> TokenStream {
                 let field_name_string = field.name().to_string();
                 let field_getter = field.get_name();
@@ -338,7 +337,7 @@ impl SalsaField {
         if BANNED_FIELD_NAMES.iter().any(|n| *n == field_name_str) {
             return Err(syn::Error::new(
                 field_name.span(),
-                &format!(
+                format!(
                     "the field name `{}` is disallowed in salsa structs",
                     field_name_str
                 ),

components/salsa-2022-macros/src/tracked_fn.rs

@@ -105,6 +105,7 @@ pub(crate) fn tracked_impl(
         ),
         None => format!("{}", self_type_name),
     };
+    #[allow(clippy::manual_try_fold)] // we accumulate errors
     let extra_impls = item_impl
         .items
         .iter_mut()

components/salsa-2022-macros/src/tracked_struct.rs

@@ -130,6 +130,7 @@ impl TrackedStruct {
                 type Fields = ( #(#field_tys,)* );
                 type Revisions = [salsa::Revision; #arity];
 
+                #[allow(clippy::unused_unit)]
                 fn id_fields(fields: &Self::Fields) -> impl std::hash::Hash {
                     ( #( &fields.#id_field_indices ),* )
                 }

components/salsa-2022/src/debug.rs

@@ -221,11 +221,7 @@ pub mod helper {
     use std::{fmt, marker::PhantomData};
 
     pub trait Fallback<T: fmt::Debug, Db: ?Sized> {
-        fn salsa_debug<'a, 'b>(
-            a: &'a T,
-            _db: &'b Db,
-            _include_all_fields: bool,
-        ) -> &'a dyn fmt::Debug {
+        fn salsa_debug<'a>(a: &'a T, _db: &Db, _include_all_fields: bool) -> &'a dyn fmt::Debug {
             a
         }
     }

components/salsa-2022/src/hash.rs

@@ -1,4 +1,4 @@
-use std::hash::{BuildHasher, Hash, Hasher};
+use std::hash::{BuildHasher, Hash};
 
 pub(crate) type FxHasher = std::hash::BuildHasherDefault<rustc_hash::FxHasher>;
 pub(crate) type FxIndexSet<K> = indexmap::IndexSet<K, FxHasher>;
@@ -8,7 +8,5 @@ pub(crate) type FxLinkedHashSet<K> = hashlink::LinkedHashSet<K, FxHasher>;
 pub(crate) type FxHashSet<K> = std::collections::HashSet<K, FxHasher>;
 
 pub(crate) fn hash<T: Hash>(t: &T) -> u64 {
-    let mut hasher = FxHasher::default().build_hasher();
-    t.hash(&mut hasher);
-    hasher.finish()
+    FxHasher::default().hash_one(t)
 }

components/salsa-2022/src/plumbing.rs

@@ -4,7 +4,7 @@ use crate::storage::HasJars;
 
 /// Initializes the `DB`'s jars in-place
 ///
-/// # Safety:
+/// # Safety
 ///
 /// `init` must fully initialize all of jars fields
 pub unsafe fn create_jars_inplace<DB: HasJars>(init: impl FnOnce(*mut DB::Jars)) -> Box<DB::Jars> {
@@ -31,6 +31,7 @@ pub unsafe fn create_jars_inplace<DB: HasJars>(init: impl FnOnce(*mut DB::Jars))
 //
 // Safe if you know that data at `u` will remain shared
 // until the reference `t` expires.
+#[allow(clippy::needless_lifetimes)]
 pub(crate) unsafe fn transmute_lifetime<'t, 'u, T, U>(_t: &'t T, u: &'u U) -> &'t U {
     std::mem::transmute(u)
 }

components/salsa-2022/src/tracked_struct.rs

@@ -10,7 +10,6 @@ use crate::{
     ingredient_list::IngredientList,
     interned::{InternedId, InternedIngredient},
     key::{DatabaseKeyIndex, DependencyIndex},
-    plumbing::transmute_lifetime,
     runtime::{local_state::QueryOrigin, Runtime},
     salsa_struct::SalsaStructInDb,
     Database, Durability, Event, IngredientIndex, Revision,