squelch most clippy warnings in generated code (#809)

Author: gvozdvmozgu

components/salsa-macro-rules/src/setup_accumulator_impl.rs

@@ -15,6 +15,8 @@ macro_rules! setup_accumulator_impl {
             $ingredient:ident,
         ]
     ) => {
+        #[allow(clippy::all)]
+        #[allow(dead_code)]
         const _: () = {
             use salsa::plumbing as $zalsa;
             use salsa::plumbing::accumulator as $zalsa_struct;

components/salsa-macro-rules/src/setup_input_struct.rs

@@ -63,6 +63,8 @@ macro_rules! setup_input_struct {
         #[derive(Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
         $vis struct $Struct(salsa::Id);
 
+        #[allow(clippy::all)]
+        #[allow(dead_code)]
         const _: () = {
             use salsa::plumbing as $zalsa;
             use $zalsa::input as $zalsa_struct;

components/salsa-macro-rules/src/setup_interned_struct.rs

@@ -78,6 +78,8 @@ macro_rules! setup_interned_struct {
             std::marker::PhantomData < & $interior_lt salsa::plumbing::interned::Value <$StructWithStatic> >
         );
 
+        #[allow(clippy::all)]
+        #[allow(dead_code)]
         const _: () = {
             use salsa::plumbing as $zalsa;
             use $zalsa::interned as $zalsa_struct;

components/salsa-macros/src/db.rs

@@ -86,6 +86,8 @@ impl DbMacro {
         let zalsa = self.hygiene.ident("zalsa");
 
         Ok(quote! {
+            #[allow(clippy::all)]
+            #[allow(dead_code)]
             const _: () = {
                 use salsa::plumbing as #zalsa;