fix: allow unused lifetimes in tracked_struct expansion (#824)

Author: Veykril

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

@@ -87,7 +87,6 @@ macro_rules! setup_tracked_struct {
             $Configuration:ident,
             $CACHE:ident,
             $Db:ident,
-            $NonNull:ident,
             $Revision:ident,
         ]
     ) => {
@@ -104,7 +103,6 @@ macro_rules! setup_tracked_struct {
             use salsa::plumbing as $zalsa;
             use $zalsa::tracked_struct as $zalsa_struct;
             use $zalsa::Revision as $Revision;
-            use std::ptr::NonNull as $NonNull;
 
             type $Configuration = $Struct<'static>;
 
@@ -207,8 +205,8 @@ macro_rules! setup_tracked_struct {
 
                 #[inline]
                 fn cast(id: $zalsa::Id, type_id: $zalsa::TypeId) -> $zalsa::Option<Self> {
-                    if type_id == $zalsa::TypeId::of::<$Struct>() {
-                        $zalsa::Some(<$Struct as $zalsa::FromId>::from_id(id))
+                    if type_id == $zalsa::TypeId::of::<$Struct<'static>>() {
+                        $zalsa::Some(<$Struct<'static> as $zalsa::FromId>::from_id(id))
                     } else {
                         $zalsa::None
                     }
@@ -289,6 +287,7 @@ macro_rules! setup_tracked_struct {
                 )*
             }
 
+            #[allow(unused_lifetimes)]
             impl<'_db> $Struct<'_db> {
                 /// Default debug formatting for this struct (may be useful if you define your own `Debug` impl)
                 pub fn default_debug_fmt(this: Self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result

components/salsa-macros/src/tracked_struct.rs

@@ -119,7 +119,6 @@ impl Macro {
         let Configuration = self.hygiene.ident("Configuration");
         let CACHE = self.hygiene.ident("CACHE");
         let Db = self.hygiene.ident("Db");
-        let NonNull = self.hygiene.ident("NonNull");
         let Revision = self.hygiene.ident("Revision");
 
         Ok(crate::debug::dump_tokens(
@@ -160,7 +159,6 @@ impl Macro {
                         #Configuration,
                         #CACHE,
                         #Db,
-                        #NonNull,
                         #Revision,
                     ]
                 );