Remove the $tcx:tt parameter from rustc_query_description

It's unnecessary.

Author: jyn514

compiler/rustc_macros/src/query.rs

@@ -258,13 +258,13 @@ fn add_query_description_impl(query: &Query, impls: &mut proc_macro2::TokenStrea
         let try_load_from_disk = if let Some((tcx, id, block)) = modifiers.load_cached.as_ref() {
             // Use custom code to load the query from disk
             quote! {
-                const TRY_LOAD_FROM_DISK: Option<fn(QueryCtxt<$tcx>, SerializedDepNodeIndex) -> Option<Self::Value>>
+                const TRY_LOAD_FROM_DISK: Option<fn(QueryCtxt<'tcx>, SerializedDepNodeIndex) -> Option<Self::Value>>
                     = Some(|#tcx, #id| { #block });
             }
         } else {
             // Use the default code to load the query from disk
             quote! {
-                const TRY_LOAD_FROM_DISK: Option<fn(QueryCtxt<$tcx>, SerializedDepNodeIndex) -> Option<Self::Value>>
+                const TRY_LOAD_FROM_DISK: Option<fn(QueryCtxt<'tcx>, SerializedDepNodeIndex) -> Option<Self::Value>>
                     = Some(|tcx, id| tcx.on_disk_cache().as_ref()?.try_load_query_result(*tcx, id));
             }
         };
@@ -291,7 +291,7 @@ fn add_query_description_impl(query: &Query, impls: &mut proc_macro2::TokenStrea
                 false
             }
 
-            const TRY_LOAD_FROM_DISK: Option<fn(QueryCtxt<$tcx>, SerializedDepNodeIndex) -> Option<Self::Value>> = None;
+            const TRY_LOAD_FROM_DISK: Option<fn(QueryCtxt<'tcx>, SerializedDepNodeIndex) -> Option<Self::Value>> = None;
         }
     };
 
@@ -300,7 +300,7 @@ fn add_query_description_impl(query: &Query, impls: &mut proc_macro2::TokenStrea
 
     let desc = quote! {
         #[allow(unused_variables)]
-        fn describe(tcx: QueryCtxt<$tcx>, key: Self::Key) -> String {
+        fn describe(tcx: QueryCtxt<'tcx>, key: Self::Key) -> String {
             let (#tcx, #key) = (*tcx, key);
             ::rustc_middle::ty::print::with_no_trimmed_paths!(
                 format!(#desc)
@@ -309,7 +309,7 @@ fn add_query_description_impl(query: &Query, impls: &mut proc_macro2::TokenStrea
     };
 
     impls.extend(quote! {
-        (#name<$tcx:tt>) => {
+        (#name) => {
             #desc
             #cache
         };

compiler/rustc_query_impl/src/plumbing.rs

@@ -322,7 +322,7 @@ macro_rules! define_queries {
         }
 
         impl<'tcx> QueryDescription<QueryCtxt<'tcx>> for queries::$name<'tcx> {
-            rustc_query_description! { $name<'tcx> }
+            rustc_query_description! { $name }
 
             type Cache = query_storage::$name<'tcx>;