Simplify the syntax for macros generated by rustc_queries

- Disallow multiple macros callbacks in the same invocation. In practice, this was never used.
- Remove the `[]` brackets around the macro name
- Require an `ident`, not an arbitrary `tt`

Author: jyn514

compiler/rustc_macros/src/query.rs

@@ -400,15 +400,15 @@ pub fn rustc_queries(input: TokenStream) -> TokenStream {
     TokenStream::from(quote! {
         #[macro_export]
         macro_rules! rustc_query_append {
-            ([$($macro:tt)*]) => {
-                $($macro)* {
+            ($macro:ident !) => {
+                $macro! {
                     #query_stream
                 }
             }
         }
         macro_rules! rustc_dep_node_append {
-            ([$($macro:tt)*][$($other:tt)*]) => {
-                $($macro)*(
+            ($macro:ident! [$($other:tt)*]) => {
+                $macro!(
                     $($other)*
 
                     #dep_node_def_stream
@@ -417,8 +417,8 @@ pub fn rustc_queries(input: TokenStream) -> TokenStream {
         }
         #[macro_export]
         macro_rules! rustc_cached_queries {
-            ($($macro:tt)*) => {
-                $($macro)*(#cached_queries);
+            ( $macro:ident! ) => {
+                $macro!(#cached_queries);
             }
         }
         #[macro_export]

compiler/rustc_middle/src/dep_graph/dep_node.rs

@@ -179,7 +179,7 @@ macro_rules! define_dep_nodes {
     );
 }
 
-rustc_dep_node_append!([define_dep_nodes!][
+rustc_dep_node_append!(define_dep_nodes![
     // We use this for most things when incr. comp. is turned off.
     [] Null,
 

compiler/rustc_middle/src/ty/query.rs

@@ -332,7 +332,7 @@ macro_rules! define_callbacks {
 // Queries marked with `fatal_cycle` do not need the latter implementation,
 // as they will raise an fatal error on query cycles instead.
 
-rustc_query_append! { [define_callbacks!] }
+rustc_query_append! { define_callbacks! }
 
 mod sealed {
     use super::{DefId, LocalDefId};

compiler/rustc_query_impl/src/lib.rs

@@ -54,7 +54,7 @@ fn describe_as_module(def_id: LocalDefId, tcx: TyCtxt<'_>) -> String {
     }
 }
 
-rustc_query_append! { [define_queries!] }
+rustc_query_append! { define_queries! }
 
 impl<'tcx> Queries<'tcx> {
     // Force codegen in the dyn-trait transformation in this crate.

compiler/rustc_query_impl/src/profiling_support.rs

@@ -320,5 +320,5 @@ pub fn alloc_self_profile_query_strings(tcx: TyCtxt<'_>) {
         }
     }
 
-    rustc_query_append! { [alloc_once!] }
+    rustc_query_append! { alloc_once! }
 }