Make QueryConfig argument a type.

src/librustc/ty/query/config.rs

@@ -1,3 +1,5 @@
+//! Query configuration and description traits.
+
 use crate::dep_graph::SerializedDepNodeIndex;
 use crate::dep_graph::{DepKind, DepNode};
 use crate::ty::query::caches::QueryCache;
@@ -13,11 +15,7 @@ use std::borrow::Cow;
 use std::fmt::Debug;
 use std::hash::Hash;
 
-// Query configuration and description traits.
-
-// FIXME(eddyb) false positive, the lifetime parameter is used for `Key`/`Value`.
-#[allow(unused_lifetimes)]
-pub trait QueryConfig<'tcx> {
+pub trait QueryConfig<CTX> {
     const NAME: &'static str;
     const CATEGORY: ProfileCategory;
 
@@ -25,7 +23,7 @@ pub trait QueryConfig<'tcx> {
     type Value: Clone;
 }
 
-pub(crate) trait QueryAccessors<'tcx>: QueryConfig<'tcx> {
+pub(crate) trait QueryAccessors<'tcx>: QueryConfig<TyCtxt<'tcx>> {
     const ANON: bool;
     const EVAL_ALWAYS: bool;
     const DEP_KIND: DepKind;

src/librustc/ty/query/plumbing.rs

@@ -956,7 +956,7 @@ macro_rules! define_queries_inner {
             })*
         }
 
-        $(impl<$tcx> QueryConfig<$tcx> for queries::$name<$tcx> {
+        $(impl<$tcx> QueryConfig<TyCtxt<$tcx>> for queries::$name<$tcx> {
             type Key = $K;
             type Value = $V;
             const NAME: &'static str = stringify!($name);

src/librustc_metadata/rmeta/decoder/cstore_impl.rs

@@ -37,7 +37,7 @@ macro_rules! provide {
             $(fn $name<$lt: $lt, T: IntoArgs>(
                 $tcx: TyCtxt<$lt>,
                 def_id_arg: T,
-            ) -> <ty::queries::$name<$lt> as QueryConfig<$lt>>::Value {
+            ) -> <ty::queries::$name<$lt> as QueryConfig<TyCtxt<$lt>>>::Value {
                 let _prof_timer =
                     $tcx.prof.generic_activity("metadata_decode_entry");