Avoid implementing Debug for QueryConfig

compiler/rustc_query_system/src/query/config.rs

@@ -14,7 +14,7 @@ pub type HashResult<V> = Option<fn(&mut StableHashingContext<'_>, &V) -> Fingerp
 
 pub type TryLoadFromDisk<Qcx, V> = Option<fn(Qcx, SerializedDepNodeIndex) -> Option<V>>;
 
-pub trait QueryConfig<Qcx: QueryContext>: Copy + Debug {
+pub trait QueryConfig<Qcx: QueryContext>: Copy {
     fn name(self) -> &'static str;
 
     // `Key` and `Value` are `Copy` instead of `Clone` to ensure copying them stays cheap,

compiler/rustc_query_system/src/query/plumbing.rs

@@ -468,9 +468,9 @@ where
 
             dep_graph.with_task(
                 dep_node,
-                qcx,
-                (key, query),
-                |qcx, (key, query)| query.compute(qcx, key),
+                (qcx, query),
+                key,
+                |(qcx, query), key| query.compute(qcx, key),
                 query.hash_result(),
             )
         });