made ./x.py check happy and ran ./x.py test tidy

compiler/rustc_trait_selection/src/traits/coherence.rs

@@ -161,11 +161,17 @@ fn overlap_within_probe<'cx, 'tcx>(
     b_def_id: DefId,
     snapshot: &CombinedSnapshot<'_, 'tcx>,
 ) -> Option<OverlapResult<'tcx>> {
-    fn loose_check<'cx, 'tcx>(selcx: &mut SelectionContext<'cx, 'tcx>, o: &PredicateObligation<'tcx>) -> bool {
+    fn loose_check<'cx, 'tcx>(
+        selcx: &mut SelectionContext<'cx, 'tcx>,
+        o: &PredicateObligation<'tcx>,
+    ) -> bool {
         !selcx.predicate_may_hold_fatal(o)
     }
 
-    fn strict_check<'cx, 'tcx>(selcx: &SelectionContext<'cx, 'tcx>, o: &PredicateObligation<'tcx>) -> bool {
+    fn strict_check<'cx, 'tcx>(
+        selcx: &SelectionContext<'cx, 'tcx>,
+        o: &PredicateObligation<'tcx>,
+    ) -> bool {
         let infcx = selcx.infcx();
         let tcx = infcx.tcx;
         o.flip_polarity(tcx)
@@ -518,7 +524,11 @@ fn orphan_check_trait_ref<'tcx>(
 /// - for `Foo<u32>`, where `Foo` is a local type, this returns `[]`.
 /// - `&mut u32` returns `[u32]`, as `&mut` is a fundamental type, similar to `Box`.
 /// - `Box<Foo<u32>>` returns `[]`, as `Box` is a fundamental type and `Foo` is local.
-fn contained_non_local_types<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, in_crate: InCrate) -> Vec<Ty<'tcx>> {
+fn contained_non_local_types<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    ty: Ty<'tcx>,
+    in_crate: InCrate,
+) -> Vec<Ty<'tcx>> {
     if ty_is_local_constructor(ty, in_crate) {
         Vec::new()
     } else {

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -1173,7 +1173,7 @@ trait InferCtxtPrivExt<'hir, 'tcx> {
     ) -> bool;
 }
 
-impl<'a, 'tcx> InferCtxtPrivExt<'a,'tcx> for InferCtxt<'a, 'tcx> {
+impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> {
     // returns if `cond` not occurring implies that `error` does not occur - i.e., that
     // `error` occurring implies that `cond` occurs.
     fn error_implies(&self, cond: ty::Predicate<'tcx>, error: ty::Predicate<'tcx>) -> bool {

compiler/rustc_trait_selection/src/traits/structural_match.rs

@@ -119,7 +119,7 @@ struct Search<'a, 'tcx> {
     seen: FxHashSet<hir::def_id::DefId>,
 }
 
-impl<'a,'tcx> Search<'a, 'tcx> {
+impl<'a, 'tcx> Search<'a, 'tcx> {
     fn tcx(&self) -> TyCtxt<'tcx> {
         self.infcx.tcx
     }

compiler/rustc_trait_selection/src/traits/util.rs

@@ -291,7 +291,10 @@ pub fn upcast_choices<'tcx>(
 /// Given a trait `trait_ref`, returns the number of vtable entries
 /// that come from `trait_ref`, excluding its supertraits. Used in
 /// computing the vtable base for an upcast trait of a trait object.
-pub fn count_own_vtable_entries<'tcx>(tcx: TyCtxt<'tcx>, trait_ref: ty::PolyTraitRef<'tcx>) -> usize {
+pub fn count_own_vtable_entries<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    trait_ref: ty::PolyTraitRef<'tcx>,
+) -> usize {
     let existential_trait_ref =
         trait_ref.map_bound(|trait_ref| ty::ExistentialTraitRef::erase_self_ty(tcx, trait_ref));
     let existential_trait_ref = tcx.erase_regions(existential_trait_ref);