Pacify tidy.

Author: cjgillot

compiler/rustc_infer/src/traits/engine.rs

@@ -43,7 +43,7 @@ pub trait TraitEngine<'tcx>: 'tcx {
     fn pending_obligations(&self) -> Vec<PredicateObligation<'tcx>>;
 
     /// Among all pending obligations, collect those are stalled on a inference variable which has
-    /// changed since the last call to `select_where_possible`.  Those obligations are marked as
+    /// changed since the last call to `select_where_possible`. Those obligations are marked as
     /// successful and returned.
     fn drain_unstalled_obligations(
         &mut self,

compiler/rustc_trait_selection/src/traits/query/normalize.rs

@@ -216,11 +216,11 @@ impl<'cx, 'tcx> FallibleTypeFolder<'tcx> for QueryNormalizer<'cx, 'tcx> {
                         let substs = substs.try_fold_with(self)?;
                         let recursion_limit = self.tcx().recursion_limit();
                         if !recursion_limit.value_within_limit(self.anon_depth) {
-                            // A closure or generator may have itself as in its upvars.  This
-                            // should be checked handled by the recursion check for opaque types,
-                            // but we may end up here before that check can happen.  In that case,
-                            // we delay a bug to mark the trip, and continue without revealing the
-                            // opaque.
+                            // A closure or generator may have itself as in its upvars.
+                            // This should be checked handled by the recursion check for opaque
+                            // types, but we may end up here before that check can happen.
+                            // In that case, we delay a bug to mark the trip, and continue without
+                            // revealing the opaque.
                             self.infcx
                                 .err_ctxt()
                                 .build_overflow_error(&ty, self.cause.span, true)

compiler/rustc_ty_utils/src/needs_drop.rs

@@ -110,8 +110,8 @@ where
             for component in components {
                 match *component.kind() {
                     // The information required to determine whether a generator has drop is
-                    // computed on MIR, while this very method is used to build MIR.  To avoid
-                    // cycles, we consider that generators always require drop.
+                    // computed on MIR, while this very method is used to build MIR.
+                    // To avoid cycles, we consider that generators always require drop.
                     ty::Generator(..) if tcx.sess.opts.unstable_opts.drop_tracking_mir => {
                         return Some(Err(AlwaysRequiresDrop));
                     }