Dejargnonize subst

compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs

@@ -557,7 +557,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             obligation.predicate.def_id(),
             obligation.predicate.skip_binder().trait_ref.self_ty(),
             |impl_def_id| {
-                // Before we create the substitutions and everything, first
+                // Before we create the generic parameters and everything, first
                 // consider a "quick reject". This avoids creating more types
                 // and so forth that we need to.
                 let impl_trait_ref = self.tcx().impl_trait_ref(impl_def_id).unwrap();