add helper methods for accessing struct tail

compiler/rustc_trait_selection/src/solve/project_goals.rs

@@ -366,7 +366,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> {
                 }
 
                 ty::Adt(def, substs) if def.is_struct() => {
-                    match def.non_enum_variant().fields.raw.last() {
+                    match def.non_enum_variant().tail_opt() {
                         None => tcx.types.unit,
                         Some(field_def) => {
                             let self_ty = field_def.ty(tcx, substs);

compiler/rustc_trait_selection/src/solve/trait_goals.rs

@@ -398,12 +398,7 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
                         return Err(NoSolution);
                     }
 
-                    let tail_field = a_def
-                        .non_enum_variant()
-                        .fields
-                        .raw
-                        .last()
-                        .expect("expected unsized ADT to have a tail field");
+                    let tail_field = a_def.non_enum_variant().tail();
                     let tail_field_ty = tcx.type_of(tail_field.did);
 
                     let a_tail_ty = tail_field_ty.subst(tcx, a_substs);