Add built-in const impls for Clone and Copy

compiler/rustc_next_trait_solver/src/solve/effect_goals.rs

@@ -211,10 +211,32 @@ where
     }
 
     fn consider_builtin_copy_clone_candidate(
-        _ecx: &mut EvalCtxt<'_, D>,
-        _goal: Goal<I, Self>,
+        ecx: &mut EvalCtxt<'_, D>,
+        goal: Goal<I, Self>,
     ) -> Result<Candidate<I>, NoSolution> {
-        Err(NoSolution)
+        let cx = ecx.cx();
+
+        let self_ty = goal.predicate.self_ty();
+        let constituent_tys =
+            structural_traits::instantiate_constituent_tys_for_copy_clone_trait(ecx, self_ty)?;
+
+        ecx.probe_builtin_trait_candidate(BuiltinImplSource::Misc).enter(|ecx| {
+            ecx.enter_forall(constituent_tys, |ecx, tys| {
+                ecx.add_goals(
+                    GoalSource::ImplWhereBound,
+                    tys.into_iter().map(|ty| {
+                        goal.with(
+                            cx,
+                            ty::ClauseKind::HostEffect(
+                                goal.predicate.with_replaced_self_ty(cx, ty),
+                            ),
+                        )
+                    }),
+                );
+            });
+
+            ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
+        })
     }
 
     fn consider_builtin_fn_ptr_trait_candidate(