func (l <esc:0x32> <type 24>) .time.lookup (sec <type -4>) (name <type -16>, offset <type -11>, isDST <type -15>, start <type -4>, end <type -4>);
 func (l <esc:0x1> <type 24>) .time.lookupName (name <esc:0x1> <type -16>, unix <type -4>) (offset <type -11>, ok <type -15>);
 func (l <esc:0x1> <type 24>) .time.firstZoneUsed () <type -15>;
>>; }>
 func (t <esc:0x12> <type 12>) In (loc <type 14>) <type 12>;

 func (l <type 15>) .time.lookupFirstZone () <type -11>;
 func (l <type 15>) .time.firstZoneUsed () <type -15>;
 func (l <type 15>) .time.lookupName (name <type -16>, unix <type -4>) (offset <type -11>, isDST <type -15>, ok <type -15>);
>>; }>
 func (t <type 3>) String () <type -16>;
 func (t <type 3>) Format (layout <type -16>) <type -16>;

	}
	cache.mu.Lock()
	defer cache.mu.Unlock()

	switch T := aliases.Unalias(T).(type) {
	case *types.Named:
		return cache.lookupNamed(T).value

	case *types.Pointer:
		if N, ok := aliases.Unalias(T.Elem()).(*types.Named); ok {
			return cache.lookupNamed(N).pointer
		}
	}

	// all other types
	// (The map uses pointer equivalence, not type identity.)
	mset := cache.others[T]
	if mset == nil {

			if port, err := goLookupPort(network, service); err == nil {
				return port, nil
			}
		}
		return port, err
	}
	return goLookupPort(network, service)
}

func (r *Resolver) lookupCNAME(ctx context.Context, name string) (string, error) {
	order, conf := systemConf().hostLookupOrder(r, name)
	if order == hostLookupCgo {
		if cname, err, ok := cgoLookupCNAME(ctx, name); ok {
			return cname, err
		}
	}

		}
	})
}

func TestNSLookupCNAME(t *testing.T) {
	testenv.MustHaveExternalNetwork(t)

	testLookup(t, func(t *testing.T, r *Resolver, server string) {
		cname, err := r.LookupCNAME(context.Background(), server)
		if err != nil {
			t.Fatalf("failed %s: %s", server, err)
		}
		if cname == "" {
			t.Fatalf("no result %s", server)
		}
		expected, err := nslookupCNAME(server)
		if err != nil {