c.Close()
				t.Fatalf("%s succeeded, want error", op)
			}
			if perr := parseDialError(err); perr != nil {
				t.Fatal(perr)
			}
			operr := err.(*OpError).Err
			aerr, ok := operr.(*AddrError)
			if !ok {
				t.Fatalf("OpError.Err is %T, want *AddrError", operr)
			}
			want := tt.lit
			if tt.lit == "" {
				want = tt.addr.IP.String()
			}
			if aerr.Addr != want {

	"io"
	"os"
	"os/exec"
	"regexp"
	"slices"
	"strings"
	"syscall"
	"testing"
	"time"
)

func toErrno(err error) (syscall.Errno, bool) {
	operr, ok := err.(*OpError)
	if !ok {
		return 0, false
	}
	syserr, ok := operr.Err.(*os.SyscallError)
	if !ok {
		return 0, false
	}
	errno, ok := syserr.Err.(syscall.Errno)
	if !ok {
		return 0, false
	}
	return errno, true
}

	c, s := localPipe(t)
	go func() {
		Client(c, testConfig).sendAlert(alertUnknownCA)
		c.Close()
	}()

	err := Server(s, testConfig).Handshake()
	s.Close()
	var opErr *net.OpError
	if !errors.As(err, &opErr) || opErr.Err != error(alertUnknownCA) {
		t.Errorf("Got error: %s; expected: %s", err, error(alertUnknownCA))
	}
}

func TestClose(t *testing.T) {
	c, s := localPipe(t)
	go c.Close()

	case 5: // syscall
		zI(op_SVC, 0, asm)

	case 6: // logical op reg [reg] reg
		var oprr, oprre, oprrf uint32
		switch p.As {
		case AAND:
			oprre = op_NGR
			oprrf = op_NGRK
		case AANDW:
			oprr = op_NR
			oprrf = op_NRK
		case AOR:
			oprre = op_OGR
			oprrf = op_OGRK
		case AORW:
			oprr = op_OR
			oprrf = op_ORK
		case AXOR:
			oprre = op_XGR
			oprrf = op_XGRK