dialCtx := ctx
		if deadline, hasDeadline := ctx.Deadline(); hasDeadline {
			partialDeadline, err := partialDeadline(time.Now(), deadline, len(ras)-i)
			if err != nil {
				// Ran out of time.
				if firstErr == nil {
					firstErr = &OpError{Op: "dial", Net: sd.network, Source: sd.LocalAddr, Addr: ra, Err: err}
				}
				break
			}
			if partialDeadline.Before(deadline) {
				var cancel context.CancelFunc

		{now.Add(0 * time.Millisecond), now, 1, noDeadline, errTimeout},
		{now.Add(1 * time.Millisecond), now, 1, noDeadline, errTimeout},
	}
	for i, tt := range testCases {
		deadline, err := partialDeadline(tt.now, tt.deadline, tt.addrs)
		if err != tt.expectErr {
			t.Errorf("#%d: got %v; want %v", i, err, tt.expectErr)
		}
		if !deadline.Equal(tt.expectDeadline) {