undo := DisablePlatformSources()
	defer undo()

	loc, err := LoadLocation("Asia/Shanghai")
	if err != nil {
		t.Fatal(err)
	}

	tests := [...]struct {
		give Time
		want Time
	}{
		// 14 Apr 1991 - Daylight Saving Time Started
		// When time of "Asia/Shanghai" was about to reach
		// Sunday, 14 April 1991, 02:00:00 clocks were turned forward 1 hour to

	flag.BoolVar(&t.asan, "asan", false, "run in address sanitizer builder mode")
	flag.BoolVar(&t.json, "json", false, "report test results in JSON")

	xflagparse(-1) // any number of args
	if noRebuild {
		t.rebuild = false
	}

	t.run()
}

// tester executes cmdtest.
type tester struct {
	race        bool
	msan        bool
	asan        bool
	listMode    bool
	rebuild     bool

		suffix = *flagInstallSuffix
	} else if *flagRace {
		suffixsep = "_"
		suffix = "race"
	} else if *flagMsan {
		suffixsep = "_"
		suffix = "msan"
	} else if *flagAsan {
		suffixsep = "_"
		suffix = "asan"
	}

	if buildcfg.GOROOT != "" {
		Lflag(ctxt, filepath.Join(buildcfg.GOROOT, "pkg", fmt.Sprintf("%s_%s%s%s", buildcfg.GOOS, buildcfg.GOARCH, suffixsep, suffix)))
	}

	mayberemoveoutfile()

	// It's possible for any malloc to trigger sweeping, which may in
	// turn queue finalizers. Record this dynamic lock edge.
	lockRankMayQueueFinalizer()

	userSize := size
	if asanenabled {
		// Refer to ASAN runtime library, the malloc() function allocates extra memory,
		// the redzone, around the user requested memory region. And the redzones are marked

			// Tell msan that this entire span is no longer in use.
			base := unsafe.Pointer(s.base())
			bytes := s.npages << _PageShift
			msanfree(base, bytes)
		}
		if asanenabled {
			// Tell asan that this entire span is no longer in use.
			base := unsafe.Pointer(s.base())
			bytes := s.npages << _PageShift
			asanpoison(base, bytes)
		}
		h.freeSpanLocked(s, spanAllocHeap)
		unlock(&h.lock)
	})