# go env -w/-u checks validity of GOOS/ARCH combinations
env GOOS=
env GOARCH=
# check -w doesn't allow invalid GOOS
! go env -w GOOS=linuxx
stderr 'unsupported GOOS/GOARCH pair linuxx'
# check -w doesn't allow invalid GOARCH
! go env -w GOARCH=amd644
stderr 'unsupported GOOS/GOARCH.*/amd644$'
# check -w doesn't allow invalid GOOS with valid GOARCH
! go env -w GOOS=linuxx GOARCH=amd64

func TestCgoCallbackGC(t *testing.T) {
	t.Parallel()
	switch runtime.GOOS {
	case "plan9", "windows":
		t.Skipf("no pthreads on %s", runtime.GOOS)
	}
	if testing.Short() {
		switch {
		case runtime.GOOS == "dragonfly":
			t.Skip("see golang.org/issue/11990")
		case runtime.GOOS == "linux" && runtime.GOARCH == "arm":
			t.Skip("too slow for arm builders")
		case runtime.GOOS == "linux" && (runtime.GOARCH == "mips64" || runtime.GOARCH == "mips64le"):

#
# * syscall_${GOOS}.go
#
# This hand-written Go file implements system calls that need
# special handling and lists "//sys" comments giving prototypes
# for ones that can be auto-generated.  Mksyscall reads those
# comments to generate the stubs.
#
# * syscall_${GOOS}_${GOARCH}.go
#
# Same as syscall_${GOOS}.go except that it contains code specific
# to ${GOOS} on one particular architecture.
#

	testenv.MustHaveGoBuild(t)
	testenv.MustHaveCGO(t)
	goos, err := goEnv("GOOS")
	if err != nil {
		t.Fatal(err)
	}
	goarch, err := goEnv("GOARCH")
	if err != nil {
		t.Fatal(err)
	}
	// The asan tests require support for the -asan option.
	if !platform.ASanSupported(goos, goarch) {
		t.Skipf("skipping on %s/%s; -asan option is not supported.", goos, goarch)
	}

		if tc.sanitizer == "memory" && !platform.MSanSupported(GOOS, GOARCH) {
			t.Logf("skipping %s test on %s/%s; -msan option is not supported.", name, GOOS, GOARCH)
			continue
		}
		if tc.sanitizer == "thread" && !compilerRequiredTsanVersion(GOOS, GOARCH) {
			t.Logf("skipping %s test on %s/%s; compiler version too old for -tsan.", name, GOOS, GOARCH)
			continue
		}

		t.Run(name, func(t *testing.T) {

	//
	// The CloseNotifier interface is implemented by ResponseWriters which allow detecting
	// when the underlying connection has gone away.
	// Deprecated: the CloseNotifier interface predates Go's context package.
	// New code should use Request.Context instead.
	inner := decorator.Unwrap()
	if innerNotifierFlusher, ok := inner.(CloseNotifierFlusher); ok {

type argvalues struct {
	osargs []string
	goos   string
	goarch string
}

type argstate struct {
	state       argvalues
	initialized bool
}

func (a *argstate) Merge(state argvalues) {
	if !a.initialized {
		a.state = state
		a.initialized = true
		return
	}
	if !slices.Equal(a.state.osargs, state.osargs) {
		a.state.osargs = nil
	}
	if state.goos != a.state.goos {
		a.state.goos = ""
	}

	return nil, fmt.Errorf("terminal: MakeRaw not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
}

func getState(fd int) (*State, error) {
	return nil, fmt.Errorf("terminal: GetState not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
}

func restore(fd int, state *State) error {
	return fmt.Errorf("terminal: Restore not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
}

func getSize(fd int) (width, height int, err error) {

	return nil, fmt.Errorf("terminal: MakeRaw not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
}

func getState(fd int) (*State, error) {
	return nil, fmt.Errorf("terminal: GetState not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
}

func restore(fd int, state *State) error {
	return fmt.Errorf("terminal: Restore not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
}

func getSize(fd int) (width, height int, err error) {

	}
}

func TestIsWindowsUNCPath(t *testing.T) {
	tests := []struct {
		goos      string
		path      string
		isUNCPath bool
	}{
		{
			goos:      "linux",
			path:      `/usr/bin`,
			isUNCPath: false,
		},
		{
			goos:      "linux",
			path:      `\\.\pipe\foo`,
			isUNCPath: false,
		},
		{
			goos:      "windows",
			path:      `C:\foo`,
			isUNCPath: false,
		},
		{