}

// WritableFile that simply concats into string.
class StringWritableFile : public WritableFile {
 public:
  explicit StringWritableFile(string* str) : str_(*str) {}

  Status Append(StringPiece data) override {
    absl::StrAppend(&str_, data);
    return absl::OkStatus();
  }

  Status Close() override { return absl::OkStatus(); }

  Status Flush() override { return absl::OkStatus(); }

	LeaseEndpointReconcilerType,
	NoneEndpointReconcilerType,
}

// Names returns a slice of all the reconciler names
func (t Types) Names() []string {
	strs := make([]string, len(t))
	for i, v := range t {
		strs[i] = string(v)
	}
	return strs

	}

	// Look for the expected things in the coverage profile.
	contents, err := os.ReadFile(textfile)
	strc := string(contents)
	if err != nil {
		t.Fatalf("problems reading text file %s: %v", textfile, err)
	}
	if !strings.Contains(strc, token) {
		t.Logf("content: %s\n", string(contents))
		t.Fatalf("cov profile does not contain aux meta content %q", token)
	}

		{Name: "v7atomics", Feature: &ARM.HasV7Atomics},
	}

	// HWCAP feature bits
	ARM.HasVFPv4 = isSet(HWCap, hwcap_VFPv4)
	ARM.HasIDIVA = isSet(HWCap, hwcap_IDIVA)
	// lpae is required to make the 64-bit instructions LDRD and STRD (and variants) atomic.
	// See ARMv7 manual section B1.6.
	// We also need at least a v7 chip, for the DMB instruction.
	ARM.HasV7Atomics = isSet(HWCap, hwcap_LPAE) && isV7(Platform)
}

	benchmarkSwitchInterfaceType(b, false)
}

type SI0 interface {
	si0()
}
type ST0 struct {
}

func (ST0) si0() {
}

type SI1 interface {
	si1()
}
type ST1 struct {
}

func (ST1) si1() {
}

type SI2 interface {
	si2()
}
type ST2 struct {
}

func (ST2) si2() {
}

type SI3 interface {
	si3()
}
type ST3 struct {
}

Special Cases.

(1) Argument order is the same as in the GNU ARM64 syntax: cbz, cbnz and some store instructions,
such as str, stur, strb, sturb, strh, sturh stlr, stlrb. stlrh, st1.

Examples:

	MOVD R29, 384(R19)    <=>    str x29, [x19,#384]
	MOVB.P R30, 30(R4)    <=>    strb w30, [x4],#30
	STLRH R21, (R19)      <=>    stlrh w21, [x19]

```

由于我们必须用 `Query(default=None)` 替换默认值 `None`，`Query` 的第一个参数同样也是用于定义默认值。

所以：

```Python
q: Union[str, None] = Query(default=None)
```

...使得参数可选，等同于：

```Python
q: str = None
```

但是 `Query` 显式地将其声明为查询参数。

然后，我们可以将更多的参数传递给 `Query`。在本例中，适用于字符串的 `max_length` 参数：

```Python
q: Union[str, None] = Query(default=None, max_length=50)
```

将会校验数据，在数据无效时展示清晰的错误信息，并在 OpenAPI 模式的*路径操作*中记录该参​​数。

```Python hl_lines="9"
{!../../../docs_src/query_params_str_validations/tutorial001.py!}
```

쿼리 매개변수 `q`는 `Optional[str]` 자료형입니다. 즉, `str` 자료형이지만 `None` 역시 될 수 있음을 뜻하고, 실제로 기본값은 `None`이기 때문에 FastAPI는 이 매개변수가 필수가 아니라는 것을 압니다.

!!! note "참고"
    FastAPI는 `q`의 기본값이 `= None`이기 때문에 필수가 아님을 압니다.

    `Optional[str]`에 있는 `Optional`은 FastAPI가 사용하는게 아니지만, 편집기에게 더 나은 지원과 오류 탐지를 제공하게 해줍니다.

## 추가 검증

// RUN: tf-mlir-translate -mlir-tf-mlir-to-str-attr -mlir-print-local-scope %s | FileCheck %s

module attributes {tf.versions = {producer = 888 : i32}} {
  func.func @main(%arg0: tensor<?xi32>) -> tensor<?xi32> {
    %0 = "tf.Identity"(%arg0) : (tensor<?xi32>) -> tensor<?xi32> loc(unknown)
    func.return %0 : tensor<?xi32> loc(unknown)
  } loc(unknown)
} loc(unknown)

	s := Collect(testSeq)
	want := testSeqResult
	if !Equal(s, want) {
		t.Errorf("got %v, want %v", s, want)
	}
}

var iterTests = [][]string{
	nil,
	{"a"},
	{"a", "b"},
	{"b", "a"},
	strs[:],
}

func TestValuesAppendSeq(t *testing.T) {
	for _, prefix := range iterTests {
		for _, s := range iterTests {
			got := AppendSeq(prefix, Values(s))
			want := append(prefix, s...)