return true
	}
	if rn.Class != ir.PEXTERN || rn.Sym().Pkg != types.LocalPkg {
		return false
	}
	if rn.Defn == nil {
		// No explicit initialization value. Probably zeroed but perhaps
		// supplied externally and of unknown value.
		return false
	}
	if rn.Defn.Op() != ir.OAS {
		return false
	}
	if rn.Type().IsString() { // perhaps overwritten by cmd/link -X (#34675)
		return false
	}

		n.X = Expr(n.X)
		return n

	// statements
	case ir.OAS:
		n := n.(*ir.AssignStmt)
		tcAssign(n)

		// Code that creates temps does not bother to set defn, so do it here.
		if n.X.Op() == ir.ONAME && ir.IsAutoTmp(n.X) {
			n.X.Name().Defn = n
		}
		return n

	case ir.OAS2:
		tcAssignList(n.(*ir.AssignListStmt))
		return n

	case ir.OBREAK,
		ir.OCONTINUE,
		ir.ODCL,
		ir.OGOTO,

		clo.Func.RangeParent = outerfn
		if outerfn.OClosure != nil && outerfn.OClosure.Func.RangeParent != nil {
			clo.Func.RangeParent = outerfn.OClosure.Func.RangeParent
		}
	}
	fn.OClosure = clo

	fn.Nname.Defn = fn
	pkg.Funcs = append(pkg.Funcs, fn)

	return fn
}

// IsFuncPCIntrinsic returns whether n is a direct call of internal/abi.FuncPCABIxxx functions.
func IsFuncPCIntrinsic(n *CallExpr) bool {

`
	const want = `L3 defs func p._()
L4 defs const w untyped int
L5 defs var x int
L5 defs var y int
L6 defs var z int
L6 uses const w untyped int
L6 uses var x int
L7 uses var x int
L7 uses var y int
L7 uses var z int`

	// don't abort at the first error
	conf := Config{Error: func(err error) { t.Log(err) }}
	defs := make(map[*syntax.Name]Object)
	uses := make(map[*syntax.Name]Object)

	if b.gccSupportsFlag(compiler, "-ffile-prefix-map=a=b") {
		defs = append(defs, "-ffile-prefix-map="+base.Cwd()+"=.")
		defs = append(defs, "-ffile-prefix-map="+b.WorkDir+"=/tmp/go-build")
	} else if b.gccSupportsFlag(compiler, "-fdebug-prefix-map=a=b") {
		defs = append(defs, "-fdebug-prefix-map="+b.WorkDir+"=/tmp/go-build")
	}
	if b.gccSupportsFlag(compiler, "-gno-record-gcc-switches") {

				continue
			}
			if s.OnList() {
				panic("a symbol is added to defs multiple times")
			}
			s.PkgIdx = goobj.PkgIdxSelf
			s.SymIdx = symidx
			s.Set(AttrIndexed, true)
			s.Set(AttrOnList, true)
			symidx++
			infosyms = append(infosyms, s)
		}
	}
	ctxt.defs = append(ctxt.defs, infosyms...)
}

func writeAuxSymDebug(ctxt *Link, par *LSym, aux *LSym) {

                   "defs argument",
                   i);
      return nullptr;
    }

    // Parse op def from character array.
    tensorflow::OpDef opdef;
    if (!tensorflow::protobuf::TextFormat::ParseFromString(tf_opdefs, &opdef)) {
      PyErr_Format(
          PyExc_ValueError,
          "Failed to parse opdefs at index %d of custom op defs argument: %s",
          i, tf_opdefs);

    ref: Optional[str] = Field(default=None, alias="$ref")
    dynamicRef: Optional[str] = Field(default=None, alias="$dynamicRef")
    defs: Optional[Dict[str, "SchemaOrBool"]] = Field(default=None, alias="$defs")
    comment: Optional[str] = Field(default=None, alias="$comment")
    # Ref: JSON Schema 2020-12: https://json-schema.org/draft/2020-12/json-schema-core.html#name-a-vocabulary-for-applying-s

	n := syntax.NewName(pos, name)
	tv := syntax.TypeAndValue{Type: typ}
	tv.SetIsValue()
	n.SetTypeInfo(tv)
	r.info.Defs[n] = obj
	return obj, n
}

func (r *rewriter) generateParamName(results []*syntax.Field, i int) {
	obj, n := r.sig.RenameResult(results, i)
	r.info.Defs[n] = obj
}

// declVar declares a variable with a given name type and initializer value.

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>Hoặc sử dụng <code>async def</code>...</summary>

Nếu code của bạn sử dụng `async` / `await`, hãy sử dụng `async def`:

```Python hl_lines="9  14"