func add(x, y int) int {
	return x + y
}

func fn() func(int, int) int {
	return f
}

var fc func(int, int, chan int)

func addc(x, y int, c chan int) {
	c <- x+y
}

func fnc() func(int, int, chan int) {
	return fc
}

func three(x int) {
	if x != 3 {
		println("wrong val", x)
		panic("fail")
	}
}

var notmain func()

func emptyresults() {}
func noresults()    {}

// license that can be found in the LICENSE file.

// Test closures in if conditions.

package main

func main() {
	if func() bool { return true }() {}  // gc used to say this was a syntax error
	if (func() bool { return true })() {}
	if (func() bool { return true }()) {}

	}
	funct2 |= enc.funct7
	if funct2&^3 != 0 {
		panic("encodeR4: funct2 requires more than 2 bits")
	}
	return rs3<<27 | funct2<<25 | rs2<<20 | rs1<<15 | enc.funct3<<12 | funct3<<12 | rd<<7 | enc.opcode
}

func encodeRII(ins *instruction) uint32 {
	return encodeR(ins.as, regI(ins.rs1), 0, regI(ins.rd), ins.funct3, ins.funct7)
}

func encodeRIII(ins *instruction) uint32 {

	return m
}

// addValueFuncs adds to values the functions in funcs, converting them to reflect.Values.
func addValueFuncs(out map[string]reflect.Value, in FuncMap) {
	for name, fn := range in {
		if !goodName(name) {
			panic(fmt.Errorf("function name %q is not a valid identifier", name))
		}
		v := reflect.ValueOf(fn)
		if v.Kind() != reflect.Func {
			panic("value for " + name + " not a function")
		}

// Verify that illegal function signatures are detected.
// Does not compile.

package main

type t1 int
type t2 int
type t3 int

func f1(*t2, x t3)	// ERROR "named"
func f2(t1, *t2, x t3)	// ERROR "named"
func f3() (x int, *string)	// ERROR "named"

// license that can be found in the LICENSE file.

// Verify that it is illegal to take the address of a function.
// Does not compile.

package main

var notmain func()

func main() {
	var x = &main		// ERROR "address of|invalid"
	main = notmain	// ERROR "assign to|invalid"
	_ = x

// license that can be found in the LICENSE file.

// Test evaluation order in if condition.

package main

var calledf = false

func f() int {
	calledf = true
	return 1
}

func g() int {
	if !calledf {
		panic("BUG: func7 - called g before f")
	}
	return 0
}

func main() {
	// gc used to evaluate g() before f().
	if f() < g() {
		panic("wrong answer")
	}

bool HasTfSavedModelSemantics(ModuleOp module_op);

// Returns the tf_saved_model.global_tensor op that func's arg_index'th argument
// refers to as a bound input, or null.
Operation *LookupBoundInput(func::FuncOp func, int arg_index,
                            const SymbolTable &symbol_table);

template <typename T>
T LookupBoundInputOfType(func::FuncOp func, int arg_index,
                         const SymbolTable &symbol_table) {

package main

type t1 int
type t2 int
type t3 int

func f1(t1, t2, t3)
func f2(t1, t2, t3 bool)
func f3(t1, t2, x t3)
func f4(t1, *t3)
func (x *t1) f5(y []t2) (t1, *t3)
func f6() (int, *string)
func f7(*t2, t3)
func f8(os int) int

func f9(os int) int {
	return os
}
func f10(err error) error {
	return err
}
func f11(t1 string) string {
	return t1

    Talvez você precise inicializar uma nova versão, ou apenas cansou de executá-la. 🤷

### Função _lifespan_

A primeira coisa a notar, é que estamos definindo uma função assíncrona com `yield`. Isso é muito semelhante à Dependências com `yield`.

```Python hl_lines="14-19"
{!../../../docs_src/events/tutorial003.py!}
```

A primeira parte da função, antes do `yield`, será  executada **antes** da aplicação inicializar.