// they are handled explicitly by funcBody.
		if !scope.isFunc {
			check.usage(scope)
		}
	}
}

// stmtContext is a bitset describing which
// control-flow statements are permissible,
// and provides additional context information
// for better error messages.
type stmtContext uint

const (
	// permissible control-flow statements
	breakOk stmtContext = 1 << iota
	continueOk
	fallthroughOk

	if cpu.profiling {
		return fmt.Errorf("cpu profiling already in use")
	}
	cpu.profiling = true
	runtime.SetCPUProfileRate(hz)
	go profileWriter(w)
	return nil
}

// readProfile, provided by the runtime, returns the next chunk of
// binary CPU profiling stack trace data, blocking until data is available.
// If profiling is turned off and all the profile data accumulated while it was

	badPrecString     = "%!(BADPREC)"
	noVerbString      = "%!(NOVERB)"
	invReflectString  = "<invalid reflect.Value>"
)

// State represents the printer state passed to custom formatters.
// It provides access to the [io.Writer] interface plus information about
// the flags and options for the operand's format specifier.
type State interface {
	// Write is the function to call to emit formatted output to be printed.

		return err
	}
	if err := c.hello(); err != nil {
		return err
	}
	_, _, err := c.cmd(250, "VRFY %s", addr)
	return err
}

// Auth authenticates a client using the provided authentication mechanism.
// A failed authentication closes the connection.
// Only servers that advertise the AUTH extension support this function.
func (c *Client) Auth(a Auth) error {
	if err := c.hello(); err != nil {

// the program crashes.
// SetMaxStack returns the previous setting.
// The initial setting is 1 GB on 64-bit systems, 250 MB on 32-bit systems.
// There may be a system-imposed maximum stack limit regardless
// of the value provided to SetMaxStack.
//
// SetMaxStack is useful mainly for limiting the damage done by
// goroutines that enter an infinite recursion. It only limits future
// stack growth.
func SetMaxStack(bytes int) int {

// Otherwise, it is a no-op.
func (a *action) describef(pos poser, format string, args ...interface{}) {
	if debug {
		a.desc = &actionDesc{pos, format, args}
	}
}

// An actionDesc provides information on an action.
// For debugging only.
type actionDesc struct {
	pos    poser
	format string
	args   []interface{}
}

// A Checker maintains the state of the type checker.

		if cookie, err := ParseSetCookie(line); err == nil {
			cookies = append(cookies, cookie)
		}
	}
	return cookies
}

// SetCookie adds a Set-Cookie header to the provided [ResponseWriter]'s headers.
// The provided cookie must have a valid Name. Invalid cookies may be
// silently dropped.
func SetCookie(w ResponseWriter, cookie *Cookie) {
	if v := cookie.String(); v != "" {
		w.Header().Add("Set-Cookie", v)

	Value Value
}

// Label provides details about a Label event.
type Label struct {
	// Label is the label applied to some resource.
	Label string

	// Resource is the resource to which this label should be applied.
	Resource ResourceID
}

// Range provides details about a Range event.
type Range struct {
	// Name is a human-readable name for the range.

	for _, entry := range entries {
		info, err := entry.Info()
		if err != nil {
			continue
		}
		fis = append(fis, info)
	}
	return fis, nil
}

// ReadDir provides a slice of fs.FileInfo entries corresponding
// to the overlaid files in the directory.
func ReadDir(dir string) ([]fs.FileInfo, error) {
	Trace("ReadDir", dir)
	dir = canonicalize(dir)

		return true
	}
	rune, _ := utf8.DecodeRuneInString(name[len(prefix):])
	return !unicode.IsLower(rune)
}

// playExample synthesizes a new *ast.File based on the provided
// file with the provided function body as the body of main.
func playExample(file *ast.File, f *ast.FuncDecl) *ast.File {
	body := f.Body

	if !strings.HasSuffix(file.Name.Name, "_test") {