return s
	}
	b := make([]byte, 0, len(s))
	for _, c := range s {
		if c < 0x80 && c != 0x00 {
			b = append(b, byte(c))
		}
	}
	return string(b)
}

type parser struct {
	err error // Last error seen
}

type formatter struct {
	err error // Last error seen
}

// parseString parses bytes as a NUL-terminated C-style string.
// If a NUL byte is not found then the whole slice is returned as a string.

</ul>

<p>
<a href="#Struct_types">Struct tags</a> are ignored when comparing struct types
for identity for the purpose of conversion:
</p>

<pre>
type Person struct {
	Name    string
	Address *struct {
		Street string
		City   string
	}
}

var data *struct {
	Name    string `json:"name"`
	Address *struct {
		Street string `json:"street"`
		City   string `json:"city"`

)

// ----------------------------------------------------------------------------
// API

// A Struct represents a struct type.
type Struct struct {
	fields []*Var   // fields != nil indicates the struct is set up (possibly with len(fields) == 0)
	tags   []string // field tags; nil if there are no tags
}

// NewStruct returns a new struct with the given fields and corresponding field tags.

// the text of the most recently returned token is, and where it was found.
// The underlying scanner elides all spaces except newline, so the input looks like a stream of
// Tokens; original spacing is lost but we don't need it.
type TokenReader interface {
	// Next returns the next token.
	Next() ScanToken
	// The following methods all refer to the most recent token returned by Next.

//         Tag     itag // interfaceType
//         Terms   []struct {
//             tilde bool
//             Type  typeOff
//         }
//     }
//
//
//
//     type Signature struct {
//         Params   []Param
//         Results  []Param
//         Variadic bool  // omitted if Results is empty
//     }
//
//     type Param struct {
//         Pos  Pos
//         Name stringOff

	"internal/testenv"
	"testing"
)

// findStructType typechecks src and returns the first struct type encountered.
func findStructType(t *testing.T, src string) *types2.Struct {
	return findStructTypeConfig(t, src, &types2.Config{})
}

func findStructTypeConfig(t *testing.T, src string, conf *types2.Config) *types2.Struct {
	types := make(map[syntax.Expr]types2.TypeAndValue)
	mustTypecheck(src, nil, &types2.Info{Types: types})

	{"type t[P any] struct{f P}", "t", "type p.t[P any] struct{f P}", false},
	{"type t[P any] struct{f P}", "t.P", "type parameter P any", false},
	{"type C interface{m()}; type t[P C] struct{}", "t.P", "type parameter P p.C", false},

	{"type t = struct{f int}", "t", "type p.t = struct{f int}", false},
	{"type t = func(int)", "t", "type p.t = func(int)", false},
	{"type A = B; type B = int", "A", "type p.A = p.B", true},

			cf.Var(cf.Lookup(name).Value, "test."+name, "")
		}
	}
}

// outputdirFlag implements the -outputdir flag.
// It interprets an empty value as the working directory of the 'go' command.
type outputdirFlag struct {
	abs string
}

func (f *outputdirFlag) String() string {
	return f.abs
}

func (f *outputdirFlag) Set(value string) (err error) {
	if value == "" {
		f.abs = ""
	} else {

		// collisions
		{"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
		{"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},

		// collisions on a generic type
		{"type ( E1[P any] struct{ f P }; E2[P any] struct{ f P }; x struct{ E1[int]; *E2[int] })", false, []int{1, 0}, false},

	return t.nextFlowID.Add(1)
}

// traceKey is the context key for tracing information. It is unexported to prevent collisions with context keys defined in
// other packages.
type traceKey struct{}

type traceContext struct {
	t   *tracer
	tid uint64
}

// Start starts a trace which writes to the given file.
func Start(ctx context.Context, file string) (context.Context, func() error, error) {