package testtrace

import (
	"bytes"
	"fmt"
	"internal/trace/raw"
	"internal/txtar"
	"io"
)

// ParseFile parses a test file generated by the testgen package.
func ParseFile(testPath string) (io.Reader, *Expectation, error) {
	ar, err := txtar.ParseFile(testPath)
	if err != nil {
		return nil, nil, fmt.Errorf("failed to read test file for %s: %v", testPath, err)
	}
	if len(ar.Files) != 2 {

  // Parse the schemas
  flatbuffers::Parser base_parser, current_parser;
  std::vector<const char *> include_directories;
  ASSERT_TRUE(ParseFile(&base_parser, base_filename, base_contents));
  ASSERT_TRUE(ParseFile(&current_parser, current_filename, current_contents));
  // Check that the schemas conform and fail if they don't
  auto err = current_parser.ConformTo(base_parser);
  if (!err.empty()) {

	src := `
package p
const c = 1.0
var X = f(3.14)*2 + c
`

	// Create the AST by parsing src.
	fset := token.NewFileSet() // positions are relative to fset
	f, err := parser.ParseFile(fset, "src.go", src, 0)
	if err != nil {
		panic(err)
	}

	// Inspect the AST and print all identifiers and literals.
	ast.Inspect(f, func(n ast.Node) bool {
		var s string
		switch x := n.(type) {

		return err
	}

	file, err := parser.ParseFile(fset, filename, src, parserMode)
	if err != nil {
		return err
	}

	// Make sure file is in canonical format.
	// This "fmt" pseudo-fix cannot be disabled.
	newSrc, err := gofmtFile(file)
	if err != nil {
		return err
	}
	if !bytes.Equal(newSrc, src) {
		newFile, err := parser.ParseFile(fset, filename, newSrc, parserMode)
		if err != nil {

	// bug, this test failed with a runtime panic.
	src := "package p\ntype T struct {\n\tF int `json:\"f\"` // a field\n}\n"

	fset := token.NewFileSet()
	f, err := parser.ParseFile(fset, "", src, 0)
	if err != nil {
		panic(err)
	}

	for n := range ast.Preorder(f) {
		if id, ok := n.(*ast.Ident); ok && id.Name == "F" {
			break
		}
	}

	less []string
	op   string // Either "<" or "!<"
	def  []string
}

type syntaxError string

func (e syntaxError) Error() string {
	return string(e)
}

// parseRules parses the rules of a DAG.
func parseRules(rules string) (out []rule, err error) {
	defer func() {
		e := recover()
		switch e := e.(type) {
		case nil:
			return
		case syntaxError:
			err = e
		default:
			panic(e)

)

// registerAmbient registers a variable that is allowed only if EnableAmbient is set
func registerAmbient[T env.Parseable](name string, defaultWithAmbient, defaultWithoutAmbient T, description string) T {
	if EnableAmbient {
		return env.Register(name, defaultWithAmbient, description).Get()
	}

	//     setting caused by os.Setenv("GODEBUG"), as happens in
	//     many tests. Therefore any attempt to cache the result
	//     is just incorrect.
	fset := token.NewFileSet()
	f, _ := parser.ParseFile(fset, "a.go", "package p; type A = int", 0)
	pkg, _ := new(types.Config).Check("p", fset, []*ast.File{f}, nil)
	_, enabled := pkg.Scope().Lookup("A").Type().(*types.Alias)
	return enabled

		testName, err := filepath.Rel("./testdata", testPath)
		if err != nil {
			t.Fatalf("failed to relativize testdata path: %v", err)
		}
		t.Run(testName, func(t *testing.T) {
			tr, exp, err := testtrace.ParseFile(testPath)
			if err != nil {
				t.Fatalf("failed to parse test file at %s: %v", testPath, err)
			}
			testReader(t, tr, exp)
		})
	}
}

func FuzzReader(f *testing.F) {

			type R interface {} // must not shadow R in first line of this function body
		}
		`,
	}

	fset := token.NewFileSet()
	var files []*ast.File
	for i, src := range sources {
		file, err := parser.ParseFile(fset, "p", src, parser.ParseComments)
		if err != nil {
			t.Fatalf("could not parse file %d: %s", i, err)
		}

		// Materialized aliases give a different (better)