log.Fatalf("print error: %s", err)
	}
}

// cannot initialize in init because (printer) Fprint launches goroutines.
func initialize() {
	const filename = "testdata/parser.go"

	src, err := os.ReadFile(filename)
	if err != nil {
		log.Fatalf("%s", err)
	}

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

	// file set fset.
	funcAST, fset := parseFunc("example_test.go", "printSelf")

	// Print the function body into buffer buf.
	// The file set is provided to the printer so that it knows
	// about the original source formatting and can add additional
	// line breaks where they were present in the source.
	var buf bytes.Buffer
	printer.Fprint(&buf, fset, funcAST.Body)

		if tokenclass(got) == literal && lit == "" {
			t.Errorf("%s: for %s got empty literal string", fset.Position(pos), got)
		}
	}
}

func BenchmarkScan(b *testing.B) {
	b.StopTimer()
	fset := token.NewFileSet()
	file := fset.AddFile("", fset.Base(), len(source))
	var s Scanner
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		s.Init(file, source, nil, ScanComments)
		for {
			_, tok, _ := s.Scan()

	t.Run("AllMethods", func(t *testing.T) { test(t, AllMethods) })
}

func TestFuncs(t *testing.T) {
	fset := token.NewFileSet()
	file, err := parser.ParseFile(fset, "funcs.go", strings.NewReader(funcsTestFile), parser.ParseComments)
	if err != nil {
		t.Fatal(err)
	}
	doc, err := NewFromFiles(fset, []*ast.File{file}, "importPath", Mode(0))
	if err != nil {
		t.Fatal(err)
	}

	for _, f := range doc.Funcs {

// errorfMinArgCount arguments (otherwise we should use check.error)
// and use balanced parentheses/brackets.
func TestErrorCalls(t *testing.T) {
	fset := token.NewFileSet()
	files, err := pkgFiles(fset, ".")
	if err != nil {
		t.Fatal(err)
	}

	for _, file := range files {
		ast.Inspect(file, func(n ast.Node) bool {
			call, _ := n.(*ast.CallExpr)
			if call == nil {
				return true

// as a Go source file, declaration, or statement list.
func parse(fset *token.FileSet, filename string, src []byte, fragmentOk bool) (
	file *ast.File,
	sourceAdj func(src []byte, indent int) []byte,
	indentAdj int,
	err error,
) {
	// Try as whole source file.
	file, err = parser.ParseFile(fset, filename, src, parserMode)

// as a Go source file, declaration, or statement list.
func parse(fset *token.FileSet, filename string, src []byte, fragmentOk bool) (
	file *ast.File,
	sourceAdj func(src []byte, indent int) []byte,
	indentAdj int,
	err error,
) {
	// Try as whole source file.
	file, err = parser.ParseFile(fset, filename, src, parserMode)

func Source(src []byte) ([]byte, error) {
	fset := token.NewFileSet()
	file, sourceAdj, indentAdj, err := parse(fset, "", src, true)
	if err != nil {
		return nil, err
	}

	if sourceAdj == nil {
		// Complete source file.
		// TODO(gri) consider doing this always.
		ast.SortImports(fset, file)
	}

	return format(fset, file, sourceAdj, indentAdj, src, config)
}

	// src is the input that we want to tokenize.
	src := []byte("cos(x) + 1i*sin(x) // Euler")

	// Initialize the scanner.
	var s scanner.Scanner
	fset := token.NewFileSet()                      // positions are relative to fset
	file := fset.AddFile("", fset.Base(), len(src)) // register input "file"
	s.Init(file, src, nil /* no error handler */, scanner.ScanComments)

	identPosInfo IdentPositionInfo
	fset         *token.FileSet
	t            *testing.T
}

func (v *Visitor) Visit(node ast.Node) ast.Visitor {
	if ident, ok := node.(*ast.Ident); ok {
		if expectedPositions, ok := v.identPosInfo[ident.Name]; ok {
			gotMatch := false
			var errorMessage strings.Builder
			for caseIndex, expectedPos := range expectedPositions {
				actualPosition := v.fset.PositionFor(ident.Pos(), true)