const src = `// comment 1
	// comment 2
	// comment 3
	package main
	`

	fset := token.NewFileSet()
	f, err := parser.ParseFile(fset, "", src, parser.ParseComments)
	if err != nil {
		panic(err) // error in test
	}

	var buf bytes.Buffer
	fset = token.NewFileSet() // use the wrong file set
	Fprint(&buf, fset, f)

	nlines := 0
	for _, ch := range buf.Bytes() {
		if ch == '\n' {
			nlines++

	}

	imports := make(map[string]*types.Package)
	fset := token.NewFileSet()
	_, err := Import(fset, imports, "net/http", ".", nil)
	if err != nil {
		t.Fatal(err)
	}

	mutex := imports["sync"].Scope().Lookup("Mutex").(*types.TypeName).Type()
	mset := types.NewMethodSet(types.NewPointer(mutex)) // methods of *sync.Mutex
	sel := mset.Lookup(nil, "Lock")
	lock := sel.Obj().(*types.Func)

.*have M5[(]struct{b[.]S; b[.]t}[)]
.*want M5[(]struct{b[.]S; t}[)]`},
	}

	fset := token.NewFileSet()
	test := func(main, b, want string) {
		re := regexp.MustCompile(want)
		bpkg := mustTypecheck(b, nil, nil)
		mast := mustParse(fset, main)
		conf := Config{Importer: importHelper{pkg: bpkg}}
		_, err := conf.Check(mast.Name.Name, fset, []*ast.File{mast}, nil)
		if err == nil {
			t.Error("Expected failure, but it did not")

func (p *Package) annotateFile(name string, fd io.Writer) {
	fset := token.NewFileSet()
	content, err := os.ReadFile(name)
	if err != nil {
		log.Fatalf("cover: %s: %s", name, err)
	}
	parsedFile, err := parser.ParseFile(fset, name, content, parser.ParseComments)
	if err != nil {
		log.Fatalf("cover: %s: %s", name, err)
	}

	file := &File{
		fset:    fset,
		name:    name,
		content: content,

func checkCopyLocksAssign(pass *analysis.Pass, as *ast.AssignStmt) {
	for i, x := range as.Rhs {
		if path := lockPathRhs(pass, x); path != nil {
			pass.ReportRangef(x, "assignment copies lock value to %v: %v", analysisutil.Format(pass.Fset, as.Lhs[i]), path)
		}
	}
}

// checkCopyLocksGenDecl checks whether lock is copied
// in variable declaration.
func checkCopyLocksGenDecl(pass *analysis.Pass, gd *ast.GenDecl) {
	if gd.Tok != token.VAR {

)

var fset = token.NewFileSet()

func parseFiles(t *testing.T, filenames []string, srcs [][]byte, mode parser.Mode) ([]*ast.File, []error) {
	var files []*ast.File
	var errlist []error
	for i, filename := range filenames {
		file, err := parser.ParseFile(fset, filename, srcs[i], mode)
		if file == nil {
			t.Fatalf("%s: %s", filename, err)
		}

		for r.err == nil && !r.eof {
			r.readByte()
		}
		info.header = r.buf
	}
	if r.err != nil {
		return r.err
	}

	if info.fset == nil {
		return nil
	}

	// Parse file header & record imports.
	info.parsed, info.parseErr = parser.ParseFile(info.fset, info.name, info.header, parser.ImportsOnly|parser.ParseComments)
	if info.parseErr != nil {
		return nil
	}

	hasEmbed := false

// behavior if ignored.
type Error struct {
	Fset *token.FileSet // file set for interpretation of Pos
	Pos  token.Pos      // error position
	Msg  string         // error message
	Soft bool           // if set, error is "soft"

	// go116code is a future API, unexported as the set of error codes is large
	// and likely to change significantly during experimentation. Tools wishing

	"go/token"
	"go/types"
	"os"
	"strconv"

	"golang.org/x/tools/go/analysis"
	"golang.org/x/tools/internal/aliases"
)

func TypeErrorEndPos(fset *token.FileSet, src []byte, start token.Pos) token.Pos {
	// Get the end position for the type error.
	offset, end := fset.PositionFor(start, false).Offset, start
	if offset >= len(src) {
		return end
	}
	if width := bytes.IndexAny(src[offset:], " \n,():;[]+-*"); width > 0 {

		// name (name with subscript).
		tparamIndex: make(map[ident]*types.TypeParam),

		fake: fakeFileSet{
			fset:  fset,
			files: make(map[string]*fileInfo),
		},
	}
	defer p.fake.setLines() // set lines for files in fset

	for i, pt := range predeclared {
		p.typCache[uint64(i)] = pt
	}
	// Special handling for "any", whose representation may be changed by the