// We use -64 because it is rare; see issue 20080 and CL 41619.
// -64 is the smallest int that fits in a single byte as a varint.
const deltaNewFile = -64

// Synthesize a token.Pos
type fakeFileSet struct {
	fset  *token.FileSet
	files map[string]*fileInfo
}

type fileInfo struct {
	file     *token.File
	lastline int
}

const maxlines = 64 * 1024

func (s *fakeFileSet) pos(file string, line, column int) token.Pos {

	isTerminal    = term.IsTerminal(int(os.Stdout.Fd()))
	logPrefix     = ""
	aliases       = map[*regexp.Regexp]string{}
)

type analyzer struct {
	fset      *token.FileSet // positions are relative to fset
	ctx       build.Context
	failed    bool
	donePaths map[string]interface{}
}

func newAnalyzer() *analyzer {
	ctx := build.Default
	ctx.CgoEnabled = true

	a := &analyzer{

// the corresponding package object to the packages map, and returns the object.
// The packages map must contain all packages already imported.
func Import(fset *token.FileSet, packages map[string]*types.Package, path, srcDir string, lookup func(path string) (io.ReadCloser, error)) (pkg *types.Package, err error) {
	var rc io.ReadCloser
	var id string
	if lookup != nil {

	"fmt"
	"go/ast"
	"go/importer"
	"go/parser"
	"go/token"
	"go/types"
	"internal/godebug"
	"internal/testenv"
	"strings"
	"testing"

	. "go/types"
)

func testEval(t *testing.T, fset *token.FileSet, pkg *Package, pos token.Pos, expr string, typ Type, typStr, valStr string) {
	gotTv, err := Eval(fset, pkg, pos, expr)
	if err != nil {
		t.Errorf("Eval(%q) failed: %s", expr, err)
		return
	}
	if gotTv.Type == nil {

//
// The Run function should not call any of the Pass functions concurrently.
type Pass struct {
	Analyzer *Analyzer // the identity of the current analyzer

	// syntax and type information
	Fset         *token.FileSet // file position information; Run may add new files
	Files        []*ast.File    // the abstract syntax tree of each file
	OtherFiles   []string       // names of non-Go files of this package