gcimporter_test.go

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package importer
     6  
     7  import (
     8  	"bytes"
     9  	"cmd/compile/internal/types2"
    10  	"fmt"
    11  	"internal/goexperiment"
    12  	"internal/testenv"
    13  	"os"
    14  	"os/exec"
    15  	"path/filepath"
    16  	"runtime"
    17  	"strings"
    18  	"testing"
    19  	"time"
    20  )
    21  
    22  // skipSpecialPlatforms causes the test to be skipped for platforms where
    23  // builders (build.golang.org) don't have access to compiled packages for
    24  // import.
    25  func skipSpecialPlatforms(t *testing.T) {
    26  	switch platform := runtime.GOOS + "-" + runtime.GOARCH; platform {
    27  	case "darwin-arm64":
    28  		t.Skipf("no compiled packages available for import on %s", platform)
    29  	}
    30  }
    31  
    32  // compile runs the compiler on filename, with dirname as the working directory,
    33  // and writes the output file to outdirname.
    34  func compile(t *testing.T, dirname, filename, outdirname string) string {
    35  	// filename must end with ".go"
    36  	if !strings.HasSuffix(filename, ".go") {
    37  		t.Fatalf("filename doesn't end in .go: %s", filename)
    38  	}
    39  	basename := filepath.Base(filename)
    40  	outname := filepath.Join(outdirname, basename[:len(basename)-2]+"o")
    41  	cmd := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-o", outname, filename)
    42  	cmd.Dir = dirname
    43  	out, err := cmd.CombinedOutput()
    44  	if err != nil {
    45  		t.Logf("%s", out)
    46  		t.Fatalf("go tool compile %s failed: %s", filename, err)
    47  	}
    48  	return outname
    49  }
    50  
    51  func testPath(t *testing.T, path, srcDir string) *types2.Package {
    52  	t0 := time.Now()
    53  	pkg, err := Import(make(map[string]*types2.Package), path, srcDir, nil)
    54  	if err != nil {
    55  		t.Errorf("testPath(%s): %s", path, err)
    56  		return nil
    57  	}
    58  	t.Logf("testPath(%s): %v", path, time.Since(t0))
    59  	return pkg
    60  }
    61  
    62  const maxTime = 30 * time.Second
    63  
    64  func testDir(t *testing.T, dir string, endTime time.Time) (nimports int) {
    65  	dirname := filepath.Join(runtime.GOROOT(), "pkg", runtime.GOOS+"_"+runtime.GOARCH, dir)
    66  	list, err := os.ReadDir(dirname)
    67  	if err != nil {
    68  		t.Fatalf("testDir(%s): %s", dirname, err)
    69  	}
    70  	for _, f := range list {
    71  		if time.Now().After(endTime) {
    72  			t.Log("testing time used up")
    73  			return
    74  		}
    75  		switch {
    76  		case !f.IsDir():
    77  			// try extensions
    78  			for _, ext := range pkgExts {
    79  				if strings.HasSuffix(f.Name(), ext) {
    80  					name := f.Name()[0 : len(f.Name())-len(ext)] // remove extension
    81  					if testPath(t, filepath.Join(dir, name), dir) != nil {
    82  						nimports++
    83  					}
    84  				}
    85  			}
    86  		case f.IsDir():
    87  			nimports += testDir(t, filepath.Join(dir, f.Name()), endTime)
    88  		}
    89  	}
    90  	return
    91  }
    92  
    93  func mktmpdir(t *testing.T) string {
    94  	tmpdir, err := os.MkdirTemp("", "gcimporter_test")
    95  	if err != nil {
    96  		t.Fatal("mktmpdir:", err)
    97  	}
    98  	if err := os.Mkdir(filepath.Join(tmpdir, "testdata"), 0700); err != nil {
    99  		os.RemoveAll(tmpdir)
   100  		t.Fatal("mktmpdir:", err)
   101  	}
   102  	return tmpdir
   103  }
   104  
   105  func TestImportTestdata(t *testing.T) {
   106  	// This package only handles gc export data.
   107  	if runtime.Compiler != "gc" {
   108  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   109  	}
   110  
   111  	testfiles := map[string][]string{
   112  		"exports.go": {"go/ast", "go/token"},
   113  	}
   114  	if !goexperiment.Unified {
   115  		testfiles["generics.go"] = nil
   116  	}
   117  
   118  	for testfile, wantImports := range testfiles {
   119  		tmpdir := mktmpdir(t)
   120  		defer os.RemoveAll(tmpdir)
   121  
   122  		compile(t, "testdata", testfile, filepath.Join(tmpdir, "testdata"))
   123  		path := "./testdata/" + strings.TrimSuffix(testfile, ".go")
   124  
   125  		if pkg := testPath(t, path, tmpdir); pkg != nil {
   126  			// The package's Imports list must include all packages
   127  			// explicitly imported by testfile, plus all packages
   128  			// referenced indirectly via exported objects in testfile.
   129  			got := fmt.Sprint(pkg.Imports())
   130  			for _, want := range wantImports {
   131  				if !strings.Contains(got, want) {
   132  					t.Errorf(`Package("exports").Imports() = %s, does not contain %s`, got, want)
   133  				}
   134  			}
   135  		}
   136  	}
   137  }
   138  
   139  func TestVersionHandling(t *testing.T) {
   140  	skipSpecialPlatforms(t)
   141  
   142  	// This package only handles gc export data.
   143  	if runtime.Compiler != "gc" {
   144  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   145  	}
   146  
   147  	const dir = "./testdata/versions"
   148  	list, err := os.ReadDir(dir)
   149  	if err != nil {
   150  		t.Fatal(err)
   151  	}
   152  
   153  	tmpdir := mktmpdir(t)
   154  	defer os.RemoveAll(tmpdir)
   155  	corruptdir := filepath.Join(tmpdir, "testdata", "versions")
   156  	if err := os.Mkdir(corruptdir, 0700); err != nil {
   157  		t.Fatal(err)
   158  	}
   159  
   160  	for _, f := range list {
   161  		name := f.Name()
   162  		if !strings.HasSuffix(name, ".a") {
   163  			continue // not a package file
   164  		}
   165  		if strings.Contains(name, "corrupted") {
   166  			continue // don't process a leftover corrupted file
   167  		}
   168  		pkgpath := "./" + name[:len(name)-2]
   169  
   170  		if testing.Verbose() {
   171  			t.Logf("importing %s", name)
   172  		}
   173  
   174  		// test that export data can be imported
   175  		_, err := Import(make(map[string]*types2.Package), pkgpath, dir, nil)
   176  		if err != nil {
   177  			// ok to fail if it fails with a no longer supported error for select files
   178  			if strings.Contains(err.Error(), "no longer supported") {
   179  				switch name {
   180  				case "test_go1.7_0.a", "test_go1.7_1.a",
   181  					"test_go1.8_4.a", "test_go1.8_5.a",
   182  					"test_go1.11_6b.a", "test_go1.11_999b.a":
   183  					continue
   184  				}
   185  				// fall through
   186  			}
   187  			// ok to fail if it fails with a newer version error for select files
   188  			if strings.Contains(err.Error(), "newer version") {
   189  				switch name {
   190  				case "test_go1.11_999i.a":
   191  					continue
   192  				}
   193  				// fall through
   194  			}
   195  			t.Errorf("import %q failed: %v", pkgpath, err)
   196  			continue
   197  		}
   198  
   199  		// create file with corrupted export data
   200  		// 1) read file
   201  		data, err := os.ReadFile(filepath.Join(dir, name))
   202  		if err != nil {
   203  			t.Fatal(err)
   204  		}
   205  		// 2) find export data
   206  		i := bytes.Index(data, []byte("\n$$B\n")) + 5
   207  		j := bytes.Index(data[i:], []byte("\n$$\n")) + i
   208  		if i < 0 || j < 0 || i > j {
   209  			t.Fatalf("export data section not found (i = %d, j = %d)", i, j)
   210  		}
   211  		// 3) corrupt the data (increment every 7th byte)
   212  		for k := j - 13; k >= i; k -= 7 {
   213  			data[k]++
   214  		}
   215  		// 4) write the file
   216  		pkgpath += "_corrupted"
   217  		filename := filepath.Join(corruptdir, pkgpath) + ".a"
   218  		os.WriteFile(filename, data, 0666)
   219  
   220  		// test that importing the corrupted file results in an error
   221  		_, err = Import(make(map[string]*types2.Package), pkgpath, corruptdir, nil)
   222  		if err == nil {
   223  			t.Errorf("import corrupted %q succeeded", pkgpath)
   224  		} else if msg := err.Error(); !strings.Contains(msg, "version skew") {
   225  			t.Errorf("import %q error incorrect (%s)", pkgpath, msg)
   226  		}
   227  	}
   228  }
   229  
   230  func TestImportStdLib(t *testing.T) {
   231  	skipSpecialPlatforms(t)
   232  
   233  	// This package only handles gc export data.
   234  	if runtime.Compiler != "gc" {
   235  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   236  	}
   237  
   238  	dt := maxTime
   239  	if testing.Short() && testenv.Builder() == "" {
   240  		dt = 10 * time.Millisecond
   241  	}
   242  	nimports := testDir(t, "", time.Now().Add(dt)) // installed packages
   243  	t.Logf("tested %d imports", nimports)
   244  }
   245  
   246  var importedObjectTests = []struct {
   247  	name string
   248  	want string
   249  }{
   250  	// non-interfaces
   251  	{"crypto.Hash", "type Hash uint"},
   252  	{"go/ast.ObjKind", "type ObjKind int"},
   253  	{"go/types.Qualifier", "type Qualifier func(*Package) string"},
   254  	{"go/types.Comparable", "func Comparable(T Type) bool"},
   255  	{"math.Pi", "const Pi untyped float"},
   256  	{"math.Sin", "func Sin(x float64) float64"},
   257  	{"go/ast.NotNilFilter", "func NotNilFilter(_ string, v reflect.Value) bool"},
   258  	{"go/internal/gcimporter.FindPkg", "func FindPkg(path string, srcDir string) (filename string, id string)"},
   259  
   260  	// interfaces
   261  	{"context.Context", "type Context interface{Deadline() (deadline time.Time, ok bool); Done() <-chan struct{}; Err() error; Value(key any) any}"},
   262  	{"crypto.Decrypter", "type Decrypter interface{Decrypt(rand io.Reader, msg []byte, opts DecrypterOpts) (plaintext []byte, err error); Public() PublicKey}"},
   263  	{"encoding.BinaryMarshaler", "type BinaryMarshaler interface{MarshalBinary() (data []byte, err error)}"},
   264  	{"io.Reader", "type Reader interface{Read(p []byte) (n int, err error)}"},
   265  	{"io.ReadWriter", "type ReadWriter interface{Reader; Writer}"},
   266  	{"go/ast.Node", "type Node interface{End() go/token.Pos; Pos() go/token.Pos}"},
   267  	{"go/types.Type", "type Type interface{String() string; Underlying() Type}"},
   268  }
   269  
   270  func TestImportedTypes(t *testing.T) {
   271  	skipSpecialPlatforms(t)
   272  
   273  	// This package only handles gc export data.
   274  	if runtime.Compiler != "gc" {
   275  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   276  	}
   277  
   278  	for _, test := range importedObjectTests {
   279  		s := strings.Split(test.name, ".")
   280  		if len(s) != 2 {
   281  			t.Fatal("inconsistent test data")
   282  		}
   283  		importPath := s[0]
   284  		objName := s[1]
   285  
   286  		pkg, err := Import(make(map[string]*types2.Package), importPath, ".", nil)
   287  		if err != nil {
   288  			t.Error(err)
   289  			continue
   290  		}
   291  
   292  		obj := pkg.Scope().Lookup(objName)
   293  		if obj == nil {
   294  			t.Errorf("%s: object not found", test.name)
   295  			continue
   296  		}
   297  
   298  		got := types2.ObjectString(obj, types2.RelativeTo(pkg))
   299  		if got != test.want {
   300  			t.Errorf("%s: got %q; want %q", test.name, got, test.want)
   301  		}
   302  
   303  		if named, _ := obj.Type().(*types2.Named); named != nil {
   304  			verifyInterfaceMethodRecvs(t, named, 0)
   305  		}
   306  	}
   307  }
   308  
   309  // verifyInterfaceMethodRecvs verifies that method receiver types
   310  // are named if the methods belong to a named interface type.
   311  func verifyInterfaceMethodRecvs(t *testing.T, named *types2.Named, level int) {
   312  	// avoid endless recursion in case of an embedding bug that lead to a cycle
   313  	if level > 10 {
   314  		t.Errorf("%s: embeds itself", named)
   315  		return
   316  	}
   317  
   318  	iface, _ := named.Underlying().(*types2.Interface)
   319  	if iface == nil {
   320  		return // not an interface
   321  	}
   322  
   323  	// check explicitly declared methods
   324  	for i := 0; i < iface.NumExplicitMethods(); i++ {
   325  		m := iface.ExplicitMethod(i)
   326  		recv := m.Type().(*types2.Signature).Recv()
   327  		if recv == nil {
   328  			t.Errorf("%s: missing receiver type", m)
   329  			continue
   330  		}
   331  		if recv.Type() != named {
   332  			t.Errorf("%s: got recv type %s; want %s", m, recv.Type(), named)
   333  		}
   334  	}
   335  
   336  	// check embedded interfaces (if they are named, too)
   337  	for i := 0; i < iface.NumEmbeddeds(); i++ {
   338  		// embedding of interfaces cannot have cycles; recursion will terminate
   339  		if etype, _ := iface.EmbeddedType(i).(*types2.Named); etype != nil {
   340  			verifyInterfaceMethodRecvs(t, etype, level+1)
   341  		}
   342  	}
   343  }
   344  
   345  func TestIssue5815(t *testing.T) {
   346  	skipSpecialPlatforms(t)
   347  
   348  	// This package only handles gc export data.
   349  	if runtime.Compiler != "gc" {
   350  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   351  	}
   352  
   353  	pkg := importPkg(t, "strings", ".")
   354  
   355  	scope := pkg.Scope()
   356  	for _, name := range scope.Names() {
   357  		obj := scope.Lookup(name)
   358  		if obj.Pkg() == nil {
   359  			t.Errorf("no pkg for %s", obj)
   360  		}
   361  		if tname, _ := obj.(*types2.TypeName); tname != nil {
   362  			named := tname.Type().(*types2.Named)
   363  			for i := 0; i < named.NumMethods(); i++ {
   364  				m := named.Method(i)
   365  				if m.Pkg() == nil {
   366  					t.Errorf("no pkg for %s", m)
   367  				}
   368  			}
   369  		}
   370  	}
   371  }
   372  
   373  // Smoke test to ensure that imported methods get the correct package.
   374  func TestCorrectMethodPackage(t *testing.T) {
   375  	skipSpecialPlatforms(t)
   376  
   377  	// This package only handles gc export data.
   378  	if runtime.Compiler != "gc" {
   379  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   380  	}
   381  
   382  	imports := make(map[string]*types2.Package)
   383  	_, err := Import(imports, "net/http", ".", nil)
   384  	if err != nil {
   385  		t.Fatal(err)
   386  	}
   387  
   388  	mutex := imports["sync"].Scope().Lookup("Mutex").(*types2.TypeName).Type()
   389  	obj, _, _ := types2.LookupFieldOrMethod(types2.NewPointer(mutex), false, nil, "Lock")
   390  	lock := obj.(*types2.Func)
   391  	if got, want := lock.Pkg().Path(), "sync"; got != want {
   392  		t.Errorf("got package path %q; want %q", got, want)
   393  	}
   394  }
   395  
   396  func TestIssue13566(t *testing.T) {
   397  	skipSpecialPlatforms(t)
   398  
   399  	// This package only handles gc export data.
   400  	if runtime.Compiler != "gc" {
   401  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   402  	}
   403  
   404  	// On windows, we have to set the -D option for the compiler to avoid having a drive
   405  	// letter and an illegal ':' in the import path - just skip it (see also issue #3483).
   406  	if runtime.GOOS == "windows" {
   407  		t.Skip("avoid dealing with relative paths/drive letters on windows")
   408  	}
   409  
   410  	tmpdir := mktmpdir(t)
   411  	defer os.RemoveAll(tmpdir)
   412  	testoutdir := filepath.Join(tmpdir, "testdata")
   413  
   414  	// b.go needs to be compiled from the output directory so that the compiler can
   415  	// find the compiled package a. We pass the full path to compile() so that we
   416  	// don't have to copy the file to that directory.
   417  	bpath, err := filepath.Abs(filepath.Join("testdata", "b.go"))
   418  	if err != nil {
   419  		t.Fatal(err)
   420  	}
   421  	compile(t, "testdata", "a.go", testoutdir)
   422  	compile(t, testoutdir, bpath, testoutdir)
   423  
   424  	// import must succeed (test for issue at hand)
   425  	pkg := importPkg(t, "./testdata/b", tmpdir)
   426  
   427  	// make sure all indirectly imported packages have names
   428  	for _, imp := range pkg.Imports() {
   429  		if imp.Name() == "" {
   430  			t.Errorf("no name for %s package", imp.Path())
   431  		}
   432  	}
   433  }
   434  
   435  func TestIssue13898(t *testing.T) {
   436  	skipSpecialPlatforms(t)
   437  
   438  	// This package only handles gc export data.
   439  	if runtime.Compiler != "gc" {
   440  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   441  	}
   442  
   443  	// import go/internal/gcimporter which imports go/types partially
   444  	imports := make(map[string]*types2.Package)
   445  	_, err := Import(imports, "go/internal/gcimporter", ".", nil)
   446  	if err != nil {
   447  		t.Fatal(err)
   448  	}
   449  
   450  	// look for go/types package
   451  	var goTypesPkg *types2.Package
   452  	for path, pkg := range imports {
   453  		if path == "go/types" {
   454  			goTypesPkg = pkg
   455  			break
   456  		}
   457  	}
   458  	if goTypesPkg == nil {
   459  		t.Fatal("go/types not found")
   460  	}
   461  
   462  	// look for go/types.Object type
   463  	obj := lookupObj(t, goTypesPkg.Scope(), "Object")
   464  	typ, ok := obj.Type().(*types2.Named)
   465  	if !ok {
   466  		t.Fatalf("go/types.Object type is %v; wanted named type", typ)
   467  	}
   468  
   469  	// lookup go/types.Object.Pkg method
   470  	m, index, indirect := types2.LookupFieldOrMethod(typ, false, nil, "Pkg")
   471  	if m == nil {
   472  		t.Fatalf("go/types.Object.Pkg not found (index = %v, indirect = %v)", index, indirect)
   473  	}
   474  
   475  	// the method must belong to go/types
   476  	if m.Pkg().Path() != "go/types" {
   477  		t.Fatalf("found %v; want go/types", m.Pkg())
   478  	}
   479  }
   480  
   481  func TestIssue15517(t *testing.T) {
   482  	skipSpecialPlatforms(t)
   483  
   484  	// This package only handles gc export data.
   485  	if runtime.Compiler != "gc" {
   486  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   487  	}
   488  
   489  	// On windows, we have to set the -D option for the compiler to avoid having a drive
   490  	// letter and an illegal ':' in the import path - just skip it (see also issue #3483).
   491  	if runtime.GOOS == "windows" {
   492  		t.Skip("avoid dealing with relative paths/drive letters on windows")
   493  	}
   494  
   495  	tmpdir := mktmpdir(t)
   496  	defer os.RemoveAll(tmpdir)
   497  
   498  	compile(t, "testdata", "p.go", filepath.Join(tmpdir, "testdata"))
   499  
   500  	// Multiple imports of p must succeed without redeclaration errors.
   501  	// We use an import path that's not cleaned up so that the eventual
   502  	// file path for the package is different from the package path; this
   503  	// will expose the error if it is present.
   504  	//
   505  	// (Issue: Both the textual and the binary importer used the file path
   506  	// of the package to be imported as key into the shared packages map.
   507  	// However, the binary importer then used the package path to identify
   508  	// the imported package to mark it as complete; effectively marking the
   509  	// wrong package as complete. By using an "unclean" package path, the
   510  	// file and package path are different, exposing the problem if present.
   511  	// The same issue occurs with vendoring.)
   512  	imports := make(map[string]*types2.Package)
   513  	for i := 0; i < 3; i++ {
   514  		if _, err := Import(imports, "./././testdata/p", tmpdir, nil); err != nil {
   515  			t.Fatal(err)
   516  		}
   517  	}
   518  }
   519  
   520  func TestIssue15920(t *testing.T) {
   521  	skipSpecialPlatforms(t)
   522  
   523  	// This package only handles gc export data.
   524  	if runtime.Compiler != "gc" {
   525  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   526  	}
   527  
   528  	// On windows, we have to set the -D option for the compiler to avoid having a drive
   529  	// letter and an illegal ':' in the import path - just skip it (see also issue #3483).
   530  	if runtime.GOOS == "windows" {
   531  		t.Skip("avoid dealing with relative paths/drive letters on windows")
   532  	}
   533  
   534  	compileAndImportPkg(t, "issue15920")
   535  }
   536  
   537  func TestIssue20046(t *testing.T) {
   538  	skipSpecialPlatforms(t)
   539  
   540  	// This package only handles gc export data.
   541  	if runtime.Compiler != "gc" {
   542  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   543  	}
   544  
   545  	// On windows, we have to set the -D option for the compiler to avoid having a drive
   546  	// letter and an illegal ':' in the import path - just skip it (see also issue #3483).
   547  	if runtime.GOOS == "windows" {
   548  		t.Skip("avoid dealing with relative paths/drive letters on windows")
   549  	}
   550  
   551  	// "./issue20046".V.M must exist
   552  	pkg := compileAndImportPkg(t, "issue20046")
   553  	obj := lookupObj(t, pkg.Scope(), "V")
   554  	if m, index, indirect := types2.LookupFieldOrMethod(obj.Type(), false, nil, "M"); m == nil {
   555  		t.Fatalf("V.M not found (index = %v, indirect = %v)", index, indirect)
   556  	}
   557  }
   558  func TestIssue25301(t *testing.T) {
   559  	skipSpecialPlatforms(t)
   560  
   561  	// This package only handles gc export data.
   562  	if runtime.Compiler != "gc" {
   563  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   564  	}
   565  
   566  	// On windows, we have to set the -D option for the compiler to avoid having a drive
   567  	// letter and an illegal ':' in the import path - just skip it (see also issue #3483).
   568  	if runtime.GOOS == "windows" {
   569  		t.Skip("avoid dealing with relative paths/drive letters on windows")
   570  	}
   571  
   572  	compileAndImportPkg(t, "issue25301")
   573  }
   574  
   575  func TestIssue25596(t *testing.T) {
   576  	skipSpecialPlatforms(t)
   577  
   578  	// This package only handles gc export data.
   579  	if runtime.Compiler != "gc" {
   580  		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
   581  	}
   582  
   583  	// On windows, we have to set the -D option for the compiler to avoid having a drive
   584  	// letter and an illegal ':' in the import path - just skip it (see also issue #3483).
   585  	if runtime.GOOS == "windows" {
   586  		t.Skip("avoid dealing with relative paths/drive letters on windows")
   587  	}
   588  
   589  	compileAndImportPkg(t, "issue25596")
   590  }
   591  
   592  func importPkg(t *testing.T, path, srcDir string) *types2.Package {
   593  	pkg, err := Import(make(map[string]*types2.Package), path, srcDir, nil)
   594  	if err != nil {
   595  		t.Fatal(err)
   596  	}
   597  	return pkg
   598  }
   599  
   600  func compileAndImportPkg(t *testing.T, name string) *types2.Package {
   601  	tmpdir := mktmpdir(t)
   602  	defer os.RemoveAll(tmpdir)
   603  	compile(t, "testdata", name+".go", filepath.Join(tmpdir, "testdata"))
   604  	return importPkg(t, "./testdata/"+name, tmpdir)
   605  }
   606  
   607  func lookupObj(t *testing.T, scope *types2.Scope, name string) types2.Object {
   608  	if obj := scope.Lookup(name); obj != nil {
   609  		return obj
   610  	}
   611  	t.Fatalf("%s not found", name)
   612  	return nil
   613  }
   614
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