Bump viper version, fix nobrowser (#1991)

vendor/golang.org/x/tools/go/ast/astutil/rewrite.go

@@ -9,6 +9,8 @@ import (
 	"go/ast"
 	"reflect"
 	"sort"
+
+	"golang.org/x/tools/internal/typeparams"
 )
 
 // An ApplyFunc is invoked by Apply for each node n, even if n is nil,
@@ -437,7 +439,11 @@ func (a *application) apply(parent ast.Node, name string, iter *iterator, n ast.
 		}
 
 	default:
-		panic(fmt.Sprintf("Apply: unexpected node type %T", n))
+		if typeparams.IsListExpr(n) {
+			a.applyList(n, "ElemList")
+		} else {
+			panic(fmt.Sprintf("Apply: unexpected node type %T", n))
+		}
 	}
 
 	if a.post != nil && !a.post(&a.cursor) {

vendor/golang.org/x/tools/go/gcexportdata/gcexportdata.go

@@ -100,10 +100,34 @@ func Read(in io.Reader, fset *token.FileSet, imports map[string]*types.Package,
 // Write writes encoded type information for the specified package to out.
 // The FileSet provides file position information for named objects.
 func Write(out io.Writer, fset *token.FileSet, pkg *types.Package) error {
-	b, err := gcimporter.IExportData(fset, pkg)
-	if err != nil {
+	if _, err := io.WriteString(out, "i"); err != nil {
 		return err
 	}
-	_, err = out.Write(b)
-	return err
+	return gcimporter.IExportData(out, fset, pkg)
+}
+
+// ReadBundle reads an export bundle from in, decodes it, and returns type
+// information for the packages.
+// File position information is added to fset.
+//
+// ReadBundle may inspect and add to the imports map to ensure that references
+// within the export bundle to other packages are consistent.
+//
+// On return, the state of the reader is undefined.
+//
+// Experimental: This API is experimental and may change in the future.
+func ReadBundle(in io.Reader, fset *token.FileSet, imports map[string]*types.Package) ([]*types.Package, error) {
+	data, err := ioutil.ReadAll(in)
+	if err != nil {
+		return nil, fmt.Errorf("reading export bundle: %v", err)
+	}
+	return gcimporter.IImportBundle(fset, imports, data)
+}
+
+// WriteBundle writes encoded type information for the specified packages to out.
+// The FileSet provides file position information for named objects.
+//
+// Experimental: This API is experimental and may change in the future.
+func WriteBundle(out io.Writer, fset *token.FileSet, pkgs []*types.Package) error {
+	return gcimporter.IExportBundle(out, fset, pkgs)
 }

vendor/golang.org/x/tools/go/internal/gcimporter/iexport.go

@@ -25,12 +25,25 @@ import (
 // 0: Go1.11 encoding
 const iexportVersion = 0
 
-// IExportData returns the binary export data for pkg.
+// Current bundled export format version. Increase with each format change.
+// 0: initial implementation
+const bundleVersion = 0
+
+// IExportData writes indexed export data for pkg to out.
 //
 // If no file set is provided, position info will be missing.
 // The package path of the top-level package will not be recorded,
 // so that calls to IImportData can override with a provided package path.
-func IExportData(fset *token.FileSet, pkg *types.Package) (b []byte, err error) {
+func IExportData(out io.Writer, fset *token.FileSet, pkg *types.Package) error {
+	return iexportCommon(out, fset, false, []*types.Package{pkg})
+}
+
+// IExportBundle writes an indexed export bundle for pkgs to out.
+func IExportBundle(out io.Writer, fset *token.FileSet, pkgs []*types.Package) error {
+	return iexportCommon(out, fset, true, pkgs)
+}
+
+func iexportCommon(out io.Writer, fset *token.FileSet, bundle bool, pkgs []*types.Package) (err error) {
 	defer func() {
 		if e := recover(); e != nil {
 			if ierr, ok := e.(internalError); ok {
@@ -43,13 +56,14 @@ func IExportData(fset *token.FileSet, pkg *types.Package) (b []byte, err error)
 	}()
 
 	p := iexporter{
-		out:         bytes.NewBuffer(nil),
 		fset:        fset,
 		allPkgs:     map[*types.Package]bool{},
 		stringIndex: map[string]uint64{},
 		declIndex:   map[types.Object]uint64{},
 		typIndex:    map[types.Type]uint64{},
-		localpkg:    pkg,
+	}
+	if !bundle {
+		p.localpkg = pkgs[0]
 	}
 
 	for i, pt := range predeclared() {
@@ -60,10 +74,20 @@ func IExportData(fset *token.FileSet, pkg *types.Package) (b []byte, err error)
 	}
 
 	// Initialize work queue with exported declarations.
-	scope := pkg.Scope()
-	for _, name := range scope.Names() {
-		if ast.IsExported(name) {
-			p.pushDecl(scope.Lookup(name))
+	for _, pkg := range pkgs {
+		scope := pkg.Scope()
+		for _, name := range scope.Names() {
+			if ast.IsExported(name) {
+				p.pushDecl(scope.Lookup(name))
+			}
+		}
+
+		if bundle {
+			// Ensure pkg and its imports are included in the index.
+			p.allPkgs[pkg] = true
+			for _, imp := range pkg.Imports() {
+				p.allPkgs[imp] = true
+			}
 		}
 	}
 
@@ -76,21 +100,35 @@ func IExportData(fset *token.FileSet, pkg *types.Package) (b []byte, err error)
 	dataLen := uint64(p.data0.Len())
 	w := p.newWriter()
 	w.writeIndex(p.declIndex)
+
+	if bundle {
+		w.uint64(uint64(len(pkgs)))
+		for _, pkg := range pkgs {
+			w.pkg(pkg)
+			imps := pkg.Imports()
+			w.uint64(uint64(len(imps)))
+			for _, imp := range imps {
+				w.pkg(imp)
+			}
+		}
+	}
 	w.flush()
 
 	// Assemble header.
 	var hdr intWriter
-	hdr.WriteByte('i')
+	if bundle {
+		hdr.uint64(bundleVersion)
+	}
 	hdr.uint64(iexportVersion)
 	hdr.uint64(uint64(p.strings.Len()))
 	hdr.uint64(dataLen)
 
 	// Flush output.
-	io.Copy(p.out, &hdr)
-	io.Copy(p.out, &p.strings)
-	io.Copy(p.out, &p.data0)
+	io.Copy(out, &hdr)
+	io.Copy(out, &p.strings)
+	io.Copy(out, &p.data0)
 
-	return p.out.Bytes(), nil
+	return nil
 }
 
 // writeIndex writes out an object index. mainIndex indicates whether
@@ -104,7 +142,9 @@ func (w *exportWriter) writeIndex(index map[types.Object]uint64) {
 	// For the main index, make sure to include every package that
 	// we reference, even if we're not exporting (or reexporting)
 	// any symbols from it.
-	pkgObjs[w.p.localpkg] = nil
+	if w.p.localpkg != nil {
+		pkgObjs[w.p.localpkg] = nil
+	}
 	for pkg := range w.p.allPkgs {
 		pkgObjs[pkg] = nil
 	}
@@ -474,10 +514,10 @@ func (w *exportWriter) param(obj types.Object) {
 func (w *exportWriter) value(typ types.Type, v constant.Value) {
 	w.typ(typ, nil)
 
-	switch v.Kind() {
-	case constant.Bool:
+	switch b := typ.Underlying().(*types.Basic); b.Info() & types.IsConstType {
+	case types.IsBoolean:
 		w.bool(constant.BoolVal(v))
-	case constant.Int:
+	case types.IsInteger:
 		var i big.Int
 		if i64, exact := constant.Int64Val(v); exact {
 			i.SetInt64(i64)
@@ -487,25 +527,27 @@ func (w *exportWriter) value(typ types.Type, v constant.Value) {
 			i.SetString(v.ExactString(), 10)
 		}
 		w.mpint(&i, typ)
-	case constant.Float:
+	case types.IsFloat:
 		f := constantToFloat(v)
 		w.mpfloat(f, typ)
-	case constant.Complex:
+	case types.IsComplex:
 		w.mpfloat(constantToFloat(constant.Real(v)), typ)
 		w.mpfloat(constantToFloat(constant.Imag(v)), typ)
-	case constant.String:
+	case types.IsString:
 		w.string(constant.StringVal(v))
-	case constant.Unknown:
-		// package contains type errors
 	default:
-		panic(internalErrorf("unexpected value %v (%T)", v, v))
+		if b.Kind() == types.Invalid {
+			// package contains type errors
+			break
+		}
+		panic(internalErrorf("unexpected type %v (%v)", typ, typ.Underlying()))
 	}
 }
 
 // constantToFloat converts a constant.Value with kind constant.Float to a
 // big.Float.
 func constantToFloat(x constant.Value) *big.Float {
-	assert(x.Kind() == constant.Float)
+	x = constant.ToFloat(x)
 	// Use the same floating-point precision (512) as cmd/compile
 	// (see Mpprec in cmd/compile/internal/gc/mpfloat.go).
 	const mpprec = 512

vendor/golang.org/x/tools/go/internal/gcimporter/iimport.go

@@ -59,10 +59,23 @@ const (
 )
 
 // IImportData imports a package from the serialized package data
-// and returns the number of bytes consumed and a reference to the package.
+// and returns 0 and a reference to the package.
 // If the export data version is not recognized or the format is otherwise
 // compromised, an error is returned.
-func IImportData(fset *token.FileSet, imports map[string]*types.Package, data []byte, path string) (_ int, pkg *types.Package, err error) {
+func IImportData(fset *token.FileSet, imports map[string]*types.Package, data []byte, path string) (int, *types.Package, error) {
+	pkgs, err := iimportCommon(fset, imports, data, false, path)
+	if err != nil {
+		return 0, nil, err
+	}
+	return 0, pkgs[0], nil
+}
+
+// IImportBundle imports a set of packages from the serialized package bundle.
+func IImportBundle(fset *token.FileSet, imports map[string]*types.Package, data []byte) ([]*types.Package, error) {
+	return iimportCommon(fset, imports, data, true, "")
+}
+
+func iimportCommon(fset *token.FileSet, imports map[string]*types.Package, data []byte, bundle bool, path string) (pkgs []*types.Package, err error) {
 	const currentVersion = 1
 	version := int64(-1)
 	defer func() {
@@ -77,6 +90,15 @@ func IImportData(fset *token.FileSet, imports map[string]*types.Package, data []
 
 	r := &intReader{bytes.NewReader(data), path}
 
+	if bundle {
+		bundleVersion := r.uint64()
+		switch bundleVersion {
+		case bundleVersion:
+		default:
+			errorf("unknown bundle format version %d", bundleVersion)
+		}
+	}
+
 	version = int64(r.uint64())
 	switch version {
 	case currentVersion, 0:
@@ -143,39 +165,58 @@ func IImportData(fset *token.FileSet, imports map[string]*types.Package, data []
 		p.pkgIndex[pkg] = nameIndex
 		pkgList[i] = pkg
 	}
-	if len(pkgList) == 0 {
-		errorf("no packages found for %s", path)
-		panic("unreachable")
+
+	if bundle {
+		pkgs = make([]*types.Package, r.uint64())
+		for i := range pkgs {
+			pkg := p.pkgAt(r.uint64())
+			imps := make([]*types.Package, r.uint64())
+			for j := range imps {
+				imps[j] = p.pkgAt(r.uint64())
+			}
+			pkg.SetImports(imps)
+			pkgs[i] = pkg
+		}
+	} else {
+		if len(pkgList) == 0 {
+			errorf("no packages found for %s", path)
+			panic("unreachable")
+		}
+		pkgs = pkgList[:1]
+
+		// record all referenced packages as imports
+		list := append(([]*types.Package)(nil), pkgList[1:]...)
+		sort.Sort(byPath(list))
+		pkgs[0].SetImports(list)
 	}
-	p.ipkg = pkgList[0]
-	names := make([]string, 0, len(p.pkgIndex[p.ipkg]))
-	for name := range p.pkgIndex[p.ipkg] {
-		names = append(names, name)
-	}
-	sort.Strings(names)
-	for _, name := range names {
-		p.doDecl(p.ipkg, name)
+
+	for _, pkg := range pkgs {
+		if pkg.Complete() {
+			continue
+		}
+
+		names := make([]string, 0, len(p.pkgIndex[pkg]))
+		for name := range p.pkgIndex[pkg] {
+			names = append(names, name)
+		}
+		sort.Strings(names)
+		for _, name := range names {
+			p.doDecl(pkg, name)
+		}
+
+		// package was imported completely and without errors
+		pkg.MarkComplete()
 	}
 
 	for _, typ := range p.interfaceList {
 		typ.Complete()
 	}
 
-	// record all referenced packages as imports
-	list := append(([]*types.Package)(nil), pkgList[1:]...)
-	sort.Sort(byPath(list))
-	p.ipkg.SetImports(list)
-
-	// package was imported completely and without errors
-	p.ipkg.MarkComplete()
-
-	consumed, _ := r.Seek(0, io.SeekCurrent)
-	return int(consumed), p.ipkg, nil
+	return pkgs, nil
 }
 
 type iimporter struct {
 	ipath   string
-	ipkg    *types.Package
 	version int
 
 	stringData  []byte
@@ -227,9 +268,6 @@ func (p *iimporter) pkgAt(off uint64) *types.Package {
 		return pkg
 	}
 	path := p.stringAt(off)
-	if path == p.ipath {
-		return p.ipkg
-	}
 	errorf("missing package %q in %q", path, p.ipath)
 	return nil
 }
@@ -435,6 +473,14 @@ func (r *importReader) mpfloat(b *types.Basic) constant.Value {
 	switch {
 	case exp > 0:
 		x = constant.Shift(x, token.SHL, uint(exp))
+		// Ensure that the imported Kind is Float, else this constant may run into
+		// bitsize limits on overlarge integers. Eventually we can instead adopt
+		// the approach of CL 288632, but that CL relies on go/constant APIs that
+		// were introduced in go1.13.
+		//
+		// TODO(rFindley): sync the logic here with tip Go once we no longer
+		// support go1.12.
+		x = constant.ToFloat(x)
 	case exp < 0:
 		d := constant.Shift(constant.MakeInt64(1), token.SHL, uint(-exp))
 		x = constant.BinaryOp(x, token.QUO, d)

vendor/golang.org/x/tools/go/internal/gcimporter/newInterface10.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !go1.11
 // +build !go1.11
 
 package gcimporter

vendor/golang.org/x/tools/go/internal/gcimporter/newInterface11.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build go1.11
 // +build go1.11
 
 package gcimporter

vendor/golang.org/x/tools/go/internal/packagesdriver/sizes.go

@@ -22,7 +22,7 @@ func GetSizesGolist(ctx context.Context, inv gocommand.Invocation, gocmdRunner *
 	stdout, stderr, friendlyErr, rawErr := gocmdRunner.RunRaw(ctx, inv)
 	var goarch, compiler string
 	if rawErr != nil {
-		if strings.Contains(rawErr.Error(), "cannot find main module") {
+		if rawErrMsg := rawErr.Error(); strings.Contains(rawErrMsg, "cannot find main module") || strings.Contains(rawErrMsg, "go.mod file not found") {
 			// User's running outside of a module. All bets are off. Get GOARCH and guess compiler is gc.
 			// TODO(matloob): Is this a problem in practice?
 			inv.Verb = "env"

vendor/golang.org/x/tools/go/packages/golist.go

@@ -10,7 +10,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"go/types"
-	exec "golang.org/x/sys/execabs"
 	"io/ioutil"
 	"log"
 	"os"
@@ -23,8 +22,10 @@ import (
 	"sync"
 	"unicode"
 
+	exec "golang.org/x/sys/execabs"
 	"golang.org/x/tools/go/internal/packagesdriver"
 	"golang.org/x/tools/internal/gocommand"
+	"golang.org/x/tools/internal/packagesinternal"
 	"golang.org/x/xerrors"
 )
 
@@ -413,7 +414,8 @@ type jsonPackage struct {
 	ForTest           string // q in a "p [q.test]" package, else ""
 	DepOnly           bool
 
-	Error *jsonPackageError
+	Error      *packagesinternal.PackageError
+	DepsErrors []*packagesinternal.PackageError
 }
 
 type jsonPackageError struct {
@@ -565,6 +567,7 @@ func (state *golistState) createDriverResponse(words ...string) (*driverResponse
 			OtherFiles:      absJoin(p.Dir, otherFiles(p)...),
 			IgnoredFiles:    absJoin(p.Dir, p.IgnoredGoFiles, p.IgnoredOtherFiles),
 			forTest:         p.ForTest,
+			depsErrors:      p.DepsErrors,
 			Module:          p.Module,
 		}
 
@@ -581,7 +584,7 @@ func (state *golistState) createDriverResponse(words ...string) (*driverResponse
 				// golang/go#38990: go list silently fails to do cgo processing
 				pkg.CompiledGoFiles = nil
 				pkg.Errors = append(pkg.Errors, Error{
-					Msg:  "go list failed to return CompiledGoFiles; https://golang.org/issue/38990?",
+					Msg:  "go list failed to return CompiledGoFiles. This may indicate failure to perform cgo processing; try building at the command line. See https://golang.org/issue/38990.",
 					Kind: ListError,
 				})
 			}
@@ -865,7 +868,7 @@ func (state *golistState) invokeGo(verb string, args ...string) (*bytes.Buffer,
 	if gocmdRunner == nil {
 		gocmdRunner = &gocommand.Runner{}
 	}
-	stdout, stderr, _, err := gocmdRunner.RunRaw(cfg.Context, inv)
+	stdout, stderr, friendlyErr, err := gocmdRunner.RunRaw(cfg.Context, inv)
 	if err != nil {
 		// Check for 'go' executable not being found.
 		if ee, ok := err.(*exec.Error); ok && ee.Err == exec.ErrNotFound {
@@ -886,7 +889,7 @@ func (state *golistState) invokeGo(verb string, args ...string) (*bytes.Buffer,
 
 		// Related to #24854
 		if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "unexpected directory layout") {
-			return nil, fmt.Errorf("%s", stderr.String())
+			return nil, friendlyErr
 		}
 
 		// Is there an error running the C compiler in cgo? This will be reported in the "Error" field
@@ -999,7 +1002,7 @@ func (state *golistState) invokeGo(verb string, args ...string) (*bytes.Buffer,
 		// TODO(matloob): Remove these once we can depend on go list to exit with a zero status with -e even when
 		// packages don't exist or a build fails.
 		if !usesExportData(cfg) && !containsGoFile(args) {
-			return nil, fmt.Errorf("go %v: %s: %s", args, exitErr, stderr)
+			return nil, friendlyErr
 		}
 	}
 	return stdout, nil

vendor/golang.org/x/tools/go/packages/packages.go

@@ -339,6 +339,9 @@ type Package struct {
 	// forTest is the package under test, if any.
 	forTest string
 
+	// depsErrors is the DepsErrors field from the go list response, if any.
+	depsErrors []*packagesinternal.PackageError
+
 	// module is the module information for the package if it exists.
 	Module *Module
 }
@@ -366,6 +369,9 @@ func init() {
 	packagesinternal.GetForTest = func(p interface{}) string {
 		return p.(*Package).forTest
 	}
+	packagesinternal.GetDepsErrors = func(p interface{}) []*packagesinternal.PackageError {
+		return p.(*Package).depsErrors
+	}
 	packagesinternal.GetGoCmdRunner = func(config interface{}) *gocommand.Runner {
 		return config.(*Config).gocmdRunner
 	}

vendor/golang.org/x/tools/internal/event/label/label.go

@@ -96,6 +96,8 @@ func Of64(k Key, v uint64) Label { return Label{key: k, packed: v} }
 // access should be done with the From method of the key.
 func (t Label) Unpack64() uint64 { return t.packed }
 
+type stringptr unsafe.Pointer
+
 // OfString creates a new label from a key and a string.
 // This method is for implementing new key types, label creation should
 // normally be done with the Of method of the key.
@@ -104,7 +106,7 @@ func OfString(k Key, v string) Label {
 	return Label{
 		key:     k,
 		packed:  uint64(hdr.Len),
-		untyped: unsafe.Pointer(hdr.Data),
+		untyped: stringptr(hdr.Data),
 	}
 }
 
@@ -115,9 +117,9 @@ func OfString(k Key, v string) Label {
 func (t Label) UnpackString() string {
 	var v string
 	hdr := (*reflect.StringHeader)(unsafe.Pointer(&v))
-	hdr.Data = uintptr(t.untyped.(unsafe.Pointer))
+	hdr.Data = uintptr(t.untyped.(stringptr))
 	hdr.Len = int(t.packed)
-	return *(*string)(unsafe.Pointer(hdr))
+	return v
 }
 
 // Valid returns true if the Label is a valid one (it has a key).

vendor/golang.org/x/tools/internal/fastwalk/fastwalk_dirent_fileno.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build freebsd || openbsd || netbsd
 // +build freebsd openbsd netbsd
 
 package fastwalk

vendor/golang.org/x/tools/internal/fastwalk/fastwalk_dirent_ino.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build (linux || darwin) && !appengine
 // +build linux darwin
 // +build !appengine
 

vendor/golang.org/x/tools/internal/fastwalk/fastwalk_dirent_namlen_bsd.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build darwin || freebsd || openbsd || netbsd
 // +build darwin freebsd openbsd netbsd
 
 package fastwalk

vendor/golang.org/x/tools/internal/fastwalk/fastwalk_dirent_namlen_linux.go

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build linux
-// +build !appengine
+//go:build linux && !appengine
+// +build linux,!appengine
 
 package fastwalk
 

vendor/golang.org/x/tools/internal/fastwalk/fastwalk_portable.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build appengine || (!linux && !darwin && !freebsd && !openbsd && !netbsd)
 // +build appengine !linux,!darwin,!freebsd,!openbsd,!netbsd
 
 package fastwalk

vendor/golang.org/x/tools/internal/fastwalk/fastwalk_unix.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build (linux || darwin || freebsd || openbsd || netbsd) && !appengine
 // +build linux darwin freebsd openbsd netbsd
 // +build !appengine
 
@@ -21,7 +22,7 @@ const blockSize = 8 << 10
 const unknownFileMode os.FileMode = os.ModeNamedPipe | os.ModeSocket | os.ModeDevice
 
 func readDir(dirName string, fn func(dirName, entName string, typ os.FileMode) error) error {
-	fd, err := syscall.Open(dirName, 0, 0)
+	fd, err := open(dirName, 0, 0)
 	if err != nil {
 		return &os.PathError{Op: "open", Path: dirName, Err: err}
 	}
@@ -35,7 +36,7 @@ func readDir(dirName string, fn func(dirName, entName string, typ os.FileMode) e
 	for {
 		if bufp >= nbuf {
 			bufp = 0
-			nbuf, err = syscall.ReadDirent(fd, buf)
+			nbuf, err = readDirent(fd, buf)
 			if err != nil {
 				return os.NewSyscallError("readdirent", err)
 			}
@@ -126,3 +127,27 @@ func parseDirEnt(buf []byte) (consumed int, name string, typ os.FileMode) {
 	}
 	return
 }
+
+// According to https://golang.org/doc/go1.14#runtime
+// A consequence of the implementation of preemption is that on Unix systems, including Linux and macOS
+// systems, programs built with Go 1.14 will receive more signals than programs built with earlier releases.
+//
+// This causes syscall.Open and syscall.ReadDirent sometimes fail with EINTR errors.
+// We need to retry in this case.
+func open(path string, mode int, perm uint32) (fd int, err error) {
+	for {
+		fd, err := syscall.Open(path, mode, perm)
+		if err != syscall.EINTR {
+			return fd, err
+		}
+	}
+}
+
+func readDirent(fd int, buf []byte) (n int, err error) {
+	for {
+		nbuf, err := syscall.ReadDirent(fd, buf)
+		if err != syscall.EINTR {
+			return nbuf, err
+		}
+	}
+}

vendor/golang.org/x/tools/internal/gocommand/vendor.go

@@ -12,6 +12,7 @@ import (
 	"path/filepath"
 	"regexp"
 	"strings"
+	"time"
 
 	"golang.org/x/mod/semver"
 )
@@ -19,11 +20,15 @@ import (
 // ModuleJSON holds information about a module.
 type ModuleJSON struct {
 	Path      string      // module path
+	Version   string      // module version
+	Versions  []string    // available module versions (with -versions)
 	Replace   *ModuleJSON // replaced by this module
+	Time      *time.Time  // time version was created
+	Update    *ModuleJSON // available update, if any (with -u)
 	Main      bool        // is this the main module?
 	Indirect  bool        // is this module only an indirect dependency of main module?
 	Dir       string      // directory holding files for this module, if any
-	GoMod     string      // path to go.mod file for this module, if any
+	GoMod     string      // path to go.mod file used when loading this module, if any
 	GoVersion string      // go version used in module
 }
 

vendor/golang.org/x/tools/internal/gocommand/version.go

@@ -14,7 +14,7 @@ import (
 // It returns the X in Go 1.X.
 func GoVersion(ctx context.Context, inv Invocation, r *Runner) (int, error) {
 	inv.Verb = "list"
-	inv.Args = []string{"-e", "-f", `{{context.ReleaseTags}}`}
+	inv.Args = []string{"-e", "-f", `{{context.ReleaseTags}}`, `--`, `unsafe`}
 	inv.Env = append(append([]string{}, inv.Env...), "GO111MODULE=off")
 	// Unset any unneeded flags, and remove them from BuildFlags, if they're
 	// present.

vendor/golang.org/x/tools/internal/imports/mod.go

@@ -89,8 +89,10 @@ func (r *ModuleResolver) init() error {
 		err := r.initAllMods()
 		// We expect an error when running outside of a module with
 		// GO111MODULE=on. Other errors are fatal.
-		if err != nil && !strings.Contains(err.Error(), "working directory is not part of a module") {
-			return err
+		if err != nil {
+			if errMsg := err.Error(); !strings.Contains(errMsg, "working directory is not part of a module") && !strings.Contains(errMsg, "go.mod file not found") {
+				return err
+			}
 		}
 	}
 

vendor/golang.org/x/tools/internal/imports/zstdlib.go

@@ -974,13 +974,29 @@ var stdlib = map[string][]string{
 		"DF_STATIC_TLS",
 		"DF_SYMBOLIC",
 		"DF_TEXTREL",
+		"DT_ADDRRNGHI",
+		"DT_ADDRRNGLO",
+		"DT_AUDIT",
+		"DT_AUXILIARY",
 		"DT_BIND_NOW",
+		"DT_CHECKSUM",
+		"DT_CONFIG",
 		"DT_DEBUG",
+		"DT_DEPAUDIT",
 		"DT_ENCODING",
+		"DT_FEATURE",
+		"DT_FILTER",
 		"DT_FINI",
 		"DT_FINI_ARRAY",
 		"DT_FINI_ARRAYSZ",
 		"DT_FLAGS",
+		"DT_FLAGS_1",
+		"DT_GNU_CONFLICT",
+		"DT_GNU_CONFLICTSZ",
+		"DT_GNU_HASH",
+		"DT_GNU_LIBLIST",
+		"DT_GNU_LIBLISTSZ",
+		"DT_GNU_PRELINKED",
 		"DT_HASH",
 		"DT_HIOS",
 		"DT_HIPROC",
@@ -990,28 +1006,100 @@ var stdlib = map[string][]string{
 		"DT_JMPREL",
 		"DT_LOOS",
 		"DT_LOPROC",
+		"DT_MIPS_AUX_DYNAMIC",
+		"DT_MIPS_BASE_ADDRESS",
+		"DT_MIPS_COMPACT_SIZE",
+		"DT_MIPS_CONFLICT",
+		"DT_MIPS_CONFLICTNO",
+		"DT_MIPS_CXX_FLAGS",
+		"DT_MIPS_DELTA_CLASS",
+		"DT_MIPS_DELTA_CLASSSYM",
+		"DT_MIPS_DELTA_CLASSSYM_NO",
+		"DT_MIPS_DELTA_CLASS_NO",
+		"DT_MIPS_DELTA_INSTANCE",
+		"DT_MIPS_DELTA_INSTANCE_NO",
+		"DT_MIPS_DELTA_RELOC",
+		"DT_MIPS_DELTA_RELOC_NO",
+		"DT_MIPS_DELTA_SYM",
+		"DT_MIPS_DELTA_SYM_NO",
+		"DT_MIPS_DYNSTR_ALIGN",
+		"DT_MIPS_FLAGS",
+		"DT_MIPS_GOTSYM",
+		"DT_MIPS_GP_VALUE",
+		"DT_MIPS_HIDDEN_GOTIDX",
+		"DT_MIPS_HIPAGENO",
+		"DT_MIPS_ICHECKSUM",
+		"DT_MIPS_INTERFACE",
+		"DT_MIPS_INTERFACE_SIZE",
+		"DT_MIPS_IVERSION",
+		"DT_MIPS_LIBLIST",
+		"DT_MIPS_LIBLISTNO",
+		"DT_MIPS_LOCALPAGE_GOTIDX",
+		"DT_MIPS_LOCAL_GOTIDX",
+		"DT_MIPS_LOCAL_GOTNO",
+		"DT_MIPS_MSYM",
+		"DT_MIPS_OPTIONS",
+		"DT_MIPS_PERF_SUFFIX",
+		"DT_MIPS_PIXIE_INIT",
+		"DT_MIPS_PLTGOT",
+		"DT_MIPS_PROTECTED_GOTIDX",
+		"DT_MIPS_RLD_MAP",
+		"DT_MIPS_RLD_MAP_REL",
+		"DT_MIPS_RLD_TEXT_RESOLVE_ADDR",
+		"DT_MIPS_RLD_VERSION",
+		"DT_MIPS_RWPLT",
+		"DT_MIPS_SYMBOL_LIB",
+		"DT_MIPS_SYMTABNO",
+		"DT_MIPS_TIME_STAMP",
+		"DT_MIPS_UNREFEXTNO",
+		"DT_MOVEENT",
+		"DT_MOVESZ",
+		"DT_MOVETAB",
 		"DT_NEEDED",
 		"DT_NULL",
 		"DT_PLTGOT",
+		"DT_PLTPAD",
+		"DT_PLTPADSZ",
 		"DT_PLTREL",
 		"DT_PLTRELSZ",
+		"DT_POSFLAG_1",
+		"DT_PPC64_GLINK",
+		"DT_PPC64_OPD",
+		"DT_PPC64_OPDSZ",
+		"DT_PPC64_OPT",
+		"DT_PPC_GOT",
+		"DT_PPC_OPT",
 		"DT_PREINIT_ARRAY",
 		"DT_PREINIT_ARRAYSZ",
 		"DT_REL",
 		"DT_RELA",
+		"DT_RELACOUNT",
 		"DT_RELAENT",
 		"DT_RELASZ",
+		"DT_RELCOUNT",
 		"DT_RELENT",
 		"DT_RELSZ",
 		"DT_RPATH",
 		"DT_RUNPATH",
 		"DT_SONAME",
+		"DT_SPARC_REGISTER",
 		"DT_STRSZ",
 		"DT_STRTAB",
 		"DT_SYMBOLIC",
 		"DT_SYMENT",
+		"DT_SYMINENT",
+		"DT_SYMINFO",
+		"DT_SYMINSZ",
 		"DT_SYMTAB",
+		"DT_SYMTAB_SHNDX",
 		"DT_TEXTREL",
+		"DT_TLSDESC_GOT",
+		"DT_TLSDESC_PLT",
+		"DT_USED",
+		"DT_VALRNGHI",
+		"DT_VALRNGLO",
+		"DT_VERDEF",
+		"DT_VERDEFNUM",
 		"DT_VERNEED",
 		"DT_VERNEEDNUM",
 		"DT_VERSYM",
@@ -1271,17 +1359,38 @@ var stdlib = map[string][]string{
 		"PF_R",
 		"PF_W",
 		"PF_X",
+		"PT_AARCH64_ARCHEXT",
+		"PT_AARCH64_UNWIND",
+		"PT_ARM_ARCHEXT",
+		"PT_ARM_EXIDX",
 		"PT_DYNAMIC",
+		"PT_GNU_EH_FRAME",
+		"PT_GNU_MBIND_HI",
+		"PT_GNU_MBIND_LO",
+		"PT_GNU_PROPERTY",
+		"PT_GNU_RELRO",
+		"PT_GNU_STACK",
 		"PT_HIOS",
 		"PT_HIPROC",
 		"PT_INTERP",
 		"PT_LOAD",
 		"PT_LOOS",
 		"PT_LOPROC",
+		"PT_MIPS_ABIFLAGS",
+		"PT_MIPS_OPTIONS",
+		"PT_MIPS_REGINFO",
+		"PT_MIPS_RTPROC",
 		"PT_NOTE",
 		"PT_NULL",
+		"PT_OPENBSD_BOOTDATA",
+		"PT_OPENBSD_RANDOMIZE",
+		"PT_OPENBSD_WXNEEDED",
+		"PT_PAX_FLAGS",
 		"PT_PHDR",
+		"PT_S390_PGSTE",
 		"PT_SHLIB",
+		"PT_SUNWSTACK",
+		"PT_SUNW_EH_FRAME",
 		"PT_TLS",
 		"Prog",
 		"Prog32",
@@ -2445,6 +2554,9 @@ var stdlib = map[string][]string{
 		"SectionHeader",
 		"Sym",
 	},
+	"embed": []string{
+		"FS",
+	},
 	"encoding": []string{
 		"BinaryMarshaler",
 		"BinaryUnmarshaler",
@@ -2680,6 +2792,7 @@ var stdlib = map[string][]string{
 		"FlagSet",
 		"Float64",
 		"Float64Var",
+		"Func",
 		"Getter",
 		"Int",
 		"Int64",
@@ -2853,6 +2966,18 @@ var stdlib = map[string][]string{
 		"Package",
 		"ToolDir",
 	},
+	"go/build/constraint": []string{
+		"AndExpr",
+		"Expr",
+		"IsGoBuild",
+		"IsPlusBuild",
+		"NotExpr",
+		"OrExpr",
+		"Parse",
+		"PlusBuildLines",
+		"SyntaxError",
+		"TagExpr",
+	},
 	"go/constant": []string{
 		"BinaryOp",
 		"BitLen",
@@ -3273,6 +3398,7 @@ var stdlib = map[string][]string{
 		"Must",
 		"New",
 		"OK",
+		"ParseFS",
 		"ParseFiles",
 		"ParseGlob",
 		"Srcset",
@@ -3432,6 +3558,7 @@ var stdlib = map[string][]string{
 		"Copy",
 		"CopyBuffer",
 		"CopyN",
+		"Discard",
 		"EOF",
 		"ErrClosedPipe",
 		"ErrNoProgress",
@@ -3443,12 +3570,15 @@ var stdlib = map[string][]string{
 		"MultiReader",
 		"MultiWriter",
 		"NewSectionReader",
+		"NopCloser",
 		"Pipe",
 		"PipeReader",
 		"PipeWriter",
+		"ReadAll",
 		"ReadAtLeast",
 		"ReadCloser",
 		"ReadFull",
+		"ReadSeekCloser",
 		"ReadSeeker",
 		"ReadWriteCloser",
 		"ReadWriteSeeker",
@@ -3472,6 +3602,49 @@ var stdlib = map[string][]string{
 		"WriterAt",
 		"WriterTo",
 	},
+	"io/fs": []string{
+		"DirEntry",
+		"ErrClosed",
+		"ErrExist",
+		"ErrInvalid",
+		"ErrNotExist",
+		"ErrPermission",
+		"FS",
+		"File",
+		"FileInfo",
+		"FileMode",
+		"Glob",
+		"GlobFS",
+		"ModeAppend",
+		"ModeCharDevice",
+		"ModeDevice",
+		"ModeDir",
+		"ModeExclusive",
+		"ModeIrregular",
+		"ModeNamedPipe",
+		"ModePerm",
+		"ModeSetgid",
+		"ModeSetuid",
+		"ModeSocket",
+		"ModeSticky",
+		"ModeSymlink",
+		"ModeTemporary",
+		"ModeType",
+		"PathError",
+		"ReadDir",
+		"ReadDirFS",
+		"ReadDirFile",
+		"ReadFile",
+		"ReadFileFS",
+		"SkipDir",
+		"Stat",
+		"StatFS",
+		"Sub",
+		"SubFS",
+		"ValidPath",
+		"WalkDir",
+		"WalkDirFunc",
+	},
 	"io/ioutil": []string{
 		"Discard",
 		"NopCloser",
@@ -3483,6 +3656,7 @@ var stdlib = map[string][]string{
 		"WriteFile",
 	},
 	"log": []string{
+		"Default",
 		"Fatal",
 		"Fatalf",
 		"Fatalln",
@@ -3819,6 +3993,7 @@ var stdlib = map[string][]string{
 		"DialUDP",
 		"DialUnix",
 		"Dialer",
+		"ErrClosed",
 		"ErrWriteToConnected",
 		"Error",
 		"FileConn",
@@ -3938,6 +4113,7 @@ var stdlib = map[string][]string{
 		"ErrUseLastResponse",
 		"ErrWriteAfterFlush",
 		"Error",
+		"FS",
 		"File",
 		"FileServer",
 		"FileSystem",
@@ -4234,7 +4410,10 @@ var stdlib = map[string][]string{
 		"Chtimes",
 		"Clearenv",
 		"Create",
+		"CreateTemp",
 		"DevNull",
+		"DirEntry",
+		"DirFS",
 		"Environ",
 		"ErrClosed",
 		"ErrDeadlineExceeded",
@@ -4243,6 +4422,7 @@ var stdlib = map[string][]string{
 		"ErrNoDeadline",
 		"ErrNotExist",
 		"ErrPermission",
+		"ErrProcessDone",
 		"Executable",
 		"Exit",
 		"Expand",
@@ -4276,6 +4456,7 @@ var stdlib = map[string][]string{
 		"Lstat",
 		"Mkdir",
 		"MkdirAll",
+		"MkdirTemp",
 		"ModeAppend",
 		"ModeCharDevice",
 		"ModeDevice",
@@ -4310,6 +4491,8 @@ var stdlib = map[string][]string{
 		"ProcAttr",
 		"Process",
 		"ProcessState",
+		"ReadDir",
+		"ReadFile",
 		"Readlink",
 		"Remove",
 		"RemoveAll",
@@ -4333,6 +4516,7 @@ var stdlib = map[string][]string{
 		"UserCacheDir",
 		"UserConfigDir",
 		"UserHomeDir",
+		"WriteFile",
 	},
 	"os/exec": []string{
 		"Cmd",
@@ -4347,6 +4531,7 @@ var stdlib = map[string][]string{
 		"Ignore",
 		"Ignored",
 		"Notify",
+		"NotifyContext",
 		"Reset",
 		"Stop",
 	},
@@ -4397,6 +4582,7 @@ var stdlib = map[string][]string{
 		"ToSlash",
 		"VolumeName",
 		"Walk",
+		"WalkDir",
 		"WalkFunc",
 	},
 	"plugin": []string{
@@ -4629,6 +4815,19 @@ var stdlib = map[string][]string{
 		"Stack",
 		"WriteHeapDump",
 	},
+	"runtime/metrics": []string{
+		"All",
+		"Description",
+		"Float64Histogram",
+		"KindBad",
+		"KindFloat64",
+		"KindFloat64Histogram",
+		"KindUint64",
+		"Read",
+		"Sample",
+		"Value",
+		"ValueKind",
+	},
 	"runtime/pprof": []string{
 		"Do",
 		"ForLabels",
@@ -5012,6 +5211,8 @@ var stdlib = map[string][]string{
 		"AddrinfoW",
 		"Adjtime",
 		"Adjtimex",
+		"AllThreadsSyscall",
+		"AllThreadsSyscall6",
 		"AttachLsf",
 		"B0",
 		"B1000000",
@@ -10010,13 +10211,20 @@ var stdlib = map[string][]string{
 		"TB",
 		"Verbose",
 	},
+	"testing/fstest": []string{
+		"MapFS",
+		"MapFile",
+		"TestFS",
+	},
 	"testing/iotest": []string{
 		"DataErrReader",
+		"ErrReader",
 		"ErrTimeout",
 		"HalfReader",
 		"NewReadLogger",
 		"NewWriteLogger",
 		"OneByteReader",
+		"TestReader",
 		"TimeoutReader",
 		"TruncateWriter",
 	},
@@ -10076,6 +10284,7 @@ var stdlib = map[string][]string{
 		"JSEscaper",
 		"Must",
 		"New",
+		"ParseFS",
 		"ParseFiles",
 		"ParseGlob",
 		"Template",
@@ -10087,12 +10296,14 @@ var stdlib = map[string][]string{
 		"BranchNode",
 		"ChainNode",
 		"CommandNode",
+		"CommentNode",
 		"DotNode",
 		"FieldNode",
 		"IdentifierNode",
 		"IfNode",
 		"IsEmptyTree",
 		"ListNode",
+		"Mode",
 		"New",
 		"NewIdentifier",
 		"NilNode",
@@ -10101,6 +10312,7 @@ var stdlib = map[string][]string{
 		"NodeBool",
 		"NodeChain",
 		"NodeCommand",
+		"NodeComment",
 		"NodeDot",
 		"NodeField",
 		"NodeIdentifier",
@@ -10118,6 +10330,7 @@ var stdlib = map[string][]string{
 		"NodeWith",
 		"NumberNode",
 		"Parse",
+		"ParseComments",
 		"PipeNode",
 		"Pos",
 		"RangeNode",
@@ -10230,6 +10443,7 @@ var stdlib = map[string][]string{
 		"Chakma",
 		"Cham",
 		"Cherokee",
+		"Chorasmian",
 		"Co",
 		"Common",
 		"Coptic",
@@ -10243,6 +10457,7 @@ var stdlib = map[string][]string{
 		"Devanagari",
 		"Diacritic",
 		"Digit",
+		"Dives_Akuru",
 		"Dogra",
 		"Duployan",
 		"Egyptian_Hieroglyphs",
@@ -10300,6 +10515,7 @@ var stdlib = map[string][]string{
 		"Katakana",
 		"Kayah_Li",
 		"Kharoshthi",
+		"Khitan_Small_Script",
 		"Khmer",
 		"Khojki",
 		"Khudawadi",
@@ -10472,6 +10688,7 @@ var stdlib = map[string][]string{
 		"Wancho",
 		"Warang_Citi",
 		"White_Space",
+		"Yezidi",
 		"Yi",
 		"Z",
 		"Zanabazar_Square",

vendor/golang.org/x/tools/internal/packagesinternal/packages.go

@@ -10,6 +10,13 @@ import (
 )
 
 var GetForTest = func(p interface{}) string { return "" }
+var GetDepsErrors = func(p interface{}) []*PackageError { return nil }
+
+type PackageError struct {
+	ImportStack []string // shortest path from package named on command line to this one
+	Pos         string   // position of error (if present, file:line:col)
+	Err         string   // the error itself
+}
 
 var GetGoCmdRunner = func(config interface{}) *gocommand.Runner { return nil }
 

vendor/golang.org/x/tools/internal/typeparams/doc.go

@@ -0,0 +1,11 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package typeparams provides functions to work indirectly with type parameter
+// data stored in go/ast and go/types objects, while these API are guarded by a
+// build constraint.
+//
+// This package exists to make it easier for tools to work with generic code,
+// while also compiling against older Go versions.
+package typeparams

vendor/golang.org/x/tools/internal/typeparams/notypeparams.go

@@ -0,0 +1,90 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !typeparams || !go1.17
+// +build !typeparams !go1.17
+
+package typeparams
+
+import (
+	"go/ast"
+	"go/types"
+)
+
+// NOTE: doc comments must be kept in sync with typeparams.go.
+
+// Enabled reports whether type parameters are enabled in the current build
+// environment.
+const Enabled = false
+
+// UnpackIndex extracts all index expressions from e. For non-generic code this
+// is always one expression: e.Index, but may be more than one expression for
+// generic type instantiation.
+func UnpackIndex(e *ast.IndexExpr) []ast.Expr {
+	return []ast.Expr{e.Index}
+}
+
+// IsListExpr reports whether n is an *ast.ListExpr, which is a new node type
+// introduced to hold type arguments for generic type instantiation.
+func IsListExpr(n ast.Node) bool {
+	return false
+}
+
+// ForTypeDecl extracts the (possibly nil) type parameter node list from n.
+func ForTypeDecl(*ast.TypeSpec) *ast.FieldList {
+	return nil
+}
+
+// ForFuncDecl extracts the (possibly nil) type parameter node list from n.
+func ForFuncDecl(*ast.FuncDecl) *ast.FieldList {
+	return nil
+}
+
+// ForSignature extracts the (possibly empty) type parameter object list from
+// sig.
+func ForSignature(*types.Signature) []*types.TypeName {
+	return nil
+}
+
+// HasTypeSet reports if iface has a type set.
+func HasTypeSet(*types.Interface) bool {
+	return false
+}
+
+// IsComparable reports if iface is the comparable interface.
+func IsComparable(*types.Interface) bool {
+	return false
+}
+
+// IsConstraint reports whether iface may only be used as a type parameter
+// constraint (i.e. has a type set or is the comparable interface).
+func IsConstraint(*types.Interface) bool {
+	return false
+}
+
+// ForNamed extracts the (possibly empty) type parameter object list from
+// named.
+func ForNamed(*types.Named) []*types.TypeName {
+	return nil
+}
+
+// NamedTArgs extracts the (possibly empty) type argument list from named.
+func NamedTArgs(*types.Named) []types.Type {
+	return nil
+}
+
+// InitInferred initializes info to record inferred type information.
+func InitInferred(*types.Info) {
+}
+
+// GetInferred extracts inferred type information from info for e.
+//
+// The expression e may have an inferred type if it is an *ast.IndexExpr
+// representing partial instantiation of a generic function type for which type
+// arguments have been inferred using constraint type inference, or if it is an
+// *ast.CallExpr for which type type arguments have be inferred using both
+// constraint type inference and function argument inference.
+func GetInferred(*types.Info, ast.Expr) ([]types.Type, *types.Signature) {
+	return nil, nil
+}

vendor/golang.org/x/tools/internal/typeparams/typeparams.go

@@ -0,0 +1,105 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build typeparams && go1.17
+// +build typeparams,go1.17
+
+package typeparams
+
+import (
+	"go/ast"
+	"go/types"
+)
+
+// NOTE: doc comments must be kept in sync with notypeparams.go.
+
+// Enabled reports whether type parameters are enabled in the current build
+// environment.
+const Enabled = true
+
+// UnpackIndex extracts all index expressions from e. For non-generic code this
+// is always one expression: e.Index, but may be more than one expression for
+// generic type instantiation.
+func UnpackIndex(e *ast.IndexExpr) []ast.Expr {
+	if x, _ := e.Index.(*ast.ListExpr); x != nil {
+		return x.ElemList
+	}
+	if e.Index != nil {
+		return []ast.Expr{e.Index}
+	}
+	return nil
+}
+
+// IsListExpr reports whether n is an *ast.ListExpr, which is a new node type
+// introduced to hold type arguments for generic type instantiation.
+func IsListExpr(n ast.Node) bool {
+	_, ok := n.(*ast.ListExpr)
+	return ok
+}
+
+// ForTypeDecl extracts the (possibly nil) type parameter node list from n.
+func ForTypeDecl(n *ast.TypeSpec) *ast.FieldList {
+	return n.TParams
+}
+
+// ForFuncDecl extracts the (possibly nil) type parameter node list from n.
+func ForFuncDecl(n *ast.FuncDecl) *ast.FieldList {
+	if n.Type != nil {
+		return n.Type.TParams
+	}
+	return nil
+}
+
+// ForSignature extracts the (possibly empty) type parameter object list from
+// sig.
+func ForSignature(sig *types.Signature) []*types.TypeName {
+	return sig.TParams()
+}
+
+// HasTypeSet reports if iface has a type set.
+func HasTypeSet(iface *types.Interface) bool {
+	return iface.HasTypeList()
+}
+
+// IsComparable reports if iface is the comparable interface.
+func IsComparable(iface *types.Interface) bool {
+	return iface.IsComparable()
+}
+
+// IsConstraint reports whether iface may only be used as a type parameter
+// constraint (i.e. has a type set or is the comparable interface).
+func IsConstraint(iface *types.Interface) bool {
+	return iface.IsConstraint()
+}
+
+// ForNamed extracts the (possibly empty) type parameter object list from
+// named.
+func ForNamed(named *types.Named) []*types.TypeName {
+	return named.TParams()
+}
+
+// NamedTArgs extracts the (possibly empty) type argument list from named.
+func NamedTArgs(named *types.Named) []types.Type {
+	return named.TArgs()
+}
+
+// InitInferred initializes info to record inferred type information.
+func InitInferred(info *types.Info) {
+	info.Inferred = make(map[ast.Expr]types.Inferred)
+}
+
+// GetInferred extracts inferred type information from info for e.
+//
+// The expression e may have an inferred type if it is an *ast.IndexExpr
+// representing partial instantiation of a generic function type for which type
+// arguments have been inferred using constraint type inference, or if it is an
+// *ast.CallExpr for which type type arguments have be inferred using both
+// constraint type inference and function argument inference.
+func GetInferred(info *types.Info, e ast.Expr) ([]types.Type, *types.Signature) {
+	if info.Inferred == nil {
+		return nil, nil
+	}
+	inf := info.Inferred[e]
+	return inf.TArgs, inf.Sig
+}

vendor/golang.org/x/tools/internal/typesinternal/errorcode.go

@@ -1209,6 +1209,16 @@ const (
 	//  }
 	InvalidTypeSwitch
 
+	// InvalidExprSwitch occurs when a switch expression is not comparable.
+	//
+	// Example:
+	//  func _() {
+	//  	var a struct{ _ func() }
+	//  	switch a /* ERROR cannot switch on a */ {
+	//  	}
+	//  }
+	InvalidExprSwitch
+
 	/* control flow > select */
 
 	// InvalidSelectCase occurs when a select case is not a channel send or

vendor/golang.org/x/tools/internal/typesinternal/errorcode_string.go

@@ -124,24 +124,25 @@ func _() {
 	_ = x[DuplicateDefault-114]
 	_ = x[BadTypeKeyword-115]
 	_ = x[InvalidTypeSwitch-116]
-	_ = x[InvalidSelectCase-117]
-	_ = x[UndeclaredLabel-118]
-	_ = x[DuplicateLabel-119]
-	_ = x[MisplacedLabel-120]
-	_ = x[UnusedLabel-121]
-	_ = x[JumpOverDecl-122]
-	_ = x[JumpIntoBlock-123]
-	_ = x[InvalidMethodExpr-124]
-	_ = x[WrongArgCount-125]
-	_ = x[InvalidCall-126]
-	_ = x[UnusedResults-127]
-	_ = x[InvalidDefer-128]
-	_ = x[InvalidGo-129]
+	_ = x[InvalidExprSwitch-117]
+	_ = x[InvalidSelectCase-118]
+	_ = x[UndeclaredLabel-119]
+	_ = x[DuplicateLabel-120]
+	_ = x[MisplacedLabel-121]
+	_ = x[UnusedLabel-122]
+	_ = x[JumpOverDecl-123]
+	_ = x[JumpIntoBlock-124]
+	_ = x[InvalidMethodExpr-125]
+	_ = x[WrongArgCount-126]
+	_ = x[InvalidCall-127]
+	_ = x[UnusedResults-128]
+	_ = x[InvalidDefer-129]
+	_ = x[InvalidGo-130]
 }
 
-const _ErrorCode_name = "TestBlankPkgNameMismatchedPkgNameInvalidPkgUseBadImportPathBrokenImportImportCRenamedUnusedImportInvalidInitCycleDuplicateDeclInvalidDeclCycleInvalidTypeCycleInvalidConstInitInvalidConstValInvalidConstTypeUntypedNilWrongAssignCountUnassignableOperandNoNewVarMultiValAssignOpInvalidIfaceAssignInvalidChanAssignIncompatibleAssignUnaddressableFieldAssignNotATypeInvalidArrayLenBlankIfaceMethodIncomparableMapKeyInvalidIfaceEmbedInvalidPtrEmbedBadRecvInvalidRecvDuplicateFieldAndMethodDuplicateMethodInvalidBlankInvalidIotaMissingInitBodyInvalidInitSigInvalidInitDeclInvalidMainDeclTooManyValuesNotAnExprTruncatedFloatNumericOverflowUndefinedOpMismatchedTypesDivByZeroNonNumericIncDecUnaddressableOperandInvalidIndirectionNonIndexableOperandInvalidIndexSwappedSliceIndicesNonSliceableOperandInvalidSliceExprInvalidShiftCountInvalidShiftOperandInvalidReceiveInvalidSendDuplicateLitKeyMissingLitKeyInvalidLitIndexOversizeArrayLitMixedStructLitInvalidStructLitMissingLitFieldDuplicateLitFieldUnexportedLitFieldInvalidLitFieldUntypedLitInvalidLitAmbiguousSelectorUndeclaredImportedNameUnexportedNameUndeclaredNameMissingFieldOrMethodBadDotDotDotSyntaxNonVariadicDotDotDotMisplacedDotDotDotInvalidDotDotDotOperandInvalidDotDotDotUncalledBuiltinInvalidAppendInvalidCapInvalidCloseInvalidCopyInvalidComplexInvalidDeleteInvalidImagInvalidLenSwappedMakeArgsInvalidMakeInvalidRealInvalidAssertImpossibleAssertInvalidConversionInvalidUntypedConversionBadOffsetofSyntaxInvalidOffsetofUnusedExprUnusedVarMissingReturnWrongResultCountOutOfScopeResultInvalidCondInvalidPostDeclInvalidChanRangeInvalidIterVarInvalidRangeExprMisplacedBreakMisplacedContinueMisplacedFallthroughDuplicateCaseDuplicateDefaultBadTypeKeywordInvalidTypeSwitchInvalidSelectCaseUndeclaredLabelDuplicateLabelMisplacedLabelUnusedLabelJumpOverDeclJumpIntoBlockInvalidMethodExprWrongArgCountInvalidCallUnusedResultsInvalidDeferInvalidGo"
+const _ErrorCode_name = "TestBlankPkgNameMismatchedPkgNameInvalidPkgUseBadImportPathBrokenImportImportCRenamedUnusedImportInvalidInitCycleDuplicateDeclInvalidDeclCycleInvalidTypeCycleInvalidConstInitInvalidConstValInvalidConstTypeUntypedNilWrongAssignCountUnassignableOperandNoNewVarMultiValAssignOpInvalidIfaceAssignInvalidChanAssignIncompatibleAssignUnaddressableFieldAssignNotATypeInvalidArrayLenBlankIfaceMethodIncomparableMapKeyInvalidIfaceEmbedInvalidPtrEmbedBadRecvInvalidRecvDuplicateFieldAndMethodDuplicateMethodInvalidBlankInvalidIotaMissingInitBodyInvalidInitSigInvalidInitDeclInvalidMainDeclTooManyValuesNotAnExprTruncatedFloatNumericOverflowUndefinedOpMismatchedTypesDivByZeroNonNumericIncDecUnaddressableOperandInvalidIndirectionNonIndexableOperandInvalidIndexSwappedSliceIndicesNonSliceableOperandInvalidSliceExprInvalidShiftCountInvalidShiftOperandInvalidReceiveInvalidSendDuplicateLitKeyMissingLitKeyInvalidLitIndexOversizeArrayLitMixedStructLitInvalidStructLitMissingLitFieldDuplicateLitFieldUnexportedLitFieldInvalidLitFieldUntypedLitInvalidLitAmbiguousSelectorUndeclaredImportedNameUnexportedNameUndeclaredNameMissingFieldOrMethodBadDotDotDotSyntaxNonVariadicDotDotDotMisplacedDotDotDotInvalidDotDotDotOperandInvalidDotDotDotUncalledBuiltinInvalidAppendInvalidCapInvalidCloseInvalidCopyInvalidComplexInvalidDeleteInvalidImagInvalidLenSwappedMakeArgsInvalidMakeInvalidRealInvalidAssertImpossibleAssertInvalidConversionInvalidUntypedConversionBadOffsetofSyntaxInvalidOffsetofUnusedExprUnusedVarMissingReturnWrongResultCountOutOfScopeResultInvalidCondInvalidPostDeclInvalidChanRangeInvalidIterVarInvalidRangeExprMisplacedBreakMisplacedContinueMisplacedFallthroughDuplicateCaseDuplicateDefaultBadTypeKeywordInvalidTypeSwitchInvalidExprSwitchInvalidSelectCaseUndeclaredLabelDuplicateLabelMisplacedLabelUnusedLabelJumpOverDeclJumpIntoBlockInvalidMethodExprWrongArgCountInvalidCallUnusedResultsInvalidDeferInvalidGo"
 
-var _ErrorCode_index = [...]uint16{0, 4, 16, 33, 46, 59, 71, 85, 97, 113, 126, 142, 158, 174, 189, 205, 215, 231, 250, 258, 274, 292, 309, 327, 351, 359, 374, 390, 408, 425, 440, 447, 458, 481, 496, 508, 519, 534, 548, 563, 578, 591, 600, 614, 629, 640, 655, 664, 680, 700, 718, 737, 749, 768, 787, 803, 820, 839, 853, 864, 879, 892, 907, 923, 937, 953, 968, 985, 1003, 1018, 1028, 1038, 1055, 1077, 1091, 1105, 1125, 1143, 1163, 1181, 1204, 1220, 1235, 1248, 1258, 1270, 1281, 1295, 1308, 1319, 1329, 1344, 1355, 1366, 1379, 1395, 1412, 1436, 1453, 1468, 1478, 1487, 1500, 1516, 1532, 1543, 1558, 1574, 1588, 1604, 1618, 1635, 1655, 1668, 1684, 1698, 1715, 1732, 1747, 1761, 1775, 1786, 1798, 1811, 1828, 1841, 1852, 1865, 1877, 1886}
+var _ErrorCode_index = [...]uint16{0, 4, 16, 33, 46, 59, 71, 85, 97, 113, 126, 142, 158, 174, 189, 205, 215, 231, 250, 258, 274, 292, 309, 327, 351, 359, 374, 390, 408, 425, 440, 447, 458, 481, 496, 508, 519, 534, 548, 563, 578, 591, 600, 614, 629, 640, 655, 664, 680, 700, 718, 737, 749, 768, 787, 803, 820, 839, 853, 864, 879, 892, 907, 923, 937, 953, 968, 985, 1003, 1018, 1028, 1038, 1055, 1077, 1091, 1105, 1125, 1143, 1163, 1181, 1204, 1220, 1235, 1248, 1258, 1270, 1281, 1295, 1308, 1319, 1329, 1344, 1355, 1366, 1379, 1395, 1412, 1436, 1453, 1468, 1478, 1487, 1500, 1516, 1532, 1543, 1558, 1574, 1588, 1604, 1618, 1635, 1655, 1668, 1684, 1698, 1715, 1732, 1749, 1764, 1778, 1792, 1803, 1815, 1828, 1845, 1858, 1869, 1882, 1894, 1903}
 
 func (i ErrorCode) String() string {
 	i -= 1