Bump viper version, fix nobrowser (#1991)

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