io/fs: move FileInfo, FileMode, PathError, ErrInvalid, ... from os to io/fs

First step of creating the new io/fs package.

For #41190.

Change-Id: I1339b1abdd533b0f1deab283628088b2f706fb5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/243906
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

2 files changed, 221 insertions, 95 deletions

diff --git a/api/except.txt b/api/except.txt
index 962bb14271..6f6f839ba6 100644
--- a/api/except.txt
+++ b/api/except.txt
@@ -2,12 +2,56 @@ pkg encoding/json, method (*RawMessage) MarshalJSON() ([]uint8, error)
 pkg math/big, const MaxBase = 36
 pkg math/big, type Word uintptr
 pkg net, func ListenUnixgram(string, *UnixAddr) (*UDPConn, error)
-pkg os, const ModeType = 2399141888
-pkg os, const ModeType = 2399666176
-pkg os (linux-arm), const O_SYNC = 4096
-pkg os (linux-arm-cgo), const O_SYNC = 4096
 pkg os (linux-arm), const O_SYNC = 1052672
+pkg os (linux-arm), const O_SYNC = 4096
 pkg os (linux-arm-cgo), const O_SYNC = 1052672
+pkg os (linux-arm-cgo), const O_SYNC = 4096
+pkg os, const ModeAppend FileMode
+pkg os, const ModeCharDevice FileMode
+pkg os, const ModeDevice FileMode
+pkg os, const ModeDir FileMode
+pkg os, const ModeExclusive FileMode
+pkg os, const ModeIrregular FileMode
+pkg os, const ModeNamedPipe FileMode
+pkg os, const ModePerm FileMode
+pkg os, const ModeSetgid FileMode
+pkg os, const ModeSetuid FileMode
+pkg os, const ModeSocket FileMode
+pkg os, const ModeSticky FileMode
+pkg os, const ModeSymlink FileMode
+pkg os, const ModeTemporary FileMode
+pkg os, const ModeType = 2399141888
+pkg os, const ModeType = 2399666176
+pkg os, const ModeType FileMode
+pkg os, func Chmod(string, FileMode) error
+pkg os, func Lstat(string) (FileInfo, error)
+pkg os, func Mkdir(string, FileMode) error
+pkg os, func MkdirAll(string, FileMode) error
+pkg os, func OpenFile(string, int, FileMode) (*File, error)
+pkg os, func SameFile(FileInfo, FileInfo) bool
+pkg os, func Stat(string) (FileInfo, error)
+pkg os, method (*File) Chmod(FileMode) error
+pkg os, method (*File) Readdir(int) ([]FileInfo, error)
+pkg os, method (*File) Stat() (FileInfo, error)
+pkg os, method (*PathError) Error() string
+pkg os, method (*PathError) Timeout() bool
+pkg os, method (*PathError) Unwrap() error
+pkg os, method (FileMode) IsDir() bool
+pkg os, method (FileMode) IsRegular() bool
+pkg os, method (FileMode) Perm() FileMode
+pkg os, method (FileMode) String() string
+pkg os, type FileInfo interface { IsDir, ModTime, Mode, Name, Size, Sys }
+pkg os, type FileInfo interface, IsDir() bool
+pkg os, type FileInfo interface, ModTime() time.Time
+pkg os, type FileInfo interface, Mode() FileMode
+pkg os, type FileInfo interface, Name() string
+pkg os, type FileInfo interface, Size() int64
+pkg os, type FileInfo interface, Sys() interface{}
+pkg os, type FileMode uint32
+pkg os, type PathError struct
+pkg os, type PathError struct, Err error
+pkg os, type PathError struct, Op string
+pkg os, type PathError struct, Path string
 pkg syscall (darwin-amd64), const ImplementsGetwd = false
 pkg syscall (darwin-amd64), func Fchflags(string, int) error
 pkg syscall (darwin-amd64-cgo), const ImplementsGetwd = false
@@ -18,22 +62,72 @@ pkg syscall (freebsd-386), const ELAST = 94
 pkg syscall (freebsd-386), const ImplementsGetwd = false
 pkg syscall (freebsd-386), const O_CLOEXEC = 0
 pkg syscall (freebsd-386), func Fchflags(string, int) error
+pkg syscall (freebsd-386), func Mknod(string, uint32, int) error
+pkg syscall (freebsd-386), type Dirent struct, Fileno uint32
+pkg syscall (freebsd-386), type Dirent struct, Namlen uint8
+pkg syscall (freebsd-386), type Stat_t struct, Blksize uint32
+pkg syscall (freebsd-386), type Stat_t struct, Dev uint32
+pkg syscall (freebsd-386), type Stat_t struct, Gen uint32
+pkg syscall (freebsd-386), type Stat_t struct, Ino uint32
+pkg syscall (freebsd-386), type Stat_t struct, Lspare int32
+pkg syscall (freebsd-386), type Stat_t struct, Nlink uint16
+pkg syscall (freebsd-386), type Stat_t struct, Pad_cgo_0 [8]uint8
+pkg syscall (freebsd-386), type Stat_t struct, Rdev uint32
+pkg syscall (freebsd-386), type Statfs_t struct, Mntfromname [88]int8
+pkg syscall (freebsd-386), type Statfs_t struct, Mntonname [88]int8
 pkg syscall (freebsd-386-cgo), const AF_MAX = 38
 pkg syscall (freebsd-386-cgo), const DLT_MATCHING_MAX = 242
 pkg syscall (freebsd-386-cgo), const ELAST = 94
 pkg syscall (freebsd-386-cgo), const ImplementsGetwd = false
 pkg syscall (freebsd-386-cgo), const O_CLOEXEC = 0
+pkg syscall (freebsd-386-cgo), func Mknod(string, uint32, int) error
+pkg syscall (freebsd-386-cgo), type Dirent struct, Fileno uint32
+pkg syscall (freebsd-386-cgo), type Dirent struct, Namlen uint8
+pkg syscall (freebsd-386-cgo), type Stat_t struct, Blksize uint32
+pkg syscall (freebsd-386-cgo), type Stat_t struct, Dev uint32
+pkg syscall (freebsd-386-cgo), type Stat_t struct, Gen uint32
+pkg syscall (freebsd-386-cgo), type Stat_t struct, Ino uint32
+pkg syscall (freebsd-386-cgo), type Stat_t struct, Lspare int32
+pkg syscall (freebsd-386-cgo), type Stat_t struct, Nlink uint16
+pkg syscall (freebsd-386-cgo), type Stat_t struct, Pad_cgo_0 [8]uint8
+pkg syscall (freebsd-386-cgo), type Stat_t struct, Rdev uint32
+pkg syscall (freebsd-386-cgo), type Statfs_t struct, Mntfromname [88]int8
+pkg syscall (freebsd-386-cgo), type Statfs_t struct, Mntonname [88]int8
 pkg syscall (freebsd-amd64), const AF_MAX = 38
 pkg syscall (freebsd-amd64), const DLT_MATCHING_MAX = 242
 pkg syscall (freebsd-amd64), const ELAST = 94
 pkg syscall (freebsd-amd64), const ImplementsGetwd = false
 pkg syscall (freebsd-amd64), const O_CLOEXEC = 0
 pkg syscall (freebsd-amd64), func Fchflags(string, int) error
+pkg syscall (freebsd-amd64), func Mknod(string, uint32, int) error
+pkg syscall (freebsd-amd64), type Dirent struct, Fileno uint32
+pkg syscall (freebsd-amd64), type Dirent struct, Namlen uint8
+pkg syscall (freebsd-amd64), type Stat_t struct, Blksize uint32
+pkg syscall (freebsd-amd64), type Stat_t struct, Dev uint32
+pkg syscall (freebsd-amd64), type Stat_t struct, Gen uint32
+pkg syscall (freebsd-amd64), type Stat_t struct, Ino uint32
+pkg syscall (freebsd-amd64), type Stat_t struct, Lspare int32
+pkg syscall (freebsd-amd64), type Stat_t struct, Nlink uint16
+pkg syscall (freebsd-amd64), type Stat_t struct, Rdev uint32
+pkg syscall (freebsd-amd64), type Statfs_t struct, Mntfromname [88]int8
+pkg syscall (freebsd-amd64), type Statfs_t struct, Mntonname [88]int8
 pkg syscall (freebsd-amd64-cgo), const AF_MAX = 38
 pkg syscall (freebsd-amd64-cgo), const DLT_MATCHING_MAX = 242
 pkg syscall (freebsd-amd64-cgo), const ELAST = 94
 pkg syscall (freebsd-amd64-cgo), const ImplementsGetwd = false
 pkg syscall (freebsd-amd64-cgo), const O_CLOEXEC = 0
+pkg syscall (freebsd-amd64-cgo), func Mknod(string, uint32, int) error
+pkg syscall (freebsd-amd64-cgo), type Dirent struct, Fileno uint32
+pkg syscall (freebsd-amd64-cgo), type Dirent struct, Namlen uint8
+pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Blksize uint32
+pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Dev uint32
+pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Gen uint32
+pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Ino uint32
+pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Lspare int32
+pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Nlink uint16
+pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Rdev uint32
+pkg syscall (freebsd-amd64-cgo), type Statfs_t struct, Mntfromname [88]int8
+pkg syscall (freebsd-amd64-cgo), type Statfs_t struct, Mntonname [88]int8
 pkg syscall (freebsd-arm), const AF_MAX = 38
 pkg syscall (freebsd-arm), const BIOCGRTIMEOUT = 1074545262
 pkg syscall (freebsd-arm), const BIOCSRTIMEOUT = 2148287085
@@ -62,10 +156,22 @@ pkg syscall (freebsd-arm), const SizeofSockaddrDatalink = 56
 pkg syscall (freebsd-arm), const SizeofSockaddrUnix = 108
 pkg syscall (freebsd-arm), const TIOCTIMESTAMP = 1074558041
 pkg syscall (freebsd-arm), func Fchflags(string, int) error
+pkg syscall (freebsd-arm), func Mknod(string, uint32, int) error
 pkg syscall (freebsd-arm), type BpfHdr struct, Pad_cgo_0 [2]uint8
+pkg syscall (freebsd-arm), type Dirent struct, Fileno uint32
+pkg syscall (freebsd-arm), type Dirent struct, Namlen uint8
 pkg syscall (freebsd-arm), type RawSockaddrDatalink struct, Pad_cgo_0 [2]uint8
 pkg syscall (freebsd-arm), type RawSockaddrUnix struct, Pad_cgo_0 [2]uint8
+pkg syscall (freebsd-arm), type Stat_t struct, Blksize uint32
+pkg syscall (freebsd-arm), type Stat_t struct, Dev uint32
+pkg syscall (freebsd-arm), type Stat_t struct, Gen uint32
+pkg syscall (freebsd-arm), type Stat_t struct, Ino uint32
+pkg syscall (freebsd-arm), type Stat_t struct, Lspare int32
+pkg syscall (freebsd-arm), type Stat_t struct, Nlink uint16
 pkg syscall (freebsd-arm), type Stat_t struct, Pad_cgo_0 [4]uint8
+pkg syscall (freebsd-arm), type Stat_t struct, Rdev uint32
+pkg syscall (freebsd-arm), type Statfs_t struct, Mntfromname [88]int8
+pkg syscall (freebsd-arm), type Statfs_t struct, Mntonname [88]int8
 pkg syscall (freebsd-arm-cgo), const AF_MAX = 38
 pkg syscall (freebsd-arm-cgo), const BIOCGRTIMEOUT = 1074545262
 pkg syscall (freebsd-arm-cgo), const BIOCSRTIMEOUT = 2148287085
@@ -94,10 +200,22 @@ pkg syscall (freebsd-arm-cgo), const SizeofSockaddrDatalink = 56
 pkg syscall (freebsd-arm-cgo), const SizeofSockaddrUnix = 108
 pkg syscall (freebsd-arm-cgo), const TIOCTIMESTAMP = 1074558041
 pkg syscall (freebsd-arm-cgo), func Fchflags(string, int) error
+pkg syscall (freebsd-arm-cgo), func Mknod(string, uint32, int) error
 pkg syscall (freebsd-arm-cgo), type BpfHdr struct, Pad_cgo_0 [2]uint8
+pkg syscall (freebsd-arm-cgo), type Dirent struct, Fileno uint32
+pkg syscall (freebsd-arm-cgo), type Dirent struct, Namlen uint8
 pkg syscall (freebsd-arm-cgo), type RawSockaddrDatalink struct, Pad_cgo_0 [2]uint8
 pkg syscall (freebsd-arm-cgo), type RawSockaddrUnix struct, Pad_cgo_0 [2]uint8
+pkg syscall (freebsd-arm-cgo), type Stat_t struct, Blksize uint32
+pkg syscall (freebsd-arm-cgo), type Stat_t struct, Dev uint32
+pkg syscall (freebsd-arm-cgo), type Stat_t struct, Gen uint32
+pkg syscall (freebsd-arm-cgo), type Stat_t struct, Ino uint32
+pkg syscall (freebsd-arm-cgo), type Stat_t struct, Lspare int32
+pkg syscall (freebsd-arm-cgo), type Stat_t struct, Nlink uint16
 pkg syscall (freebsd-arm-cgo), type Stat_t struct, Pad_cgo_0 [4]uint8
+pkg syscall (freebsd-arm-cgo), type Stat_t struct, Rdev uint32
+pkg syscall (freebsd-arm-cgo), type Statfs_t struct, Mntfromname [88]int8
+pkg syscall (freebsd-arm-cgo), type Statfs_t struct, Mntonname [88]int8
 pkg syscall (linux-386), type Cmsghdr struct, X__cmsg_data [0]uint8
 pkg syscall (linux-386-cgo), type Cmsghdr struct, X__cmsg_data [0]uint8
 pkg syscall (linux-amd64), type Cmsghdr struct, X__cmsg_data [0]uint8
@@ -109,10 +227,10 @@ pkg syscall (netbsd-386-cgo), const ImplementsGetwd = false
 pkg syscall (netbsd-amd64), const ImplementsGetwd = false
 pkg syscall (netbsd-amd64-cgo), const ImplementsGetwd = false
 pkg syscall (netbsd-arm), const ImplementsGetwd = false
-pkg syscall (netbsd-arm-cgo), const ImplementsGetwd = false
 pkg syscall (netbsd-arm), const SizeofIfData = 132
 pkg syscall (netbsd-arm), func Fchflags(string, int) error
 pkg syscall (netbsd-arm), type IfMsghdr struct, Pad_cgo_1 [4]uint8
+pkg syscall (netbsd-arm-cgo), const ImplementsGetwd = false
 pkg syscall (netbsd-arm-cgo), const SizeofIfData = 132
 pkg syscall (netbsd-arm-cgo), func Fchflags(string, int) error
 pkg syscall (netbsd-arm-cgo), type IfMsghdr struct, Pad_cgo_1 [4]uint8
@@ -140,6 +258,7 @@ pkg syscall (openbsd-386), const SYS_GETITIMER = 86
 pkg syscall (openbsd-386), const SYS_GETRUSAGE = 117
 pkg syscall (openbsd-386), const SYS_GETTIMEOFDAY = 116
 pkg syscall (openbsd-386), const SYS_KEVENT = 270
+pkg syscall (openbsd-386), const SYS_KILL = 37
 pkg syscall (openbsd-386), const SYS_LSTAT = 293
 pkg syscall (openbsd-386), const SYS_NANOSLEEP = 240
 pkg syscall (openbsd-386), const SYS_SELECT = 93
@@ -193,6 +312,7 @@ pkg syscall (openbsd-386-cgo), const SYS_GETITIMER = 86
 pkg syscall (openbsd-386-cgo), const SYS_GETRUSAGE = 117
 pkg syscall (openbsd-386-cgo), const SYS_GETTIMEOFDAY = 116
 pkg syscall (openbsd-386-cgo), const SYS_KEVENT = 270
+pkg syscall (openbsd-386-cgo), const SYS_KILL = 37
 pkg syscall (openbsd-386-cgo), const SYS_LSTAT = 293
 pkg syscall (openbsd-386-cgo), const SYS_NANOSLEEP = 240
 pkg syscall (openbsd-386-cgo), const SYS_SELECT = 93
@@ -257,6 +377,7 @@ pkg syscall (openbsd-amd64), const SYS_GETITIMER = 86
 pkg syscall (openbsd-amd64), const SYS_GETRUSAGE = 117
 pkg syscall (openbsd-amd64), const SYS_GETTIMEOFDAY = 116
 pkg syscall (openbsd-amd64), const SYS_KEVENT = 270
+pkg syscall (openbsd-amd64), const SYS_KILL = 37
 pkg syscall (openbsd-amd64), const SYS_LSTAT = 293
 pkg syscall (openbsd-amd64), const SYS_NANOSLEEP = 240
 pkg syscall (openbsd-amd64), const SYS_SELECT = 93
@@ -320,6 +441,7 @@ pkg syscall (openbsd-amd64-cgo), const SYS_GETITIMER = 86
 pkg syscall (openbsd-amd64-cgo), const SYS_GETRUSAGE = 117
 pkg syscall (openbsd-amd64-cgo), const SYS_GETTIMEOFDAY = 116
 pkg syscall (openbsd-amd64-cgo), const SYS_KEVENT = 270
+pkg syscall (openbsd-amd64-cgo), const SYS_KILL = 37
 pkg syscall (openbsd-amd64-cgo), const SYS_LSTAT = 293
 pkg syscall (openbsd-amd64-cgo), const SYS_NANOSLEEP = 240
 pkg syscall (openbsd-amd64-cgo), const SYS_SELECT = 93
@@ -348,19 +470,6 @@ pkg syscall (openbsd-amd64-cgo), type Statfs_t struct, F_spare [3]uint32
 pkg syscall (openbsd-amd64-cgo), type Statfs_t struct, Pad_cgo_1 [4]uint8
 pkg syscall (openbsd-amd64-cgo), type Timespec struct, Pad_cgo_0 [4]uint8
 pkg syscall (openbsd-amd64-cgo), type Timespec struct, Sec int32
-pkg testing, func RegisterCover(Cover)
-pkg testing, func MainStart(func(string, string) (bool, error), []InternalTest, []InternalBenchmark, []InternalExample) *M
-pkg text/template/parse, type DotNode bool
-pkg text/template/parse, type Node interface { Copy, String, Type }
-pkg unicode, const Version = "6.2.0"
-pkg unicode, const Version = "6.3.0"
-pkg unicode, const Version = "7.0.0"
-pkg unicode, const Version = "8.0.0"
-pkg syscall (openbsd-386), const SYS_KILL = 37
-pkg syscall (openbsd-386-cgo), const SYS_KILL = 37
-pkg syscall (openbsd-amd64), const SYS_KILL = 37
-pkg syscall (openbsd-amd64-cgo), const SYS_KILL = 37
-pkg unicode, const Version = "9.0.0"
 pkg syscall (windows-386), const TOKEN_ALL_ACCESS = 983295
 pkg syscall (windows-386), type AddrinfoW struct, Addr uintptr
 pkg syscall (windows-386), type CertChainPolicyPara struct, ExtraPolicyPara uintptr
@@ -379,81 +488,16 @@ pkg syscall (windows-amd64), type CertRevocationInfo struct, CrlInfo uintptr
 pkg syscall (windows-amd64), type CertRevocationInfo struct, OidSpecificInfo uintptr
 pkg syscall (windows-amd64), type CertSimpleChain struct, TrustListInfo uintptr
 pkg syscall (windows-amd64), type RawSockaddrAny struct, Pad [96]int8
-pkg syscall (freebsd-386), func Mknod(string, uint32, int) error
-pkg syscall (freebsd-386), type Dirent struct, Fileno uint32
-pkg syscall (freebsd-386), type Dirent struct, Namlen uint8
-pkg syscall (freebsd-386), type Stat_t struct, Blksize uint32
-pkg syscall (freebsd-386), type Stat_t struct, Dev uint32
-pkg syscall (freebsd-386), type Stat_t struct, Gen uint32
-pkg syscall (freebsd-386), type Stat_t struct, Ino uint32
-pkg syscall (freebsd-386), type Stat_t struct, Lspare int32
-pkg syscall (freebsd-386), type Stat_t struct, Nlink uint16
-pkg syscall (freebsd-386), type Stat_t struct, Pad_cgo_0 [8]uint8
-pkg syscall (freebsd-386), type Stat_t struct, Rdev uint32
-pkg syscall (freebsd-386), type Statfs_t struct, Mntfromname [88]int8
-pkg syscall (freebsd-386), type Statfs_t struct, Mntonname [88]int8
-pkg syscall (freebsd-386-cgo), func Mknod(string, uint32, int) error
-pkg syscall (freebsd-386-cgo), type Dirent struct, Fileno uint32
-pkg syscall (freebsd-386-cgo), type Dirent struct, Namlen uint8
-pkg syscall (freebsd-386-cgo), type Stat_t struct, Blksize uint32
-pkg syscall (freebsd-386-cgo), type Stat_t struct, Dev uint32
-pkg syscall (freebsd-386-cgo), type Stat_t struct, Gen uint32
-pkg syscall (freebsd-386-cgo), type Stat_t struct, Ino uint32
-pkg syscall (freebsd-386-cgo), type Stat_t struct, Lspare int32
-pkg syscall (freebsd-386-cgo), type Stat_t struct, Nlink uint16
-pkg syscall (freebsd-386-cgo), type Stat_t struct, Pad_cgo_0 [8]uint8
-pkg syscall (freebsd-386-cgo), type Stat_t struct, Rdev uint32
-pkg syscall (freebsd-386-cgo), type Statfs_t struct, Mntfromname [88]int8
-pkg syscall (freebsd-386-cgo), type Statfs_t struct, Mntonname [88]int8
-pkg syscall (freebsd-amd64), func Mknod(string, uint32, int) error
-pkg syscall (freebsd-amd64), type Dirent struct, Fileno uint32
-pkg syscall (freebsd-amd64), type Dirent struct, Namlen uint8
-pkg syscall (freebsd-amd64), type Stat_t struct, Blksize uint32
-pkg syscall (freebsd-amd64), type Stat_t struct, Dev uint32
-pkg syscall (freebsd-amd64), type Stat_t struct, Gen uint32
-pkg syscall (freebsd-amd64), type Stat_t struct, Ino uint32
-pkg syscall (freebsd-amd64), type Stat_t struct, Lspare int32
-pkg syscall (freebsd-amd64), type Stat_t struct, Nlink uint16
-pkg syscall (freebsd-amd64), type Stat_t struct, Rdev uint32
-pkg syscall (freebsd-amd64), type Statfs_t struct, Mntfromname [88]int8
-pkg syscall (freebsd-amd64), type Statfs_t struct, Mntonname [88]int8
-pkg syscall (freebsd-amd64-cgo), func Mknod(string, uint32, int) error
-pkg syscall (freebsd-amd64-cgo), type Dirent struct, Fileno uint32
-pkg syscall (freebsd-amd64-cgo), type Dirent struct, Namlen uint8
-pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Blksize uint32
-pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Dev uint32
-pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Gen uint32
-pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Ino uint32
-pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Lspare int32
-pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Nlink uint16
-pkg syscall (freebsd-amd64-cgo), type Stat_t struct, Rdev uint32
-pkg syscall (freebsd-amd64-cgo), type Statfs_t struct, Mntfromname [88]int8
-pkg syscall (freebsd-amd64-cgo), type Statfs_t struct, Mntonname [88]int8
-pkg syscall (freebsd-arm), func Mknod(string, uint32, int) error
-pkg syscall (freebsd-arm), type Dirent struct, Fileno uint32
-pkg syscall (freebsd-arm), type Dirent struct, Namlen uint8
-pkg syscall (freebsd-arm), type Stat_t struct, Blksize uint32
-pkg syscall (freebsd-arm), type Stat_t struct, Dev uint32
-pkg syscall (freebsd-arm), type Stat_t struct, Gen uint32
-pkg syscall (freebsd-arm), type Stat_t struct, Ino uint32
-pkg syscall (freebsd-arm), type Stat_t struct, Lspare int32
-pkg syscall (freebsd-arm), type Stat_t struct, Nlink uint16
-pkg syscall (freebsd-arm), type Stat_t struct, Rdev uint32
-pkg syscall (freebsd-arm), type Statfs_t struct, Mntfromname [88]int8
-pkg syscall (freebsd-arm), type Statfs_t struct, Mntonname [88]int8
-pkg syscall (freebsd-arm-cgo), func Mknod(string, uint32, int) error
-pkg syscall (freebsd-arm-cgo), type Dirent struct, Fileno uint32
-pkg syscall (freebsd-arm-cgo), type Dirent struct, Namlen uint8
-pkg syscall (freebsd-arm-cgo), type Stat_t struct, Blksize uint32
-pkg syscall (freebsd-arm-cgo), type Stat_t struct, Dev uint32
-pkg syscall (freebsd-arm-cgo), type Stat_t struct, Gen uint32
-pkg syscall (freebsd-arm-cgo), type Stat_t struct, Ino uint32
-pkg syscall (freebsd-arm-cgo), type Stat_t struct, Lspare int32
-pkg syscall (freebsd-arm-cgo), type Stat_t struct, Nlink uint16
-pkg syscall (freebsd-arm-cgo), type Stat_t struct, Rdev uint32
-pkg syscall (freebsd-arm-cgo), type Statfs_t struct, Mntfromname [88]int8
-pkg syscall (freebsd-arm-cgo), type Statfs_t struct, Mntonname [88]int8
+pkg testing, func MainStart(func(string, string) (bool, error), []InternalTest, []InternalBenchmark, []InternalExample) *M
+pkg testing, func RegisterCover(Cover)
 pkg text/scanner, const GoTokens = 1012
+pkg text/template/parse, type DotNode bool
+pkg text/template/parse, type Node interface { Copy, String, Type }
 pkg unicode, const Version = "10.0.0"
 pkg unicode, const Version = "11.0.0"
 pkg unicode, const Version = "12.0.0"
+pkg unicode, const Version = "6.2.0"
+pkg unicode, const Version = "6.3.0"
+pkg unicode, const Version = "7.0.0"
+pkg unicode, const Version = "8.0.0"
+pkg unicode, const Version = "9.0.0"
diff --git a/api/next.txt b/api/next.txt
index 59422cca4d..3184a8ceae 100644
--- a/api/next.txt
+++ b/api/next.txt
@@ -223,15 +223,97 @@ pkg io, type ReadSeekCloser interface { Close, Read, Seek }
 pkg io, type ReadSeekCloser interface, Close() error
 pkg io, type ReadSeekCloser interface, Read([]uint8) (int, error)
 pkg io, type ReadSeekCloser interface, Seek(int64, int) (int64, error)
+pkg io/fs, const ModeAppend = 1073741824
+pkg io/fs, const ModeAppend FileMode
+pkg io/fs, const ModeCharDevice = 2097152
+pkg io/fs, const ModeCharDevice FileMode
+pkg io/fs, const ModeDevice = 67108864
+pkg io/fs, const ModeDevice FileMode
+pkg io/fs, const ModeDir = 2147483648
+pkg io/fs, const ModeDir FileMode
+pkg io/fs, const ModeExclusive = 536870912
+pkg io/fs, const ModeExclusive FileMode
+pkg io/fs, const ModeIrregular = 524288
+pkg io/fs, const ModeIrregular FileMode
+pkg io/fs, const ModeNamedPipe = 33554432
+pkg io/fs, const ModeNamedPipe FileMode
+pkg io/fs, const ModePerm = 511
+pkg io/fs, const ModePerm FileMode
+pkg io/fs, const ModeSetgid = 4194304
+pkg io/fs, const ModeSetgid FileMode
+pkg io/fs, const ModeSetuid = 8388608
+pkg io/fs, const ModeSetuid FileMode
+pkg io/fs, const ModeSocket = 16777216
+pkg io/fs, const ModeSocket FileMode
+pkg io/fs, const ModeSticky = 1048576
+pkg io/fs, const ModeSticky FileMode
+pkg io/fs, const ModeSymlink = 134217728
+pkg io/fs, const ModeSymlink FileMode
+pkg io/fs, const ModeTemporary = 268435456
+pkg io/fs, const ModeTemporary FileMode
+pkg io/fs, const ModeType = 2401763328
+pkg io/fs, const ModeType FileMode
+pkg io/fs, method (*PathError) Error() string
+pkg io/fs, method (*PathError) Timeout() bool
+pkg io/fs, method (*PathError) Unwrap() error
+pkg io/fs, method (FileMode) IsDir() bool
+pkg io/fs, method (FileMode) IsRegular() bool
+pkg io/fs, method (FileMode) Perm() FileMode
+pkg io/fs, method (FileMode) String() string
+pkg io/fs, method (FileMode) Type() FileMode
+pkg io/fs, type FileInfo interface { IsDir, ModTime, Mode, Name, Size, Sys }
+pkg io/fs, type FileInfo interface, IsDir() bool
+pkg io/fs, type FileInfo interface, ModTime() time.Time
+pkg io/fs, type FileInfo interface, Mode() FileMode
+pkg io/fs, type FileInfo interface, Name() string
+pkg io/fs, type FileInfo interface, Size() int64
+pkg io/fs, type FileInfo interface, Sys() interface{}
+pkg io/fs, type FileMode uint32
+pkg io/fs, type PathError struct
+pkg io/fs, type PathError struct, Err error
+pkg io/fs, type PathError struct, Op string
+pkg io/fs, type PathError struct, Path string
+pkg io/fs, var ErrClosed error
+pkg io/fs, var ErrExist error
+pkg io/fs, var ErrInvalid error
+pkg io/fs, var ErrNotExist error
+pkg io/fs, var ErrPermission error
 pkg net, var ErrClosed error
 pkg net/http, type Transport struct, GetProxyConnectHeader func(context.Context, *url.URL, string) (Header, error)
+pkg os, const ModeAppend fs.FileMode
+pkg os, const ModeCharDevice fs.FileMode
+pkg os, const ModeDevice fs.FileMode
+pkg os, const ModeDir fs.FileMode
+pkg os, const ModeExclusive fs.FileMode
+pkg os, const ModeIrregular fs.FileMode
+pkg os, const ModeNamedPipe fs.FileMode
+pkg os, const ModePerm fs.FileMode
+pkg os, const ModeSetgid fs.FileMode
+pkg os, const ModeSetuid fs.FileMode
+pkg os, const ModeSocket fs.FileMode
+pkg os, const ModeSticky fs.FileMode
+pkg os, const ModeSymlink fs.FileMode
+pkg os, const ModeTemporary fs.FileMode
+pkg os, const ModeType fs.FileMode
+pkg os, func Chmod(string, fs.FileMode) error
+pkg os, func Lstat(string) (fs.FileInfo, error)
+pkg os, func Mkdir(string, fs.FileMode) error
+pkg os, func MkdirAll(string, fs.FileMode) error
+pkg os, func OpenFile(string, int, fs.FileMode) (*File, error)
+pkg os, func SameFile(fs.FileInfo, fs.FileInfo) bool
+pkg os, func Stat(string) (fs.FileInfo, error)
+pkg os, method (*File) Chmod(fs.FileMode) error
 pkg os, method (*File) ReadDir(int) ([]DirEntry, error)
-pkg os, method (FileMode) Type() FileMode
+pkg os, method (*File) Readdir(int) ([]fs.FileInfo, error)
+pkg os, method (*File) Stat() (fs.FileInfo, error)
 pkg os, type DirEntry interface { Info, IsDir, Name, Type }
-pkg os, type DirEntry interface, Info() (FileInfo, error)
+pkg os, type DirEntry interface, Info() (fs.FileInfo, error)
 pkg os, type DirEntry interface, IsDir() bool
 pkg os, type DirEntry interface, Name() string
-pkg os, type DirEntry interface, Type() FileMode
+pkg os, type DirEntry interface, Type() fs.FileMode
+pkg os, type FileInfo = fs.FileInfo
+pkg os, type FileMode = fs.FileMode
+pkg os, type PathError = fs.PathError
 pkg os/signal, func NotifyContext(context.Context, ...os.Signal) (context.Context, context.CancelFunc)
 pkg testing/iotest, func ErrReader(error) io.Reader
 pkg text/template/parse, const NodeComment = 20