A typical sequence might be:

    cd src  # or src/cmd
    go get golang.org/x/net@master
    go mod tidy
    go mod vendor

Use caution when passing '-u' to 'go get'. The '-u' flag updates
modules providing all transitively imported packages, not only
the module providing the target package.

Note that 'go mod vendor' only copies packages that are transitively

pkg encoding/json, method (Delim) String() string
pkg encoding/json, type Delim int32
pkg encoding/json, type Token interface {}
pkg encoding/json, type UnmarshalTypeError struct, Offset int64
pkg flag, func UnquoteUsage(*Flag) (string, string)
pkg go/ast, type EmptyStmt struct, Implicit bool
pkg go/build, type Package struct, PkgTargetRoot string
pkg go/constant, const Bool = 1
pkg go/constant, const Bool Kind

pkg flag, method (*FlagSet) Visit(func(*Flag))
pkg flag, method (*FlagSet) VisitAll(func(*Flag))
pkg flag, type ErrorHandling int
pkg flag, type Flag struct
pkg flag, type Flag struct, DefValue string
pkg flag, type Flag struct, Name string
pkg flag, type Flag struct, Usage string
pkg flag, type Flag struct, Value Value
pkg flag, type FlagSet struct
pkg flag, type FlagSet struct, Usage func()

pkg syscall (windows-386), const FILE_ATTRIBUTE_REPARSE_POINT = 1024
pkg syscall (windows-386), const FILE_ATTRIBUTE_REPARSE_POINT ideal-int
pkg syscall (windows-386), const FILE_FLAG_OPEN_REPARSE_POINT = 2097152
pkg syscall (windows-386), const FILE_FLAG_OPEN_REPARSE_POINT ideal-int
pkg syscall (windows-386), const FSCTL_GET_REPARSE_POINT = 589992
pkg syscall (windows-386), const FSCTL_GET_REPARSE_POINT ideal-int

pkg syscall (freebsd-386), type Termios struct, Cc [20]uint8
pkg syscall (freebsd-386), type Termios struct, Cflag uint32
pkg syscall (freebsd-386), type Termios struct, Iflag uint32
pkg syscall (freebsd-386), type Termios struct, Ispeed uint32
pkg syscall (freebsd-386), type Termios struct, Lflag uint32
pkg syscall (freebsd-386), type Termios struct, Oflag uint32
pkg syscall (freebsd-386), type Termios struct, Ospeed uint32

pkg syscall (netbsd-arm64-cgo), type Termios struct, Cflag uint32
pkg syscall (netbsd-arm64-cgo), type Termios struct, Iflag uint32
pkg syscall (netbsd-arm64-cgo), type Termios struct, Ispeed int32
pkg syscall (netbsd-arm64-cgo), type Termios struct, Lflag uint32
pkg syscall (netbsd-arm64-cgo), type Termios struct, Oflag uint32
pkg syscall (netbsd-arm64-cgo), type Termios struct, Ospeed int32

pkg syscall (freebsd-arm64), type Termios struct, Cflag uint32
pkg syscall (freebsd-arm64), type Termios struct, Iflag uint32
pkg syscall (freebsd-arm64), type Termios struct, Ispeed uint32
pkg syscall (freebsd-arm64), type Termios struct, Lflag uint32
pkg syscall (freebsd-arm64), type Termios struct, Oflag uint32
pkg syscall (freebsd-arm64), type Termios struct, Ospeed uint32

pkg syscall (darwin-arm64), const EV_ERROR = 16384
pkg syscall (darwin-arm64), const EV_ERROR ideal-int
pkg syscall (darwin-arm64), const EV_FLAG0 = 4096
pkg syscall (darwin-arm64), const EV_FLAG0 ideal-int
pkg syscall (darwin-arm64), const EV_FLAG1 = 8192
pkg syscall (darwin-arm64), const EV_FLAG1 ideal-int
pkg syscall (darwin-arm64), const EV_ONESHOT = 16
pkg syscall (darwin-arm64), const EV_ONESHOT ideal-int

pkg encoding/xml, type TokenReader interface { Token }
pkg encoding/xml, type TokenReader interface, Token() (Token, error)
pkg flag, method (*FlagSet) ErrorHandling() ErrorHandling
pkg flag, method (*FlagSet) Name() string
pkg flag, method (*FlagSet) Output() io.Writer
pkg html/template, type Srcset string
pkg math, func Erfcinv(float64) float64
pkg math, func Erfinv(float64) float64

pkg encoding/csv, method (*Reader) InputOffset() int64 #43401
pkg encoding/xml, method (*Decoder) InputPos() (int, int) #45628
pkg flag, func TextVar(encoding.TextUnmarshaler, string, encoding.TextMarshaler, string) #45754
pkg flag, method (*FlagSet) TextVar(encoding.TextUnmarshaler, string, encoding.TextMarshaler, string) #45754
pkg fmt, func Append([]uint8, ...interface{}) []uint8 #47579