The vendor directory may be updated with 'go mod vendor'.
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

is in a module with a `go.mod` `go` line using Go 1.23.0 or later.
When Go 1.23 builds older programs, the old behaviors remain in effect.
The new [GODEBUG setting](/doc/godebug) [`asynctimerchan=1`](/pkg/time/#NewTimer)
can be used to revert back to asynchronous channel behaviors

# Use the Go module mirror and checksum database by default.
# See https://proxy.golang.org for details.
GOPROXY=https://proxy.golang.org,direct
GOSUMDB=sum.golang.org

# Automatically download newer toolchains as directed by go.mod files.
# See https://go.dev/doc/toolchain for details.

When a GODEBUG setting is not listed in the environment variable,
its value is derived from three sources:
the defaults for the Go toolchain used to build the program,
amended to match the Go version listed in `go.mod`,
and then overridden by explicit `//go:debug` lines in the program.

The [GODEBUG History](#history) gives the exact defaults for each Go toolchain version.
For example, Go 1.21 introduces the `panicnil` setting,

by the `go` directive in the file's enclosing `go.mod` file, and
by any [`//go:build` constraints](https://pkg.go.dev/cmd/go#hdr-Build_constraints)
in the file.)

For example, it will report a diagnostic for a reference to the
`reflect.TypeFor` function (introduced in go1.22) from a file in a
module whose go.mod file specifies `go 1.21`.

pkg image, method (Point) Add(Point) Point
pkg image, method (Point) Div(int) Point
pkg image, method (Point) Eq(Point) bool
pkg image, method (Point) In(Rectangle) bool
pkg image, method (Point) Mod(Rectangle) Point
pkg image, method (Point) Mul(int) Point
pkg image, method (Point) String() string
pkg image, method (Point) Sub(Point) Point
pkg image, method (Rectangle) Add(Point) Rectangle

pkg syscall (linux-386), const EPOLL_CLOEXEC = 524288
pkg syscall (linux-386), const EPOLL_CTL_ADD = 1
pkg syscall (linux-386), const EPOLL_CTL_DEL = 2
pkg syscall (linux-386), const EPOLL_CTL_MOD = 3
pkg syscall (linux-386), const EPOLL_NONBLOCK = 2048
pkg syscall (linux-386), const EPROTO = 71
pkg syscall (linux-386), const EPROTONOSUPPORT = 93
pkg syscall (linux-386), const EPROTOTYPE = 91

pkg syscall (linux-arm-cgo), const EPOLL_CLOEXEC ideal-int
pkg syscall (linux-arm-cgo), const EPOLL_CTL_ADD ideal-int
pkg syscall (linux-arm-cgo), const EPOLL_CTL_DEL ideal-int
pkg syscall (linux-arm-cgo), const EPOLL_CTL_MOD ideal-int
pkg syscall (linux-arm-cgo), const EPOLL_NONBLOCK ideal-int
pkg syscall (linux-arm-cgo), const EPROTO Errno
pkg syscall (linux-arm-cgo), const EREMCHG Errno
pkg syscall (linux-arm-cgo), const EREMOTEIO Errno