What version of Go are you using (go version)?

$ go version
go version go1.14.6 darwin/amd64

Does this issue reproduce with the latest release?

package main
import "context"
import "net"
func GoogleDNSDialer(ctx context.Context, network, address string) (net.Conn, error) {
   d := net.Dialer{}
   return d.DialContext(ctx, "udp", "8.8.8.8:53")
}
var local_resolver net.Resolver = net.Resolver{
   Dial: GoogleDNSDialer,
}
func LocalLookupIP(name string) ([]net.IP, error) {
   return local_resolver.LookupIP(context.Background(), "ip", name)
}

go build

What operating system and processor architecture are you using (go env)?

$ go env
GO111MODULE=""

GOARCH="amd64"

GOBIN=""

GOCACHE="/Users/thierryfournier/Library/Caches/go-build"

GOENV="/Users/thierryfournier/Library/Application Support/go/env"

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="darwin"

GOINSECURE=""

GONOPROXY=""

GONOSUMDB=""

GOOS="darwin"

GOPATH="/Users/thierryfournier/go"

GOPRIVATE=""

GOPROXY="https://proxy.golang.org,direct"

GOROOT="/usr/local/go"

GOSUMDB="sum.golang.org"

GOTMPDIR=""

GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"

GCCGO="gccgo"

AR="ar"

CC="clang"

CXX="clang++"

CGO_ENABLED="1"

GOMOD=""

CGO_CFLAGS="-g -O2"

CGO_CPPFLAGS=""

CGO_CXXFLAGS="-g -O2"

CGO_FFLAGS="-g -O2"

CGO_LDFLAGS="-g -O2"

PKG_CONFIG="pkg-config"

GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/_d/zs7l5ldx1r94fn_qh1zvn1rw0000gn/T/go-build235743352=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Compilation error is:

./a.go:12:25: local_resolver.LookupIP undefined (type net.Resolver has no field or method LookupIP)

But the documentation says that the function "func (*Resolver) LookupIP" exists:
https://godoc.org/net#Resolver.LookupIP

I check the file "/usr/local/go/src/net/lookup.go" and the function doesn't exists

What did you expect to see?

My build works (or fix the documentation).

What did you see instead?