type val bool

// exprToken describes a single token in the input.
// Prefix operators define a prefix func that parses the
// upcoming value. Binary operators define an infix func
// that combines two values according to the operator.
// In that case, the parsing loop parses the two values.
type exprToken struct {
	tok    string
	prec   int
	prefix func(*exprParser) val
	infix  func(val, val) val
}

The new [ParseOID] function parses a dot-encoded ASN.1 Object Identifier string.
The [OID] type now implements the [encoding.BinaryMarshaler],

		// function being tested
		fmt.Fprintf(w, "//go:noinline\n")
		fmt.Fprintf(w, "func zero%d_ssa(x *[%d]byte) {\n", s, s)
		fmt.Fprintf(w, "  *x = [%d]byte{}\n", s)
		fmt.Fprintf(w, "}\n")

		// testing harness
		fmt.Fprintf(w, "func testZero%d(t *testing.T) {\n", s)
		fmt.Fprintf(w, "  a := Z%d{[8]byte{255,255,255,255,255,255,255,255},[%d]byte{", s, s)
		for i := 0; i < s; i++ {
			fmt.Fprintf(w, "255,")
		}

The new [ParseCookie] function parses a Cookie header value and
returns all the cookies which were set in it. Since the same cookie
name can appear multiple times the returned Values can contain
more than one value for a given key.

The new [ParseSetCookie] function parses a Set-Cookie header value and

		if langWant.major > defVers.major || (langWant.major == defVers.major && langWant.minor > defVers.minor) {
			log.Fatalf("invalid value %q for -lang: max known version is %q", base.Flag.Lang, def)
		}
	}
}

// parseLang parses a -lang option into a langVer.
func parseLang(s string) (lang, error) {
	if s == "go1" { // cmd/go's new spelling of "go1.0" (#65528)
		s = "go1.0"
	}

	matches := goVersionRE.FindStringSubmatch(s)

// authHandler serves requests only if the Basic Auth data sent with the request
// matches the contents of a ".access" file in the requested directory.
//
// For each request, the handler looks for a file named ".access" and parses it
// as a JSON-serialized accessToken. If the credentials from the request match
// the accessToken, the file is served normally; otherwise, it is rejected with
// the StatusCode and Message provided by the token.

! grep 'mod.example/sub/sub.go:' $WORK/covdata2/out.txt
grep 'rsc.io' $WORK/covdata2/out.txt
! grep 'bufio/bufio.go:' $WORK/covdata2/out.txt

#-------------------------------------------
# end of test cmds, start of harness and related files.

-- go.mod --
module mod.example

go 1.20

require rsc.io/quote/v3 v3.0.0

-- main/main.go --
package main

import (
	"fmt"
	"mod.example/sub"

	"rsc.io/quote"

}

// SocketControlMessage represents a socket control message.
type SocketControlMessage struct {
	Header Cmsghdr
	Data   []byte
}

// ParseSocketControlMessage parses b as an array of socket control
// messages.
func ParseSocketControlMessage(b []byte) ([]SocketControlMessage, error) {
	var msgs []SocketControlMessage
	i := 0
	for i+CmsgLen(0) <= len(b) {

	return []byte(fmt.Sprintf("go.sum database tree\n%d\n%s\n", tree.N, tree.Hash))
}

var errMalformedTree = errors.New("malformed tree note")
var treePrefix = []byte("go.sum database tree\n")

// ParseTree parses a formatted tree root description.
func ParseTree(text []byte) (tree Tree, err error) {
	// The message looks like:
	//
	//	go.sum database tree
	//	2
	//	nND/nri/U0xuHUrYSy0HtMeal2vzD9V4k/BO79C+QeI=
	//

// in a public API. See also #11844 for context.

package main

import (
	"bytes"
	"go/ast"
	"go/parser"
	"go/printer"
	"go/token"
	"strings"
)

// parse parses src, which was read from the named file,
// as a Go source file, declaration, or statement list.
func parse(fset *token.FileSet, filename string, src []byte, fragmentOk bool) (
	file *ast.File,