//
// The package is sometimes only imported for the side effect of
// registering its HTTP handler and the above variables. To use it
// this way, link this package into your program:
//
//	import _ "expvar"
package expvar

import (
	"encoding/json"
	"internal/godebug"
	"log"
	"math"
	"net/http"
	"os"
	"runtime"
	"slices"
	"strconv"
	"sync"
	"sync/atomic"
	"unicode/utf8"
)

//go:generate ./mkstd.sh

package comment

var stdPkgs = []string{
	"bufio",
	"bytes",
	"cmp",
	"context",
	"crypto",
	"embed",
	"encoding",
	"errors",
	"expvar",
	"flag",
	"fmt",
	"hash",
	"html",
	"image",
	"io",
	"iter",
	"log",
	"maps",
	"math",
	"mime",
	"net",
	"os",
	"path",
	"plugin",
	"reflect",
	"regexp",
	"runtime",

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package expvar

import (
	"bytes"
	"crypto/sha1"
	"encoding/json"
	"fmt"
	"net"
	"net/http/httptest"
	"reflect"
	"runtime"
	"strconv"
	"sync"
	"sync/atomic"
	"testing"
)

// RemoveAll removes all exported variables.
// This is for tests only.

	net/http/internal,
	net/http/internal/ascii,
	net/http/internal/testcert,
	net/http/httptrace,
	mime/multipart,
	log
	< net/http;

	# HTTP-aware packages

	encoding/json, net/http
	< expvar;

	net/http, net/http/internal/ascii
	< net/http/cookiejar, net/http/httputil;

	net/http, flag
	< net/http/httptest;

	net/http, regexp
	< net/http/cgi
	< net/http/fcgi;

	# Profiling

			return n
		}
		a := ir.Copy(n).(*ir.UnaryExpr)
		a.X = l
		return walkExpr(typecheck.Expr(a), init)

	case ir.ODOT, ir.ODOTPTR:
		n := n.(*ir.SelectorExpr)
		l := safeExpr(n.X, init)
		if l == n.X {
			return n
		}
		a := ir.Copy(n).(*ir.SelectorExpr)
		a.X = l
		return walkExpr(typecheck.Expr(a), init)

	case ir.ODEREF:
		n := n.(*ir.StarExpr)
		l := safeExpr(n.X, init)
		if l == n.X {

		major        string
		minor        string
		expErr       bool
		operatorYaml string
	}{
		{
			major:        "1",
			minor:        "16",
			expErr:       false,
			operatorYaml: o1,
		},
		{
			major:        "1",
			minor:        "22",
			expErr:       true,
			operatorYaml: o1,
		},
		{
			major:        "1",
			minor:        "23",
			expErr:       false,
			operatorYaml: o2,
		},
		{

			},
			experr: true,
		},
	}

	for k, testcase := range testcases {
		mls, err := liveness.MakeMergeLocalsState(testcase.partition, testcase.vars)
		t.Logf("tc %d err is %v\n", k, err)
		if testcase.experr && err == nil {
			t.Fatalf("tc:%d missing error mls %v", k, mls)
		} else if !testcase.experr && err != nil {
			t.Fatalf("tc:%d unexpected error mls %v", k, err)
		}
		if mls != nil {

func (check *Checker) binary(x *operand, e ast.Expr, lhs, rhs ast.Expr, op token.Token, opPos token.Pos) {
	var y operand

	check.expr(nil, x, lhs)
	check.expr(nil, &y, rhs)

	if x.mode == invalid {
		return
	}
	if y.mode == invalid {
		x.mode = invalid
		x.expr = y.expr
		return
	}

	if isShift(op) {
		check.shift(x, &y, e, op)
		return
	}

func (check *Checker) binary(x *operand, e syntax.Expr, lhs, rhs syntax.Expr, op syntax.Operator) {
	var y operand

	check.expr(nil, x, lhs)
	check.expr(nil, &y, rhs)

	if x.mode == invalid {
		return
	}
	if y.mode == invalid {
		x.mode = invalid
		x.expr = y.expr
		return
	}

	if isShift(op) {
		check.shift(x, &y, e, op)
		return
	}

	}
	return n
}

// tcSlice typechecks an OSLICE or OSLICE3 node.
func tcSlice(n *ir.SliceExpr) ir.Node {
	n.X = DefaultLit(Expr(n.X), nil)
	n.Low = indexlit(Expr(n.Low))
	n.High = indexlit(Expr(n.High))
	n.Max = indexlit(Expr(n.Max))
	hasmax := n.Op().IsSlice3()
	l := n.X
	if l.Type() == nil {
		n.SetType(nil)
		return n
	}
	if l.Type().IsArray() {