[BUG] The example in validator/README.md would fail when running with -race in go1.21

[ericuni]

go test -race -v -gcflags="all=-l -N" -cover -run Example

go env output

GO111MODULE='on'
GOARCH='amd64'
GOBIN='/data00/home/liuqi.victor/go/bin'
GOCACHE='/data00/home/liuqi.victor/.cache/go-build'
GOENV='/data00/home/liuqi.victor/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/data00/home/liuqi.victor/go/pkg/mod'
GOOS='linux'
GOPATH='/data00/home/liuqi.victor/go'
GOPROXY='https://go-mod-proxy.byted.org|https://goproxy.cn|https://proxy.golang.org|direct'
GOROOT='/data00/home/liuqi.victor/sdk/go1.21.13'
GOSUMDB='sum.golang.google.cn'
GOTMPDIR='/tmp/go'
GOTOOLCHAIN='auto'
GOTOOLDIR='/data00/home/liuqi.victor/sdk/go1.21.13/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.13'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/data00/home/liuqi.victor/git/code/golang/playground/go.mod'
GOWORK='/data00/home/liuqi.victor/git/code/golang/go.work'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go/go-build1951969996=/tmp/go-build -gno-record-gcc-switches'

go test output

=== RUN   Example
runtime: pointer 0xc00029c9b0 to unused region of span span.base()=0xc000430000 span.limit=0xc000433f00 span.state=1
runtime: found in object at *(0xc0001239b0+0x8)
object=0xc0001239b0 s.base()=0xc000122000 s.limit=0xc000123fe0 s.spanclass=10 s.elemsize=48 s.state=mSpanInUse
 *(object+0) = 0xc0003efc20
 *(object+8) = 0xc00029c9b0 <==
 *(object+16) = 0xc000123740
 *(object+24) = 0x0
 *(object+32) = 0x0
 *(object+40) = 0x0
fatal error: found bad pointer in Go heap (incorrect use of unsafe or cgo?)

runtime stack:
runtime.throw({0xcdf8e0?, 0x6?})
        /data00/home/liuqi.victor/sdk/go1.21.13/src/runtime/panic.go:1077 +0x5c fp=0x7fd1e9ffac90 sp=0x7fd1e9ffac60 pc=0x47b8fc
runtime.badPointer(0x7fd24a74c618, 0xc0003efc20?, 0xc0001239b0, 0x2d?)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/runtime/mbitmap.go:321 +0xa5 fp=0x7fd1e9fface8 sp=0x7fd1e9ffac90 pc=0x453145
runtime.findObject(0xc00029c9b0, 0x30?, 0x7fd1e9ffad68?)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/runtime/mbitmap.go:364 +0xd9 fp=0x7fd1e9ffad38 sp=0x7fd1e9fface8 pc=0x4533b9
runtime.scanobject(0xc0001239b0, 0xc000041c40)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/runtime/mgcmark.go:1335 +0x125 fp=0x7fd1e9ffadc0 sp=0x7fd1e9ffad38 pc=0x4601a5
runtime.gcDrain(0xc000041c40, 0x3)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/runtime/mgcmark.go:1103 +0x17b fp=0x7fd1e9ffae18 sp=0x7fd1e9ffadc0 pc=0x45fa7b
runtime.gcBgMarkWorker.func2()
        /data00/home/liuqi.victor/sdk/go1.21.13/src/runtime/mgc.go:1368 +0x97 fp=0x7fd1e9ffae68 sp=0x7fd1e9ffae18 pc=0x45bf77
runtime.systemstack()
        /data00/home/liuqi.victor/sdk/go1.21.13/src/runtime/asm_amd64.s:509 +0x4a fp=0x7fd1e9ffae78 sp=0x7fd1e9ffae68 pc=0x4b2cca

...

goroutine 1 [runnable]:
regexp/syntax.(*parser).push(0xc0004a7a00, 0xc00043c000)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/regexp/syntax/parse.go:294 +0x101f fp=0xc00042a850 sp=0xc00042a848 pc=0x6a371f
regexp/syntax.(*parser).concat(0xc0004a7a00)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/regexp/syntax/parse.go:496 +0x365 fp=0xc00042a950 sp=0xc00042a850 pc=0x6a55a5
regexp/syntax.(*parser).parseVerticalBar(0xc0004a7a00)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/regexp/syntax/parse.go:1327 +0x3b fp=0xc00042a9a8 sp=0xc00042a950 pc=0x6b051b
regexp/syntax.parse({0xc000480f00, 0x165}, 0xd4)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/regexp/syntax/parse.go:948 +0x257c fp=0xc00042b1a0 sp=0xc00042a9a8 pc=0x6adafc
regexp/syntax.Parse({0xc000480f00, 0x165}, 0xd4)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/regexp/syntax/parse.go:891 +0x99 fp=0xc00042b238 sp=0xc00042b1a0 pc=0x6ab4d9
regexp.compile({0xc000480f00, 0x165}, 0xd4, 0x0)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/regexp/regexp.go:174 +0xbb fp=0xc00042b4a0 sp=0xc00042b238 pc=0x6d6f7b
regexp.Compile({0xc000480f00, 0x165})
        /data00/home/liuqi.victor/sdk/go1.21.13/src/regexp/regexp.go:137 +0x96 fp=0xc00042b538 sp=0xc00042b4a0 pc=0x6d6d96
regexp.MustCompile({0xc000480f00, 0x165})
        /data00/home/liuqi.victor/sdk/go1.21.13/src/regexp/regexp.go:317 +0x7f fp=0xc00042b6a0 sp=0xc00042b538 pc=0x6d905f
github.com/nyaruka/phonenumbers.regexFor({0xc000480f00, 0x165})
        /data00/home/liuqi.victor/go/pkg/mod/github.com/nyaruka/[email protected]/phonenumbers.go:616 +0xc7 fp=0xc00042b738 sp=0xc00042b6a0 pc=0xa68f87
github.com/nyaruka/phonenumbers.isNumberMatchingDesc({0xc000373b05, 0xb}, 0xc0004a5440)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/nyaruka/[email protected]/phonenumbers.go:2096 +0x11d fp=0xc00042b840 sp=0xc00042b738 pc=0xa6c0fd
github.com/nyaruka/phonenumbers.getNumberTypeHelper({0xc000373b05, 0xb}, 0xc00049ef00)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/nyaruka/[email protected]/phonenumbers.go:2014 +0x21a fp=0xc00042ba18 sp=0xc00042b840 pc=0xa6b53a
github.com/nyaruka/phonenumbers.IsValidNumberForRegion(0xc000375c20, {0xc00032438e, 0x2})
        /data00/home/liuqi.victor/go/pkg/mod/github.com/nyaruka/[email protected]/phonenumbers.go:2131 +0x1fa fp=0xc00042bb00 sp=0xc00042ba18 pc=0xa6c49a
github.com/nyaruka/phonenumbers.IsValidNumber(0xc000375c20)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/nyaruka/[email protected]/phonenumbers.go:2107 +0x76 fp=0xc00042bb78 sp=0xc00042bb00 pc=0xa6c256
github.com/bytedance/go-tagexpr/v2/validator.init.1.func1({0xc00037d020, 0x1, 0x1})
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/validator/func.go:95 +0x398 fp=0xc00042bce8 sp=0xc00042bb78 pc=0xc045f8
github.com/bytedance/go-tagexpr/v2/validator.RegFunc.func1({0xc00037d020, 0x1, 0x1})
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/validator/func.go:39 +0x8a fp=0xc00042bd88 sp=0xc00042bce8 pc=0xc01c8a
github.com/bytedance/go-tagexpr/v2.(*funcExprNode).Run(0xc000375b00, {0xed4ec8, 0x11d8f40}, {0xc1b2bb, 0x6}, 0xc0001239b0)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/spec_func.go:136 +0x208 fp=0xc00042bf48 sp=0xc00042bd88 pc=0xbd15a8
github.com/bytedance/go-tagexpr/v2.(*groupExprNode).Run(0xc0000e5e40, {0xed4ec8, 0x11d8f40}, {0xc1b2bb, 0x6}, 0xc0001239b0)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/spec_operand.go:57 +0x125 fp=0xc00042c010 sp=0xc00042bf48 pc=0xbd4445
github.com/bytedance/go-tagexpr/v2.(*Expr).run(0xc00037ce20, {0xc1b2bb, 0x6}, 0xc0001239b0)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/expr.go:170 +0xe3 fp=0xc00042c0b8 sp=0xc00042c010 pc=0xbccae3
github.com/bytedance/go-tagexpr/v2.(*ExprHandler).Eval(0xc0002b8140)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/handler.go:105 +0x17c fp=0xc00042c178 sp=0xc00042c0b8 pc=0xbced9c
github.com/bytedance/go-tagexpr/v2/validator.(*Validator).Validate.func1.1(0xc0002b8140)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/validator/validator.go:78 +0x125 fp=0xc00042c538 sp=0xc00042c178 pc=0xc034a5
github.com/bytedance/go-tagexpr/v2.(*TagExpr).Range(0xc0001239b0, 0xc000123b30)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/tagexpr.go:889 +0x1be8 fp=0xc00042ce18 sp=0xc00042c538 pc=0xbf11e8
github.com/bytedance/go-tagexpr/v2/validator.(*Validator).Validate.func1(0xc0001239b0, {0x0, 0x0})
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/validator/validator.go:74 +0x52b fp=0xc00042cf70 sp=0xc00042ce18 pc=0xc032ab
github.com/bytedance/go-tagexpr/v2.(*VM).subRunAll(0xc0002a1f80, 0x0, {0x0, 0x0}, {0xc28ac0, 0xc00029c9b0, 0x16}, 0xc00029b8e8)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/tagexpr.go:199 +0xa2c fp=0xc00042d5e0 sp=0xc00042cf70 pc=0xbe324c
github.com/bytedance/go-tagexpr/v2.(*VM).RunAny(0xc0002a1f80, {0xc28ac0, 0xc00029c9b0}, 0xc00029b8e8)
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/tagexpr.go:166 +0x22e fp=0xc00042d6f8 sp=0xc00042d5e0 pc=0xbe254e
github.com/bytedance/go-tagexpr/v2/validator.(*Validator).Validate(0xc00037c960, {0xc28ac0, 0xc00029c9b0}, {0x0, 0x0, 0x0})
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/validator/validator.go:65 +0x367 fp=0xc00042d918 sp=0xc00042d6f8 pc=0xc028a7
github.com/bytedance/go-tagexpr/v2/validator.Validate({0xc28ac0, 0xc00029c9b0}, {0x0, 0x0, 0x0})
        /data00/home/liuqi.victor/go/pkg/mod/github.com/bytedance/go-tagexpr/[email protected]/validator/default.go:17 +0xca fp=0xc00042d9b0 sp=0xc00042d918 pc=0xc0178a
playground.Example()
        /data00/home/liuqi.victor/git/code/golang/playground/playground_test.go:27 +0x39b fp=0xc00042f068 sp=0xc00042d9b0 pc=0xc04efb
testing.runExample({{0xcc9b5a, 0x7}, 0xe41738, {0xce2c79, 0x236}, 0x0})
        /data00/home/liuqi.victor/sdk/go1.21.13/src/testing/run_example.go:63 +0xa93 fp=0xc00042f3a0 sp=0xc00042f068 pc=0x733213
testing.runExamples(0xc00042fcd0, {0x119b7a0, 0x1, 0x1})
        /data00/home/liuqi.victor/sdk/go1.21.13/src/testing/example.go:44 +0x485 fp=0xc00042f598 sp=0xc00042f3a0 pc=0x726b65
testing.(*M).Run(0xc0003efa40)
        /data00/home/liuqi.victor/sdk/go1.21.13/src/testing/testing.go:1927 +0x1938 fp=0xc00042fe20 sp=0xc00042f598 pc=0x745df8
main.main()
        _testmain.go:81 +0x245 fp=0xc00042ff68 sp=0xc00042fe20 pc=0xc08ea5
runtime.main()
        /data00/home/liuqi.victor/sdk/go1.21.13/src/runtime/proc.go:267 +0x267 fp=0xc00042ffe0 sp=0xc00042ff68 pc=0x47e187
runtime.goexit()
        /data00/home/liuqi.victor/sdk/go1.21.13/src/runtime/asm_amd64.s:1650 +0x1 fp=0xc00042ffe8 sp=0xc00042ffe0 pc=0x4b4c41