panic unmarshaling map with omitempty present in nested embedded struct

[aexvir]

kinda similar to #400 but not really the same... at least I can't get to reproduce it with other pointers, just with map

• it doesn't happen if I remove one embed; e.g. var ord Product
• it doesn't happen if the omitempty is on a different type; e.g. Discounts *float64 json:"discounts,omitempty"`
• it doesn't happen if I remove the omitempty
• it happens regardless of the map value type; e.g. map[string]bool still panics

I tried more variations but right now I can't really remember all of them 😅
when using encoding/json it works just fine

code reproducing the issue

package main

import (
	"fmt"
	"github.com/goccy/go-json"
)

type Order struct {
	Product
}

type Product struct {
	Pricing
}

type Pricing struct {
	Retail    float64            `json:"price"`
	Discounts map[string]float64 `json:"discounts,omitempty"`
}

const data = `{"price": 1.6}`

func main() {
	var ord Order

	err := json.Unmarshal([]byte(data), &ord)
	if err != nil {
		fmt.Printf("error unmarshaling data: %s", err.Error())
	}

	_, _ = json.Marshal(ord)
}

when running this the output is a panic on

go-json/internal/encoder/vm/vm.go

Lines 18 to 26 in 41ad89f

	var code *encoder.Opcode
	if (ctx.Option.Flag & encoder.HTMLEscapeOption) != 0 {
	code = codeSet.EscapeKeyCode
	} else {
	code = codeSet.NoescapeKeyCode
	}
	for {
	switch code.Op {

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1042067ec]

goroutine 1 [running]:
github.com/goccy/go-json/internal/encoder/vm.Run(0x14000118c30, {0x1400015e000?, 0x0?, 0x400?}, 0x1400014c0e0?)
	/Users/aexvir/go/pkg/mod/github.com/goccy/go-json@v0.9.11/internal/encoder/vm/vm.go:26 +0x6c
github.com/goccy/go-json.encodeRunCode(0x14000157df8?, {0x1400015e000?, 0x104388a78?, 0x14000157dc0?}, 0x140001220c0?)
	/Users/aexvir/go/pkg/mod/github.com/goccy/go-json@v0.9.11/encode.go:310 +0x64
github.com/goccy/go-json.encode(0x14000118c30, {0x10427e940, 0x14000110400})
	/Users/aexvir/go/pkg/mod/github.com/goccy/go-json@v0.9.11/encode.go:235 +0x23c
github.com/goccy/go-json.marshal({0x10427e940, 0x14000110400}, {0x0, 0x0, 0x14000110400?})
	/Users/aexvir/go/pkg/mod/github.com/goccy/go-json@v0.9.11/encode.go:150 +0xb8
github.com/goccy/go-json.MarshalWithOption(...)
	/Users/aexvir/go/pkg/mod/github.com/goccy/go-json@v0.9.11/json.go:186
github.com/goccy/go-json.Marshal({0x10427e940?, 0x14000110400?})
	/Users/aexvir/go/pkg/mod/github.com/goccy/go-json@v0.9.11/json.go:171 +0x30
main.main()
	/tmp/jsondebug/main.go:31 +0x108
exit status 2

[aexvir]

oh, nevermind, I just found #391 🤦🏻 sorry for the duplicate