BindStruct together with mapstructures remain

[florianrusch]

Preflight Checklist

• I have searched the issue tracker for an issue that matches the one I want to file, without success.
• I am not looking for support or already pursued the available support channels without success.
• I have checked the troubleshooting guide for my problem, without success.

Viper Version

1.18.2

Go Version

1.22

Config Source

Environment variables, Files

Format

YAML

Repl.it link

No response

Code reproducing the issue

package main

import (
	"github.com/spf13/viper"
	"log"
	"os"
	"strings"
)

type config struct {
	others any `mapstructure:",remain"`
}

func main() {
	_ = os.Setenv("CONFIG_FOOBAR", "some-value")

	var foundconfig config
	viper.AutomaticEnv()
	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
	err := viper.Unmarshal(&foundconfig)
	if err != nil {
		return 
	}

	log.Println(foundconfig)
}

Expected Behavior

I would expect, that foundconfig.others is containing map[string]any{"foobar": "some-value"}

Actual Behavior

foundconfig is empty

Steps To Reproduce

No response

Additional Information

No response

[github-actions]

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[sagikazarmark]

Unfortunately, this isn't how AutomaticEnv works. At the moment, it needs something to map environment variables against. The new bind struct feature would still only work with structs that have matching keys.