golang 질문

go env

set GOBIN=C:\go_study\bin

set GOROOT=C:\Program Files\Go

set GOPATH=C:\go_study

PS C:\go_study\src\section1> go run main

cannot find package "main" in any of:

C:\Program Files\Go\src\main (from $GOROOT)

C:\go_study\src\main (from $GOPATH)

관련된 에러가 나고 있습니다.

이유를 잘모르겠습니다.

PS C:\go_study\src\section1> go mod init main

go: creating new go.mod: module main

go: to add module requirements and sums:

go mod tidy

PS C:\go_study\src\section1> go mod tidy

PS C:\go_study\src\section1> go run main

helloworld.go:1:1: expected 'package', found pakcage

visual studio일 경우에는 어떻게 해결하나요?