what's package name of subfolder that import it

[Shuang Lin]

- io_extra/
  - file.go
- main.go

how to import io_extra/file.go in main.go?

import "io_extra"

panic:

could not import io_extra (not found provider for types.Importer)

[七叶]

• gomod project: auto load from souce
• custome pkg: ctx.AddImport / ctx.AddImportDir