Unexported types can be difficult to use when viewing documentation under go doc.

Example:

type hidden struct{}

func Exported() hidden { // Exported function with the `hidden` unexported return type
 return hidden{}
}

You can apply Export quick-fix to export the type. After the quick-fix is applied, type name will be capitalized:

type Hidden struct{}

func Exported() Hidden { // Fixed
 return Hidden{}
}