rule/rule.go
func EmptyFile(path, pkg string) *File {
	return &File{
		File: &bzl.File{Path: path, Type: bzl.TypeBuild},
		Path: path,
		Pkg:  pkg,
	}
}
func EmptyFile(path, pkg string) *File {
	return &File{
		File: &bzl.File{Path: path, Type: bzl.TypeBuild},
		Path: path,
		Pkg:  pkg,
	}
}
// EmptyFile creates a File wrapped around an empty syntax tree.