const internal/types/errors.BlankPkgName

3 uses

	internal/types/errors (current package)
		code_string.go#L13: 	_ = x[BlankPkgName-2]
		codes.go#L55: 	BlankPkgName

	go/types
		check.go#L357: 				check.error(file.Name, BlankPkgName, "invalid package name _")