1package blog23import "errors"45var (6 ErrPostTitleMissing = errors.New("post title is missing")7 ErrPostSlugMissing = errors.New("post slug is missing")8 ErrPostBodyMissing = errors.New("post body is missing")9 ErrPostSlugExists = errors.New("post with specified slug already exists")10 ErrPostPubDateExists = errors.New("post with specified publication date exists")11 ErrPostTitleExists = errors.New("post with specified title already exists")12 ErrNoSuchPost = errors.New("no such post")13)14Signatures reconstructed verbatim from vm/qfuncs — interface params keep their inline definitions.