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annotate lib/ur/basis.urs @ 641:b98f547a6a45

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RPC returning an option
author Adam Chlipala <adamc@hcoop.net>
date Sun, 08 Mar 2009 13:41:55 -0400
parents e68de2a5506b
children 81c5c2674215
rev   line source
adamc@56 1 type int
adamc@56 2 type float
adamc@56 3 type string
adamc@436 4 type time
adamc@91 5
adamc@119 6 type unit = {}
adamc@119 7
adamc@186 8 datatype bool = False | True
adamc@186 9
adamc@288 10 datatype option t = None | Some of t
adamc@284 11
adamc@91 12
adamc@256 13 (** Basic type classes *)
adamc@256 14
adamc@256 15 class eq
adamc@256 16 val eq : t ::: Type -> eq t -> t -> t -> bool
adamc@257 17 val ne : t ::: Type -> eq t -> t -> t -> bool
adamc@256 18 val eq_int : eq int
adamc@394 19 val eq_float : eq float
adamc@256 20 val eq_string : eq string
adamc@256 21 val eq_bool : eq bool
adamc@437 22 val eq_time : eq time
adamc@422 23 val mkEq : t ::: Type -> (t -> t -> bool) -> eq t
adamc@256 24
adamc@389 25 class num
adamc@417 26 val zero : t ::: Type -> num t -> t
adamc@389 27 val neg : t ::: Type -> num t -> t -> t
adamc@389 28 val plus : t ::: Type -> num t -> t -> t -> t
adamc@389 29 val minus : t ::: Type -> num t -> t -> t -> t
adamc@389 30 val times : t ::: Type -> num t -> t -> t -> t
adamc@389 31 val div : t ::: Type -> num t -> t -> t -> t
adamc@389 32 val mod : t ::: Type -> num t -> t -> t -> t
adamc@389 33 val num_int : num int
adamc@390 34 val num_float : num float
adamc@389 35
adamc@391 36 class ord
adamc@391 37 val lt : t ::: Type -> ord t -> t -> t -> bool
adamc@391 38 val le : t ::: Type -> ord t -> t -> t -> bool
adamc@391 39 val gt : t ::: Type -> ord t -> t -> t -> bool
adamc@391 40 val ge : t ::: Type -> ord t -> t -> t -> bool
adamc@391 41 val ord_int : ord int
adamc@394 42 val ord_float : ord float
adamc@394 43 val ord_string : ord string
adamc@394 44 val ord_bool : ord bool
adamc@437 45 val ord_time : ord time
adamc@391 46
adamc@256 47
adamc@283 48 (** String operations *)
adamc@283 49
adamc@283 50 val strcat : string -> string -> string
adamc@283 51
adamc@286 52 class show
adamc@286 53 val show : t ::: Type -> show t -> t -> string
adamc@286 54 val show_int : show int
adamc@286 55 val show_float : show float
adamc@286 56 val show_string : show string
adamc@286 57 val show_bool : show bool
adamc@436 58 val show_time : show time
adamc@452 59 val mkShow : t ::: Type -> (t -> string) -> show t
adamc@286 60
adamc@290 61 class read
adamc@290 62 val read : t ::: Type -> read t -> string -> option t
adamc@292 63 val readError : t ::: Type -> read t -> string -> t
adamc@292 64 (* [readError] calls [error] if the input is malformed. *)
adamc@290 65 val read_int : read int
adamc@290 66 val read_float : read float
adamc@290 67 val read_string : read string
adamc@290 68 val read_bool : read bool
adamc@436 69 val read_time : read time
adamc@288 70
adamc@283 71
adamc@564 72 (** * Monads *)
adamc@564 73
adamc@564 74 class monad :: Type -> Type
adamc@564 75 val return : m ::: (Type -> Type) -> t ::: Type
adamc@564 76 -> monad m
adamc@564 77 -> t -> m t
adamc@564 78 val bind : m ::: (Type -> Type) -> t1 ::: Type -> t2 ::: Type
adamc@564 79 -> monad m
adamc@564 80 -> m t1 -> (t1 -> m t2)
adamc@564 81 -> m t2
adamc@564 82
adamc@456 83 con transaction :: Type -> Type
adamc@564 84 val transaction_monad : monad transaction
adamc@456 85
adamc@565 86 con source :: Type -> Type
adamc@565 87 val source : t ::: Type -> t -> transaction (source t)
adamc@575 88 val set : t ::: Type -> source t -> t -> transaction unit
adamc@601 89 val get : t ::: Type -> source t -> transaction t
adamc@565 90
adamc@565 91 con signal :: Type -> Type
adamc@565 92 val signal_monad : monad signal
adamc@565 93 val signal : t ::: Type -> source t -> signal t
adamc@456 94
adamc@456 95
adamc@456 96 (** HTTP operations *)
adamc@456 97
adamc@456 98 val requestHeader : string -> transaction (option string)
adamc@456 99
adamc@459 100 con http_cookie :: Type -> Type
adamc@459 101 val getCookie : t ::: Type -> http_cookie t -> transaction (option t)
adamc@459 102 val setCookie : t ::: Type -> http_cookie t -> t -> transaction unit
adamc@459 103
adamc@456 104
adamc@566 105 (** JavaScript-y gadgets *)
adamc@566 106
adamc@566 107 val alert : string -> transaction unit
adamc@566 108
adamc@566 109
adamc@203 110 (** SQL *)
adamc@203 111
adamc@203 112 con sql_table :: {Type} -> Type
adamc@203 113
adamc@204 114 (*** Queries *)
adamc@204 115
adamc@233 116 con sql_query :: {{Type}} -> {Type} -> Type
adamc@233 117 con sql_query1 :: {{Type}} -> {{Type}} -> {Type} -> Type
adamc@234 118 con sql_exp :: {{Type}} -> {{Type}} -> {Type} -> Type -> Type
adamc@204 119
adamc@223 120 con sql_subset :: {{Type}} -> {{Type}} -> Type
adamc@223 121 val sql_subset : keep_drop :: {({Type} * {Type})}
adamc@354 122 -> sql_subset
adamc@621 123 (map (fn fields :: ({Type} * {Type}) => fields.1 ++ fields.2) keep_drop)
adamc@621 124 (map (fn fields :: ({Type} * {Type}) => fields.1) keep_drop)
adamc@354 125 val sql_subset_all : tables :: {{Type}} -> sql_subset tables tables
adamc@223 126
adamc@229 127 val sql_query1 : tables ::: {{Type}}
adamc@354 128 -> grouped ::: {{Type}}
adamc@354 129 -> selectedFields ::: {{Type}}
adamc@354 130 -> selectedExps ::: {Type}
adamc@621 131 -> {From : $(map (fn fields :: {Type} => sql_table fields) tables),
adamc@354 132 Where : sql_exp tables [] [] bool,
adamc@354 133 GroupBy : sql_subset tables grouped,
adamc@354 134 Having : sql_exp grouped tables [] bool,
adamc@354 135 SelectFields : sql_subset grouped selectedFields,
adamc@621 136 SelectExps : $(map (fn (t :: Type) => sql_exp grouped tables [] t) selectedExps) }
adamc@354 137 -> sql_query1 tables selectedFields selectedExps
adamc@229 138
adamc@229 139 type sql_relop
adamc@229 140 val sql_union : sql_relop
adamc@229 141 val sql_intersect : sql_relop
adamc@229 142 val sql_except : sql_relop
adamc@260 143 val sql_relop : tables1 ::: {{Type}}
adamc@354 144 -> tables2 ::: {{Type}}
adamc@354 145 -> selectedFields ::: {{Type}}
adamc@354 146 -> selectedExps ::: {Type}
adamc@354 147 -> sql_relop
adamc@354 148 -> sql_query1 tables1 selectedFields selectedExps
adamc@354 149 -> sql_query1 tables2 selectedFields selectedExps
adamc@354 150 -> sql_query1 selectedFields selectedFields selectedExps
adamc@229 151
adamc@230 152 type sql_direction
adamc@230 153 val sql_asc : sql_direction
adamc@230 154 val sql_desc : sql_direction
adamc@230 155
adamc@234 156 con sql_order_by :: {{Type}} -> {Type} -> Type
adamc@234 157 val sql_order_by_Nil : tables ::: {{Type}} -> exps :: {Type} -> sql_order_by tables exps
adamc@234 158 val sql_order_by_Cons : tables ::: {{Type}} -> exps ::: {Type} -> t ::: Type
adamc@354 159 -> sql_exp tables [] exps t -> sql_direction
adamc@354 160 -> sql_order_by tables exps
adamc@354 161 -> sql_order_by tables exps
adamc@230 162
adamc@231 163 type sql_limit
adamc@231 164 val sql_no_limit : sql_limit
adamc@231 165 val sql_limit : int -> sql_limit
adamc@354 166
adamc@232 167 type sql_offset
adamc@232 168 val sql_no_offset : sql_offset
adamc@232 169 val sql_offset : int -> sql_offset
adamc@232 170
adamc@229 171 val sql_query : tables ::: {{Type}}
adamc@354 172 -> selectedFields ::: {{Type}}
adamc@354 173 -> selectedExps ::: {Type}
adamc@354 174 -> {Rows : sql_query1 tables selectedFields selectedExps,
adamc@354 175 OrderBy : sql_order_by tables selectedExps,
adamc@354 176 Limit : sql_limit,
adamc@354 177 Offset : sql_offset}
adamc@354 178 -> sql_query selectedFields selectedExps
adamc@204 179
adamc@354 180 val sql_field : otherTabs ::: {{Type}} -> otherFields ::: {Type}
adamc@354 181 -> fieldType ::: Type -> agg ::: {{Type}}
adamc@354 182 -> exps ::: {Type}
adamc@354 183 -> tab :: Name -> field :: Name
adamc@354 184 -> sql_exp
adamc@354 185 ([tab = [field = fieldType] ++ otherFields] ++ otherTabs)
adamc@354 186 agg exps fieldType
adamc@234 187
adamc@354 188 val sql_exp : tabs ::: {{Type}} -> agg ::: {{Type}} -> t ::: Type -> rest ::: {Type}
adamc@354 189 -> nm :: Name
adamc@354 190 -> sql_exp tabs agg ([nm = t] ++ rest) t
adamc@209 191
adamc@221 192 class sql_injectable
adamc@221 193 val sql_bool : sql_injectable bool
adamc@221 194 val sql_int : sql_injectable int
adamc@221 195 val sql_float : sql_injectable float
adamc@221 196 val sql_string : sql_injectable string
adamc@437 197 val sql_time : sql_injectable time
adamc@467 198 val sql_option_bool : sql_injectable (option bool)
adamc@467 199 val sql_option_int : sql_injectable (option int)
adamc@467 200 val sql_option_float : sql_injectable (option float)
adamc@467 201 val sql_option_string : sql_injectable (option string)
adamc@467 202 val sql_option_time : sql_injectable (option time)
adamc@354 203 val sql_inject : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 204 -> t ::: Type
adamc@354 205 -> sql_injectable t -> t -> sql_exp tables agg exps t
adamc@209 206
adamc@470 207 val sql_is_null : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@470 208 -> t ::: Type
adamc@470 209 -> sql_exp tables agg exps (option t)
adamc@470 210 -> sql_exp tables agg exps bool
adamc@470 211
adamc@559 212 class sql_arith
adamc@559 213 val sql_int_arith : sql_arith int
adamc@559 214 val sql_float_arith : sql_arith float
adamc@559 215
adamc@220 216 con sql_unary :: Type -> Type -> Type
adamc@220 217 val sql_not : sql_unary bool bool
adamc@354 218 val sql_unary : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 219 -> arg ::: Type -> res ::: Type
adamc@354 220 -> sql_unary arg res -> sql_exp tables agg exps arg
adamc@354 221 -> sql_exp tables agg exps res
adamc@220 222
adamc@559 223 val sql_neg : t ::: Type -> sql_arith t -> sql_unary t t
adamc@559 224
adamc@220 225 con sql_binary :: Type -> Type -> Type -> Type
adamc@220 226 val sql_and : sql_binary bool bool bool
adamc@220 227 val sql_or : sql_binary bool bool bool
adamc@234 228 val sql_binary : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 229 -> arg1 ::: Type -> arg2 ::: Type -> res ::: Type
adamc@354 230 -> sql_binary arg1 arg2 res -> sql_exp tables agg exps arg1
adamc@354 231 -> sql_exp tables agg exps arg2
adamc@354 232 -> sql_exp tables agg exps res
adamc@220 233
adamc@559 234 val sql_plus : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 235 val sql_minus : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 236 val sql_times : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 237 val sql_div : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 238 val sql_mod : sql_binary int int int
adamc@559 239
adamc@559 240 val sql_eq : t ::: Type -> sql_binary t t bool
adamc@559 241 val sql_ne : t ::: Type -> sql_binary t t bool
adamc@559 242 val sql_lt : t ::: Type -> sql_binary t t bool
adamc@559 243 val sql_le : t ::: Type -> sql_binary t t bool
adamc@559 244 val sql_gt : t ::: Type -> sql_binary t t bool
adamc@559 245 val sql_ge : t ::: Type -> sql_binary t t bool
adamc@203 246
adamc@235 247 val sql_count : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@544 248 -> sql_exp tables agg exps int
adamc@235 249
adamc@236 250 con sql_aggregate :: Type -> Type
adamc@354 251 val sql_aggregate : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 252 -> t ::: Type
adamc@354 253 -> sql_aggregate t -> sql_exp agg agg exps t
adamc@354 254 -> sql_exp tables agg exps t
adamc@236 255
adamc@236 256 class sql_summable
adamc@236 257 val sql_summable_int : sql_summable int
adamc@236 258 val sql_summable_float : sql_summable float
adamc@236 259 val sql_avg : t ::: Type -> sql_summable t -> sql_aggregate t
adamc@236 260 val sql_sum : t ::: Type -> sql_summable t -> sql_aggregate t
adamc@236 261
adamc@236 262 class sql_maxable
adamc@236 263 val sql_maxable_int : sql_maxable int
adamc@236 264 val sql_maxable_float : sql_maxable float
adamc@236 265 val sql_maxable_string : sql_maxable string
adamc@437 266 val sql_maxable_time : sql_maxable time
adamc@236 267 val sql_max : t ::: Type -> sql_maxable t -> sql_aggregate t
adamc@236 268 val sql_min : t ::: Type -> sql_maxable t -> sql_aggregate t
adamc@236 269
adamc@441 270 con sql_nfunc :: Type -> Type
adamc@441 271 val sql_nfunc : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@441 272 -> t ::: Type
adamc@441 273 -> sql_nfunc t -> sql_exp tables agg exps t
adamc@441 274 val sql_current_timestamp : sql_nfunc time
adamc@441 275
adamc@235 276
adamc@243 277 (*** Executing queries *)
adamc@243 278
adamc@354 279 val query : tables ::: {{Type}} -> exps ::: {Type}
adamc@629 280 -> [tables ~ exps] =>
adamc@354 281 state ::: Type
adamc@354 282 -> sql_query tables exps
adamc@621 283 -> ($(exps ++ map (fn fields :: {Type} => $fields) tables)
adamc@354 284 -> state
adamc@354 285 -> transaction state)
adamc@354 286 -> state
adamc@354 287 -> transaction state
adamc@243 288
adamc@243 289
adamc@299 290 (*** Database mutators *)
adamc@299 291
adamc@299 292 type dml
adamc@299 293 val dml : dml -> transaction unit
adamc@299 294
adamc@299 295 val insert : fields ::: {Type}
adamc@354 296 -> sql_table fields
adamc@621 297 -> $(map (fn t :: Type => sql_exp [] [] [] t) fields)
adamc@354 298 -> dml
adamc@299 299
adamc@403 300 val update : unchanged ::: {Type} -> changed :: {Type} ->
adamc@629 301 [changed ~ unchanged] =>
adamc@621 302 $(map (fn t :: Type => sql_exp [T = changed ++ unchanged] [] [] t) changed)
adamc@354 303 -> sql_table (changed ++ unchanged)
adamc@354 304 -> sql_exp [T = changed ++ unchanged] [] [] bool
adamc@354 305 -> dml
adamc@299 306
adamc@299 307 val delete : fields ::: {Type}
adamc@354 308 -> sql_table fields
adamc@354 309 -> sql_exp [T = fields] [] [] bool
adamc@354 310 -> dml
adamc@299 311
adamc@338 312 (*** Sequences *)
adamc@338 313
adamc@338 314 type sql_sequence
adamc@338 315 val nextval : sql_sequence -> transaction int
adamc@338 316
adamc@299 317
adamc@203 318 (** XML *)
adamc@203 319
adamc@139 320 con tag :: {Type} -> {Unit} -> {Unit} -> {Type} -> {Type} -> Type
adamc@91 321
adamc@91 322
adamc@139 323 con xml :: {Unit} -> {Type} -> {Type} -> Type
adamc@141 324 val cdata : ctx ::: {Unit} -> use ::: {Type} -> string -> xml ctx use []
adamc@354 325 val tag : attrsGiven ::: {Type} -> attrsAbsent ::: {Type}
adamc@354 326 -> ctxOuter ::: {Unit} -> ctxInner ::: {Unit}
adamc@354 327 -> useOuter ::: {Type} -> useInner ::: {Type}
adamc@354 328 -> bindOuter ::: {Type} -> bindInner ::: {Type}
adamc@629 329 -> [attrsGiven ~ attrsAbsent] =>
adamc@629 330 [useOuter ~ useInner] =>
adamc@629 331 [bindOuter ~ bindInner] =>
adamc@629 332 $attrsGiven
adamc@629 333 -> tag (attrsGiven ++ attrsAbsent)
adamc@629 334 ctxOuter ctxInner useOuter bindOuter
adamc@629 335 -> xml ctxInner useInner bindInner
adamc@629 336 -> xml ctxOuter (useOuter ++ useInner) (bindOuter ++ bindInner)
adamc@140 337 val join : ctx ::: {Unit}
adamc@139 338 -> use1 ::: {Type} -> bind1 ::: {Type} -> bind2 ::: {Type}
adamc@629 339 -> [use1 ~ bind1] => [bind1 ~ bind2] =>
adamc@354 340 xml ctx use1 bind1
adamc@354 341 -> xml ctx (use1 ++ bind1) bind2
adamc@354 342 -> xml ctx use1 (bind1 ++ bind2)
adamc@354 343 val useMore : ctx ::: {Unit} -> use1 ::: {Type} -> use2 ::: {Type}
adamc@354 344 -> bind ::: {Type}
adamc@629 345 -> [use1 ~ use2] =>
adamc@354 346 xml ctx use1 bind
adamc@354 347 -> xml ctx (use1 ++ use2) bind
adamc@91 348
adamc@110 349 con xhtml = xml [Html]
adamc@139 350 con page = xhtml [] []
adamc@325 351 con xbody = xml [Body] [] []
adamc@326 352 con xtr = xml [Body, Tr] [] []
adamc@361 353 con xform = xml [Body, Form] [] []
adamc@110 354
adamc@204 355 (*** HTML details *)
adamc@204 356
adamc@140 357 con html = [Html]
adamc@140 358 con head = [Head]
adamc@140 359 con body = [Body]
adamc@361 360 con form = [Body, Form]
adamc@332 361 con tabl = [Body, Table]
adamc@332 362 con tr = [Body, Tr]
adamc@93 363
adamc@568 364 val dyn : ctx ::: {Unit} -> use ::: {Type} -> bind ::: {Type} -> unit
adamc@568 365 -> tag [Signal = signal (xml ctx use bind)] ctx [] use bind
adamc@568 366
adamc@140 367 val head : unit -> tag [] html head [] []
adamc@140 368 val title : unit -> tag [] head [] [] []
adamc@110 369
adamc@140 370 val body : unit -> tag [] html body [] []
adamc@354 371 con bodyTag = fn (attrs :: {Type}) =>
adamc@354 372 ctx ::: {Unit} ->
adamc@629 373 [[Body] ~ ctx] =>
adamc@354 374 unit -> tag attrs ([Body] ++ ctx) ([Body] ++ ctx) [] []
adamc@354 375 con bodyTagStandalone = fn (attrs :: {Type}) =>
adamc@354 376 ctx ::: {Unit}
adamc@629 377 -> [[Body] ~ ctx] =>
adamc@354 378 unit -> tag attrs ([Body] ++ ctx) [] [] []
adamc@141 379
adamc@141 380 val br : bodyTagStandalone []
adamc@119 381
adamc@140 382 val p : bodyTag []
adamc@140 383 val b : bodyTag []
adamc@140 384 val i : bodyTag []
adamc@407 385 val tt : bodyTag []
adamc@140 386 val font : bodyTag [Size = int, Face = string]
adamc@140 387
adamc@140 388 val h1 : bodyTag []
adamc@443 389 val h2 : bodyTag []
adamc@443 390 val h3 : bodyTag []
adamc@443 391 val h4 : bodyTag []
adamc@469 392
adamc@140 393 val li : bodyTag []
adamc@469 394 val ol : bodyTag []
adamc@469 395 val ul : bodyTag []
adamc@140 396
adamc@410 397 val hr : bodyTag []
adamc@410 398
adamc@566 399 val a : bodyTag [Link = transaction page, Onclick = transaction unit]
adamc@140 400
adamc@361 401 val form : ctx ::: {Unit} -> bind ::: {Type}
adamc@629 402 -> [[Body] ~ ctx] =>
adamc@354 403 xml form [] bind
adamc@354 404 -> xml ([Body] ++ ctx) [] []
adamc@361 405 con formTag = fn (ty :: Type) (inner :: {Unit}) (attrs :: {Type}) =>
adamc@354 406 ctx ::: {Unit}
adamc@629 407 -> [[Form] ~ ctx] =>
adamc@354 408 nm :: Name -> unit
adamc@361 409 -> tag attrs ([Form] ++ ctx) inner [] [nm = ty]
adamc@598 410 val textbox : formTag string [] [Value = string, Size = int, Source = source string]
adamc@444 411 val password : formTag string [] [Value = string, Size = int]
adamc@444 412 val textarea : formTag string [] [Rows = int, Cols = int]
adamc@153 413
adamc@361 414 val checkbox : formTag bool [] [Checked = bool]
adamc@190 415
adamc@153 416 con radio = [Body, Radio]
adamc@361 417 val radio : formTag string radio []
adamc@153 418 val radioOption : unit -> tag [Value = string] radio [] [] []
adamc@142 419
adamc@154 420 con select = [Select]
adamc@361 421 val select : formTag string select []
adamc@422 422 val option : unit -> tag [Value = string, Selected = bool] select [] [] []
adamc@154 423
adamc@568 424 val submit : ctx ::: {Unit} -> use ::: {Type}
adamc@629 425 -> [[Form] ~ ctx] =>
adamc@354 426 unit
adamc@406 427 -> tag [Value = string, Action = $use -> transaction page]
adamc@361 428 ([Form] ++ ctx) ([Form] ++ ctx) use []
adamc@283 429
adamc@601 430 (*** AJAX-oriented widgets *)
adamc@601 431
adamc@601 432 con cformTag = fn (attrs :: {Type}) =>
adamc@601 433 ctx ::: {Unit}
adamc@629 434 -> [[Body] ~ ctx] =>
adamc@601 435 unit -> tag attrs ([Body] ++ ctx) [] [] []
adamc@601 436
adamc@601 437 val ctextbox : cformTag [Value = string, Size = int, Source = source string]
adamc@601 438 val button : cformTag [Value = string, Onclick = transaction unit]
adamc@601 439
adamc@325 440 (*** Tables *)
adamc@325 441
adamc@629 442 val tabl : other ::: {Unit} -> [other ~ [Body, Table]] =>
adamc@406 443 unit -> tag [Border = int] ([Body] ++ other) ([Body, Table] ++ other) [] []
adamc@629 444 val tr : other ::: {Unit} -> [other ~ [Body, Table, Tr]] =>
adamc@406 445 unit -> tag [] ([Body, Table] ++ other) ([Body, Tr] ++ other) [] []
adamc@629 446 val th : other ::: {Unit} -> [other ~ [Body, Tr]] =>
adamc@406 447 unit -> tag [] ([Body, Tr] ++ other) ([Body] ++ other) [] []
adamc@629 448 val td : other ::: {Unit} -> [other ~ [Body, Tr]] =>
adamc@406 449 unit -> tag [] ([Body, Tr] ++ other) ([Body] ++ other) [] []
adamc@325 450
adamc@283 451
adamc@283 452 (** Aborting *)
adamc@283 453
adamc@283 454 val error : t ::: Type -> xml [Body] [] [] -> t