Ur/Web: tests/disjoint.ur annotate

Tutorial: hyperlinks for metaprogramming and row types

author	Adam Chlipala <adam@chlipala.net>
date	Wed, 20 Jul 2011 08:14:49 -0400
parents	71bafe66dbe1
children

rev	line source
adamc@86	1 con c1 = fn x :: Name => [x] ~ [A] => [x = int, A = string]
adamc@84	2 con c2 = fn x :: Name => [x] ~ [A] => [A, x]
adamc@84	3 con c3 = fn x :: Name => [A] ~ [x] => [x, A]
adamc@84	4 con c4 = fn x :: Name => [A] ~ [x] => [A, x]
adamc@84	5
adamc@84	6 con c5 = fn r1 :: {Type} => fn r2 => r1 ~ r2 => r1 ++ r2
adamc@84	7 con c6 = fn r1 :: {Type} => fn r2 => r2 ~ r1 => r1 ++ r2
adamc@84	8
adamc@86	9 con c7 = fn x :: Name => fn r => [x] ~ r => [x = int] ++ r
adamc@86	10
adamc@86	11 val vt1 = fn x : $(c1 #B) => x.B
adamc@86	12 val vt2 = fn x : $(c1 #B) => x.A
adamc@86	13 val vt3 = fn x : $(c1 #C) => x.A
adamc@86	14 val vt4 = fn x : $(c1 #C) => x.A
adamc@86	15 (*
adamc@86	16 val vtX = fn x : $(c1 #A) => x.A
adamc@86	17 val vtX = fn x : $(c1 #A) => x.A
adamc@86	18 *)
adamc@85	19
adamc@85	20 val v1 = fn x :: Name => fn [x] ~ [A] => fn y : {x : int, A : string} => y.x
adamc@86	21
adamc@86	22 val vt5 = v1 [#B] {A = "Hi", B = 0}
adamc@86	23 (*
adamc@86	24 val vtX = v1 [#A] {A = "Hi", A = 0}
adamc@86	25 *)
adamc@86	26
adamc@86	27 val v2 = fn x :: Name => fn r :: {Type} => fn y : $(c7 x r) => fn [x] ~ r => y.x
adamc@86	28 val vt6 = v2 [#A] [[B = float, C = string]] {A = 8, B = 8.0, C = "8"}
adamc@86	29
adamc@86	30 (*
adamc@86	31 val vtX = v2 [#A] [[B = float, B = string]] {A = 8, B = 8.0, B = "8"}
adamc@86	32 val vtX = v2 [#A] [[A = float, B = string]] {A = 8, A = 8.0, B = "8"}
adamc@86	33 *)
adamc@87	34
adamc@87	35 val main = vt6

Mercurial > urweb