## Mercurial > urweb

### view tests/disjoint.ur @ 2237:e79ef5792c8b

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Fix bug in redundancy checking and use finer formula for UPDATE statements.

author | Ziv Scully <ziv@mit.edu> |
---|---|

date | Sun, 05 Jul 2015 23:57:28 -0700 |

parents | 71bafe66dbe1 |

children |

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con c1 = fn x :: Name => [x] ~ [A] => [x = int, A = string] con c2 = fn x :: Name => [x] ~ [A] => [A, x] con c3 = fn x :: Name => [A] ~ [x] => [x, A] con c4 = fn x :: Name => [A] ~ [x] => [A, x] con c5 = fn r1 :: {Type} => fn r2 => r1 ~ r2 => r1 ++ r2 con c6 = fn r1 :: {Type} => fn r2 => r2 ~ r1 => r1 ++ r2 con c7 = fn x :: Name => fn r => [x] ~ r => [x = int] ++ r val vt1 = fn x : $(c1 #B) => x.B val vt2 = fn x : $(c1 #B) => x.A val vt3 = fn x : $(c1 #C) => x.A val vt4 = fn x : $(c1 #C) => x.A (* val vtX = fn x : $(c1 #A) => x.A val vtX = fn x : $(c1 #A) => x.A *) val v1 = fn x :: Name => fn [x] ~ [A] => fn y : {x : int, A : string} => y.x val vt5 = v1 [#B] {A = "Hi", B = 0} (* val vtX = v1 [#A] {A = "Hi", A = 0} *) val v2 = fn x :: Name => fn r :: {Type} => fn y : $(c7 x r) => fn [x] ~ r => y.x val vt6 = v2 [#A] [[B = float, C = string]] {A = 8, B = 8.0, C = "8"} (* val vtX = v2 [#A] [[B = float, B = string]] {A = 8, B = 8.0, B = "8"} val vtX = v2 [#A] [[A = float, B = string]] {A = 8, A = 8.0, B = "8"} *) val main = vt6