view lib/ur/monad.ur @ 880:8e9f2d247dba

Testing nested queries
author Adam Chlipala <adamc@hcoop.net>
date Fri, 17 Jul 2009 12:25:34 -0400
parents 74e9e7642f08
children d1d0b18afd3d
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line source
fun exec [m ::: Type -> Type] (_ : monad m) [ts ::: {Type}] r (fd : folder ts) =
    foldR [m] [fn ts => m $ts]
    (fn [nm :: Name] [v :: Type] [rest :: {Type}] [[nm] ~ rest] action acc =>
        this <- action;
        others <- acc;
        return ({nm = this} ++ others))
    (return {}) [ts] fd r