annotate lib/ur/monad.ur @ 891:8f2159040bbb
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| author |
Adam Chlipala <adamc@hcoop.net> |
| date |
Sat, 18 Jul 2009 11:01:48 -0400 |
| parents |
74e9e7642f08 |
| children |
d1d0b18afd3d |
| rev |
line source |
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adamc@834
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1 fun exec [m ::: Type -> Type] (_ : monad m) [ts ::: {Type}] r (fd : folder ts) =
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2 foldR [m] [fn ts => m $ts]
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3 (fn [nm :: Name] [v :: Type] [rest :: {Type}] [[nm] ~ rest] action acc =>
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4 this <- action;
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5 others <- acc;
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6 return ({nm = this} ++ others))
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7 (return {}) [ts] fd r
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