Re: [Haskell-cafe] Need Control.Monad.State
On 28 July 2010 14:07, aditya siram wrote: > I didn't realize the State monad wasn't part of the base install. Any > particular reason for this? Because there's no reason for it to be? GHC is bundled with enough libraries as it is (and with the exception of Cabal, it's not safe to upgrade any of them). However, mtl _is_ part of the Haskell Platform, so in that sense it's part of the _recommended_ base install... -- Ivan Lazar Miljenovic ivan.miljeno...@gmail.com IvanMiljenovic.wordpress.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Need Control.Monad.State
I didn't realize the State monad wasn't part of the base install. Any
particular reason for this?
-deech
On Tue, Jul 27, 2010 at 10:24 PM, Ivan Miljenovic wrote:
> On 28 July 2010 13:17, michael rice wrote:
> >
> > See below. Lot's of warnings. Is the install OK? If so, can I use the
> same *import*?
>
> Yeah, the install is OK. The meaning of the warnings are:
>
> * "Warning: -fallow-undecidable-instances is deprecated:" this GHC
> option has changed name, but the mtl package still uses the old name.
>
> * "Warning: Module `Prelude' is deprecated:" mtl doesn't specify any
> bounds on the version of the base library to be used (mainly because
> of historic reasons when it wasn't changing much and the Haskell
> community wasn't stressing versioning as much; note that the last
> version of mtl was released almost 2 years ago). Because a lot of
> packages broke when GHC-6.10.4 started shipping with base-4 (along
> with base-3 for compatability purposes) due to the differences in how
> exceptions were handled, if there is no upper bound on the version of
> base to be used then cabal-install plays it safe and uses base-3.
> However, the next version of GHC (6.14, which should be coming out
> later this year) will not ship with base-3, so GHC-6.12 included that
> warning message for people that kept trying to use base-3 that their
> code won't work with 6.14.
>
> So yes, now you can use "import Control.Monad.State".
>
> >
> > Michael
> >
> > --- On Tue, 7/27/10, Ivan Miljenovic wrote:
> >
> > >
> > > If it isn't installed, you can use cabal-install to install it:
> > >
> > > cabal install mtl
> > >
> > > --
> > > Ivan Lazar Miljenovic
> > > ivan.miljeno...@gmail.com
> > > IvanMiljenovic.wordpress.com
> > >
> >
> >
> > [mich...@localhost ~]$ cabal install mtl
> > Resolving dependencies...
> > Downloading mtl-1.1.0.2...
> > Configuring mtl-1.1.0.2...
> > Preprocessing library mtl-1.1.0.2...
> > Building mtl-1.1.0.2...
> > [ 1 of 21] Compiling Control.Monad.Identity ( Control/Monad/Identity.hs,
> dist/build/Control/Monad/Identity.o )
> >
> > Control/Monad/Cont.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/Cont/Class.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/Error.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/Error/Class.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/Identity.hs:1:0:
> > Warning: Module `Prelude' is deprecated:
> >You are using the old package `base' version 3.x.
> >Future GHC versions will not support base version 3.x. You
> >should update your code to use the new base version 4.x.
> >
> > Control/Monad/List.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/RWS/Lazy.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/RWS/Strict.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/Reader.hs:2:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/Reader/Class.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/State/Lazy.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/State/Strict.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/Writer.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/Writer/Class.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-}
> instead
> >
> > Control/Monad/Writer/Lazy.hs:1:11:
> > Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE
Re: [Haskell-cafe] Need Control.Monad.State
On 28 July 2010 13:17, michael rice wrote:
>
> See below. Lot's of warnings. Is the install OK? If so, can I use the same
> *import*?
Yeah, the install is OK. The meaning of the warnings are:
* "Warning: -fallow-undecidable-instances is deprecated:" this GHC
option has changed name, but the mtl package still uses the old name.
* "Warning: Module `Prelude' is deprecated:" mtl doesn't specify any
bounds on the version of the base library to be used (mainly because
of historic reasons when it wasn't changing much and the Haskell
community wasn't stressing versioning as much; note that the last
version of mtl was released almost 2 years ago). Because a lot of
packages broke when GHC-6.10.4 started shipping with base-4 (along
with base-3 for compatability purposes) due to the differences in how
exceptions were handled, if there is no upper bound on the version of
base to be used then cabal-install plays it safe and uses base-3.
However, the next version of GHC (6.14, which should be coming out
later this year) will not ship with base-3, so GHC-6.12 included that
warning message for people that kept trying to use base-3 that their
code won't work with 6.14.
So yes, now you can use "import Control.Monad.State".
>
> Michael
>
> --- On Tue, 7/27/10, Ivan Miljenovic wrote:
>
> >
> > If it isn't installed, you can use cabal-install to install it:
> >
> > cabal install mtl
> >
> > --
> > Ivan Lazar Miljenovic
> > ivan.miljeno...@gmail.com
> > IvanMiljenovic.wordpress.com
> >
>
>
> [mich...@localhost ~]$ cabal install mtl
> Resolving dependencies...
> Downloading mtl-1.1.0.2...
> Configuring mtl-1.1.0.2...
> Preprocessing library mtl-1.1.0.2...
> Building mtl-1.1.0.2...
> [ 1 of 21] Compiling Control.Monad.Identity ( Control/Monad/Identity.hs,
> dist/build/Control/Monad/Identity.o )
>
> Control/Monad/Cont.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Cont/Class.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Error.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Error/Class.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Identity.hs:1:0:
> Warning: Module `Prelude' is deprecated:
> You are using the old package `base' version 3.x.
> Future GHC versions will not support base version 3.x. You
> should update your code to use the new base version 4.x.
>
> Control/Monad/List.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/RWS/Lazy.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/RWS/Strict.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Reader.hs:2:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Reader/Class.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/State/Lazy.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/State/Strict.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Writer.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Writer/Class.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Writer/Lazy.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
>
> Control/Monad/Writer/Strict.hs:1:11:
> Warning: -fallow-undecidable-instances is deprecated: use
> -XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
> [ 2 of 21] Compiling Control.Monad.Writer.Class (
> Control/Monad/Writer/Class.hs, dist/build/Control/Monad/Writer/Class.o )
>
> Control/Mona
Re: [Haskell-cafe] Need Control.Monad.State
See below. Lot's of warnings. Is the install OK? If so, can I use the same
*import*?
Michael
--- On Tue, 7/27/10, Ivan Miljenovic wrote:
>
> If it isn't installed, you can use cabal-install to install it:
>
> cabal install mtl
>
> --
> Ivan Lazar Miljenovic
> ivan.miljeno...@gmail.com
> IvanMiljenovic.wordpress.com
>
[mich...@localhost ~]$ cabal install mtl
Resolving dependencies...
Downloading mtl-1.1.0.2...
Configuring mtl-1.1.0.2...
Preprocessing library mtl-1.1.0.2...
Building mtl-1.1.0.2...
[ 1 of 21] Compiling Control.Monad.Identity ( Control/Monad/Identity.hs,
dist/build/Control/Monad/Identity.o )
Control/Monad/Cont.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Cont/Class.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Error.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Error/Class.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Identity.hs:1:0:
Warning: Module `Prelude' is deprecated:
You are using the old package `base' version 3.x.
Future GHC versions will not support base version 3.x. You
should update your code to use the new base version 4.x.
Control/Monad/List.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/RWS/Lazy.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/RWS/Strict.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Reader.hs:2:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Reader/Class.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/State/Lazy.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/State/Strict.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Writer.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Writer/Class.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Writer/Lazy.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
Control/Monad/Writer/Strict.hs:1:11:
Warning: -fallow-undecidable-instances is deprecated: use
-XUndecidableInstances or pragma {-# LANGUAGE UndecidableInstances #-} instead
[ 2 of 21] Compiling Control.Monad.Writer.Class (
Control/Monad/Writer/Class.hs, dist/build/Control/Monad/Writer/Class.o )
Control/Monad/Writer/Class.hs:1:0:
Warning: Module `Prelude' is deprecated:
You are using the old package `base' version 3.x.
Future GHC versions will not support base version 3.x. You
should update your code to use the new base version 4.x.
[ 3 of 21] Compiling Control.Monad.Error.Class ( Control/Monad/Error/Class.hs,
dist/build/Control/Monad/Error/Class.o )
Control/Monad/Error/Class.hs:1:0:
Warning: Module `Prelude' is deprecated:
You are using the old package `base' version 3.x.
Future GHC versions will not support base version 3.x. You
should update your code to use the new base version 4.x.
[ 4 of 21] Compiling Control.Monad.State.Class ( Control/Monad/State/Class.hs,
dist/build/Control/Monad/State/Class.o )
Control/Monad/State/Class.hs:1:0:
Warning: Module `Prelude' is deprecated:
You are using the old package `base' version 3.x.
Future GHC versions will not support base version 3.x. You
should update your code to use the new base version 4.x.
[ 5 of 21] Compiling Control.Monad.Reader.Class (
Control/Monad/Reader/Class.hs, dist/build/Control/Monad/Reader/Class.o )
Control/Monad/Reader/Class.hs:1:0:
Warning: Module `Prelude' is deprecated:
Re: [Haskell-cafe] Need Control.Monad.State
On Wed, Jul 28, 2010 at 12:04 AM, Ivan Miljenovic wrote: > On 28 July 2010 13:03, michael rice wrote: >> >> [mich...@localhost ~]$ ghc-pkg list mtl >> /usr/lib/ghc-6.12.1/package.conf.d >> [mich...@localhost ~]$ >> >> Installed? > > No; if it was installed it would specify a version. For example: $ ghc-pkg list mtl /usr/lib64/ghc-6.12.3/package.conf.d mtl-1.1.0.2 -- Felipe. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Need Control.Monad.State
On 28 July 2010 13:03, michael rice wrote: > > [mich...@localhost ~]$ ghc-pkg list mtl > /usr/lib/ghc-6.12.1/package.conf.d > [mich...@localhost ~]$ > > Installed? No; if it was installed it would specify a version. > > Michael > > --- On Tue, 7/27/10, Ivan Miljenovic wrote: > > From: Ivan Miljenovic > Subject: Re: [Haskell-cafe] Need Control.Monad.State > To: "michael rice" > Cc: haskell-cafe@haskell.org > Date: Tuesday, July 27, 2010, 10:51 PM > > On 28 July 2010 12:39, michael rice wrote: > > > > How do I import Control.Monad.State? > > Install and use the mtl library (comes with the Haskell platform), > monads-fd (almost identical API to mtl; the point of this is that mtl > uses some extension: the non-extension bits are in the transformers > library and monads-fd extends transformers by using extensions to > implement mtl functionality) or monads-tf (a different approach to > what monads-fd does using different extensions). > > To check if you have mtl installed (substitute the other package names > if necessary): > > ghc-pkg list mtl > > If it isn't installed, you can use cabal-install to install it: > > cabal install mtl > > -- > Ivan Lazar Miljenovic > ivan.miljeno...@gmail.com > IvanMiljenovic.wordpress.com > -- Ivan Lazar Miljenovic ivan.miljeno...@gmail.com IvanMiljenovic.wordpress.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Need Control.Monad.State
[mich...@localhost ~]$ ghc-pkg list mtl /usr/lib/ghc-6.12.1/package.conf.d [mich...@localhost ~]$ Installed? Michael --- On Tue, 7/27/10, Ivan Miljenovic wrote: From: Ivan Miljenovic Subject: Re: [Haskell-cafe] Need Control.Monad.State To: "michael rice" Cc: haskell-cafe@haskell.org Date: Tuesday, July 27, 2010, 10:51 PM On 28 July 2010 12:39, michael rice wrote: > > How do I import Control.Monad.State? Install and use the mtl library (comes with the Haskell platform), monads-fd (almost identical API to mtl; the point of this is that mtl uses some extension: the non-extension bits are in the transformers library and monads-fd extends transformers by using extensions to implement mtl functionality) or monads-tf (a different approach to what monads-fd does using different extensions). To check if you have mtl installed (substitute the other package names if necessary): ghc-pkg list mtl If it isn't installed, you can use cabal-install to install it: cabal install mtl -- Ivan Lazar Miljenovic ivan.miljeno...@gmail.com IvanMiljenovic.wordpress.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Need Control.Monad.State
On 28 July 2010 12:39, michael rice wrote: > > How do I import Control.Monad.State? Install and use the mtl library (comes with the Haskell platform), monads-fd (almost identical API to mtl; the point of this is that mtl uses some extension: the non-extension bits are in the transformers library and monads-fd extends transformers by using extensions to implement mtl functionality) or monads-tf (a different approach to what monads-fd does using different extensions). To check if you have mtl installed (substitute the other package names if necessary): ghc-pkg list mtl If it isn't installed, you can use cabal-install to install it: cabal install mtl -- Ivan Lazar Miljenovic ivan.miljeno...@gmail.com IvanMiljenovic.wordpress.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Need Control.Monad.State
How do I import Control.Monad.State? I see this note in http://en.wikibooks.org/wiki/Haskell/Understanding_monads/State Note: in some package systems used for GHC, the Control.Monad.State module is in a separate package, usually indicated by MTL (Monad Transformer Library). Michael ===rand.hs == import Control.Monad.State type GeneratorState = State StdGen rollDie :: GeneratorState Int rollDie = do generator <- get let( value, newGenerator ) = randomR (1,6) generator put newGenerator return value === [mich...@localhost ~]$ ghci rand GHCi, version 6.12.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package ffi-1.0 ... linking ... done. rand.hs:1:7: Could not find module `Control.Monad.State': Use -v to see a list of the files searched for. Failed, modules loaded: none. Prelude> ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
