[Haskell-cafe] Curious why "cabal upgrade parsec" not installing latest version

[Peter Schmitz]

Not that I'm having any problem with parsec 2.1.0.1, but I guess I
would like to install the latest (3.1.0), unless there is a reason
not to.

I can't seem to get Cabal to do so; thanks in advance for any help.

I don't understand part of the output from "cabal install --dry-run
--reinstall -v parsec" at the end below, which includes:
"selecting parsec-2.1.0.1 (hackage) and discarding parsec-2.0,
2.1.0.0, 3.0.0, 3.0.1 and 3.1.0".

(http://hackage.haskell.org/package/parsec seems to point to 3.1.0.)


Under Windows XP:

> H:\proc\dev\cmd>cabal update
> Downloading the latest package list from hackage.haskell.org
>
> H:\proc\dev\cmd>cabal info parsec
> * parsec           (library)
>     Synopsis:      Monadic parser combinators
>     Latest version available: 3.1.0
>     Latest version installed: 2.1.0.1
>     Homepage:      http://www.cs.uu.nl/~daan/parsec.html
>     Bug reports:   [ Not specified ]
>     Description:   Parsec is designed from scratch as an industrial-strength
>                    parser library. It is simple, safe, well documented (on the
>                    package homepage), has extensive libraries and good error
>                    messages, and is also fast. It is defined as a monad
>                    transformer that can be stacked on arbitrary monads, and it
>                    is also parametric in the input stream type.
>     Category:      Parsing
>     License:       BSD3
>     Author:        Daan Leijen <daan at microsoft.com>, Paolo Martini <paolo at nemail.it>
>     Maintainer:    Derek Elkins <derek.a.elkins at gmail.com>
>     Source repo:   [ Not specified ]
>     Flags:         base4
>     Dependencies:  mtl -any, bytestring -any, base >=4 && <5, syb -any,
>                    base >=3.0.3 && <4
>     Documentation: [ Not installed ]
>     Cached:        No
>     Modules:
>         Text.ParserCombinators.Parsec
>         Text.ParserCombinators.Parsec.Char
>         Text.ParserCombinators.Parsec.Combinator
>         Text.ParserCombinators.Parsec.Error
>         Text.ParserCombinators.Parsec.Expr
>         Text.ParserCombinators.Parsec.Language
>         Text.ParserCombinators.Parsec.Perm
>         Text.ParserCombinators.Parsec.Pos
>         Text.ParserCombinators.Parsec.Prim
>         Text.ParserCombinators.Parsec.Token
>
>
> H:\proc\dev\cmd>cabal upgrade parsec
> Resolving dependencies...
> No packages to be installed. All the requested packages are already installed.
> If you want to reinstall anyway then use the --reinstall flag.
>
>
> H:\proc\dev\cmd>cabal install  --dry-run  --reinstall  parsec
> Resolving dependencies...
> In order, the following would be installed (use -v for more details):
> parsec-2.1.0.1
>
>
> H:\proc\dev\cmd>cabal install  --dry-run  --reinstall -v  parsec
> H:\proc\tools\Haskell Platform\2010.1.0.0\bin\ghc.exe --numeric-version
> looking for package tool: ghc-pkg near compiler in
> H:\proc\tools\Haskell Platform\2010.1.0.0\bin
> found package tool in
> H:\proc\tools\Haskell Platform\2010.1.0.0\bin\ghc-pkg.exe
> H:\proc\tools\Haskell Platform\2010.1.0.0\bin\ghc-pkg.exe --version
> H:\proc\tools\Haskell Platform\2010.1.0.0\bin\ghc.exe --supported-languages
> Reading installed packages...
> H:\proc\tools\Haskell Platform\2010.1.0.0\bin\ghc-pkg.exe dump --global
> H:\proc\tools\Haskell Platform\2010.1.0.0\bin\ghc-pkg.exe dump --user
> Reading available packages...
> Resolving dependencies...
> selecting parsec-2.1.0.1 (hackage) and discarding parsec-2.0,
> 2.1.0.0, 3.0.0, 3.0.1 and 3.1.0
> selecting base-3.0.3.2 (installed) and 4.2.0.0 (installed) and discarding
> syb-0.1.0.0, 0.1.0.1, 0.1.0.2, 0.1.0.3, 0.2 and 0.2.1
> selecting ffi-1.0 (installed)
> selecting ghc-prim-0.2.0.0 (installed)
> selecting integer-gmp-0.2.0.0 (installed)
> selecting rts-1.0 (installed)
> selecting syb-0.1.0.2 (installed)
> In order, the following would be installed:
> parsec-2.1.0.1 (reinstall) changes: base-4.2.0.0 -> 3.0.3.2
>
> H:\proc\dev\cmd>

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