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Library parsec
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.
http://hackage.haskell.org/cgi-bin/hackage-scripts/package/parsec
| HP Version | Shipped with |
| 2009.2.0 | parsec 2.1.0.1 |
| 2009.2.0.1 | parsec 2.1.0.1 |
3.0.0
2.1.0.1
Note that the 2009.2.0.x release of the Haskell Platform includes parsec version 2, not version 3.
Distributions may also package version 3 if they wish but if they package the platform they must also package version 2. It is not acceptable to package only version 3 while claiming support for the Haskell Platform.
Any decision to move to version 3 will go through the appropriate community discussion process. The intention is not to hold back progress but to get a consistent package collection for the community. If each distro makes its own choice then we get a mess and defeat one of the purposes of the platform.