Haskell Weekly News: March 20, 2006

Greetings, and thanks for reading issue 29 of HWN, a weekly newsletter covering developments in the Haskell community. Each Monday, new editions are posted to the Haskell mailing list and to The Haskell Sequence. RSS is also available.

Announcements

• lhs2TeX version 1.11. Andres Loeh announced lhs2TeX version 1.11, a preprocessor to generate LaTeX code from literate Haskell sources.

  lhs2TeX includes the following features:

  • Highly customized output.
  • Liberal parser -- no restriction to Haskell 98.
  • Generate multiple versions of a program or document from a single source.
  • Active documents: call Haskell to generate parts of the document (useful for papers on Haskell).
  • A manual explaining all the important aspects of lhs2TeX.

Haskell'

• Dropping implicit universal quantification
• Refine overlap handling for instance declarations
• Ranges and the Enum class
• Strict tuples
• Time library
• Associated types

Discussion

• Deep Functors. Oleg Kiselyov described an fmap over arbitrarily deep `collections': lists of maybes of maps of IOs, etc. -- arbitrarily nested fmappable things.

• GHC 6.4.2. Simon Marlow put out a heads up for the forthcoming 6.4.2 release of GHC. The rough timescale is to go into release candidate testing in about a week, and have two weeks of release candidates before the final release.

• Hexdump. Dominic Steinitz mentioned a "hexdump" function he'd written, posing a question about where it would live in the module hierarchy..

Quote of the Week

ihope :: My factorial function uses GADTs.

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