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Hugs 98 is a functional programming system based on Haskell 98, the de facto standard for non-strict functional programming languages. Hugs 98 provides an almost complete implementation of Haskell 98, including:

  • Lazy evaluation, higher order functions, and pattern matching.
  • A wide range of built-in types, from characters to bignums, and lists to functions, with comprehensive facilities for defining new datatypes and type synonyms.
  • An advanced polymorphic type system with type and constructor class overloading.
  • All of the features of the Haskell 98 expression and pattern syntax including lambda, case, conditional and let expressions, list comprehensions, do-notation, operator sections, and wildcard, irrefutable and `as' patterns.
  • An implementation of the Haskell 98 primitives for monadic I/O, with support for simple interactive programs, access to text files, handle-based I/O, and exception handling.
  • An almost complete implementation of the Haskell module system. Hugs 98 also supports a number of advanced and experimental extensions including multi-parameter classes, extensible records, rank-2 polymorphism, existentials, scoped type variables, and restricted type synonyms.


Use guide at


Download version 20051105 (stable)
released on 5 November 2005

VCS Checkout

passwd = cvs


Related Projects


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BSD 3ClauseTed Teah15 December 2005

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This entry (in part or in whole) was last reviewed on 4 January 2008.


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