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Free programming system based on Haskell Hugs 98 is an interpreter and programming environment based on Haskell. You can use this application to develop Haskell programs. Here are some key features of "Hugs 98": · 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.

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