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Gofer is an interactive functional programming environment (i.e. an
interpreter) supporting a language based on the draft report for Haskell
version 1.2.

Gofer is intended as an experimental language, particularly where type classes
are involved.  Gofer extends the Haskell type class system in several ways.

The most significant features of Haskell not currently supported are:
modules, arrays, overloaded numeric constants, default declarations, derived
instances, contexts in datatype definitions.
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And just in case you wondered:

   The name "Gofer" is not a trademark, registered  or  otherwise,  and
   you are free to mention this name in published material, public  and
   private correspondence, or other documents  without  restriction  or
   obligation.
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WWW: http://web.cecs.pdx.edu/~mpj/goferarc/