Goffin
<language> A {definitional constraint language} for
{declarative} parallel programming. Goffin systematically
integrates {equational constraints} and functions within a
uniform framework of {concurrent} programming.
Goffin is an embedding of a functional language kernel
({Haskell}) into a layer of constraint logic, which allows
{logical variables} inside functional expressions. In order
to preserve {referential transparency}, functional {reduction}
suspends until logical variables become bound.
Logical variables are bound by equational constraints, which
impose relations over expressions. Hence, constraints are the
means to structure the concurrent reduction of functional
expressions.
(1995-02-21)