|FX-87 - Effects. A polymorphic language based on Scheme, allowing
side effects and first-class functions. It attempts to
integrate functional and imperative programming.
Expressions have types, side effects (e.g. reading, writing or
allocating) and regions (stating where the effects may occur).|
Versions: FX-89, FX-90.
["The FX-87 Reference Manual", D.K. Gifford