meaning of fx=y
1. 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. ftp://brokaw. lcs. mit. edu/. ["The FX-87 Reference Manual", D. K. Gifford