Just added JSR-223 script engine for Jaskell (http://jaskell.codehaus.org/). Jaskell in author's words:
Jaskell is a functional scripting programming language that runs in JVM. The name "Jaskell" stands for Java-Haskell, Haskell being the famous pure functional programming language.
Jaskell is a lazy functional scripting language for Java. It features higher-order function, function currying, string interpolation, lazy evaluation, monad, dynamic typing, simple syntax and semantics etc.
As usual, engine source and binary are available at https://scripting.dev.java.net/