This is currently in-development vaporware.
Celerity is a programming language aiming for a good balance of productivity and scalability while being easily embeddable in host applications.
Celerity is expression-oriented, multi-paradigm, and features optional type checking. Some notable features are pattern matching, first-class functions with closures, opt-in mutability, explicit yet terse error propagation, concurrency based on lightweight agents, and non-suspending garbage collection.