Icon

Icon is a very high-level programming language based on the concept of "goal-directed execution" in which an expression in code returns "success" along with a result, or a "failure", indicating that there is no valid result. The success and failure of a given expression is used to direct further processing, whereas conventional languages would typically use Boolean logic written by the programmer to achieve the same ends. Because the logic for basic control structures is often implicit in Icon, common tasks can be completed with less explicit code.
Icon was designed by Ralph Griswold after leaving Bell Labs where he was a major contributor to the SNOBOL language.