Icon (programming language)

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.

Source: Wikipedia — Icon (programming language) (CC BY-SA 4.0)