Question

The name of a de facto standard for this programming language includes a superscript over the word “Revised”, with the most recent 2013 version having a superscript of 7. The minimalist philosophy of this language has caused wildly diverging implementations (15[1])and led its steering committee to describe it as “the world's most unportable programming language”. This language includes a hygienic macro system via the “syntax-rules” statement, which is not shared by its closest relative. In this language, predicates end in question marks and mutating actions end in exclamation points. This is the direct predecessor of the (*) Racket programming (-5[1])language. This language has been widely used for introductory programming courses, (10[2])including at MIT and Berkeley until the 2010s. For 10 points, name this Lisp dialect, the primary competitor to Common Lisp whose name suggests a devious plan. ■END■ (10[1])

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