"This code recurs" or "this code is recursive". "This code is recurring" is correct, but not so idiomatic. But English is a living language, grammarians shoul

"This code recurs" or "this code is recursive". "This code is recurring" is correct, but not so idiomatic. But English is a living language, grammarians should be descriptive not prescriptive etc... "Recurse" (and "Recursing") is a perfectly good backformation, especially because it performs a useful function in distinguishing between two uses of the overloaded verb "to recur".