Common Lisp the Language, 2nd Edition

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# 26.12. Miscellaneous Features

The Loop Facility provides the `named` construct to name a loop so that the Common Lisp special form `return-from` can be used.

The loop keywords `initially` and `finally` designate loop constructs that cause expressions to be evaluated before and after the loop body, respectively.

The code for any `initially` clauses is collected into one `progn` in the order in which the clauses appeared in the loop. The collected code is executed once in the loop prologue after any implicit variable initializations.

The code for any `finally` clauses is collected into one `progn` in the order in which the clauses appeared in the loop. The collected code is executed once in the loop epilogue before any implicit values are returned from the accumulation clauses. Explicit returns in the loop body, however, will exit the loop without executing the epilogue code.

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