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| ANSI Common Lisp 6 Iteration 6.1 The LOOP Facility ### 6.1.9 Notes about Loop Types can be supplied for loop variables. It is not necessary to supply a type for any variable, but supplying the type can ensure that the variable has a correctly typed initial value, and it can also enable compiler optimizations (depending on the implementation). The clause `repeat` n ... is roughly equivalent to a clause such as
     (loop for internal-variable downfrom (- n 1) to 0 ...)
but in some implementations, the `repeat` construct might be more efficient. Within the executable parts of the loop clauses and around the entire loop form, variables can be bound by using let. Use caution when using a variable named `IT` (in any package) in connection with loop, since `it` is a loop keyword that can be used in place of a form in certain contexts. There is no standardized mechanism for users to add extensions to loop.

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